U.S. patent application number 14/362278 was filed with the patent office on 2014-10-16 for sustained release preparation comprising insect pest-targeting gel composition.
This patent application is currently assigned to SHIN-ETSU CHEMICAL CO., LTD.. The applicant listed for this patent is SHIN-ETSU CHEMICAL CO., LTD.. Invention is credited to Takehiko Fukumoto, Ryuichi Saguchi.
Application Number | 20140308328 14/362278 |
Document ID | / |
Family ID | 48574340 |
Filed Date | 2014-10-16 |
United States Patent
Application |
20140308328 |
Kind Code |
A1 |
Saguchi; Ryuichi ; et
al. |
October 16, 2014 |
SUSTAINED RELEASE PREPARATION COMPRISING INSECT PEST-TARGETING GEL
COMPOSITION
Abstract
Provided is a sustained release preparation comprising an insect
pest-targeting gel composition, the preparation being free from
leakage or reaction of a volatile substance and being capable of
releasing the volatile substance at a constant rate. More
specifically, provided is a sustained release preparation including
a polymer tube having a sharp end and an insect pest-targeting gel
composition in the polymer tube, the composition including one or
more volatile substances and an oil gelling agent, wherein the
volatile substances are included in an amount of from 70.0 to 99.0%
by weight by the insect pest-targeting composition and are released
outside of the polymer tube through the polymer tube.
Inventors: |
Saguchi; Ryuichi;
(Joetsu-shi, JP) ; Fukumoto; Takehiko;
(Joetsu-shi, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SHIN-ETSU CHEMICAL CO., LTD. |
Tokyo |
|
JP |
|
|
Assignee: |
SHIN-ETSU CHEMICAL CO.,
LTD.
Tokyo
JP
|
Family ID: |
48574340 |
Appl. No.: |
14/362278 |
Filed: |
December 6, 2012 |
PCT Filed: |
December 6, 2012 |
PCT NO: |
PCT/JP2012/081628 |
371 Date: |
June 2, 2014 |
Current U.S.
Class: |
424/409 ;
424/84 |
Current CPC
Class: |
A01N 35/02 20130101;
A01N 25/04 20130101; A01N 43/90 20130101; A01N 25/18 20130101; A01N
31/02 20130101; A01N 25/34 20130101; A01N 37/06 20130101; A01N
25/18 20130101; A01N 27/00 20130101; A01N 35/02 20130101; A01N
37/02 20130101; A01N 43/90 20130101 |
Class at
Publication: |
424/409 ;
424/84 |
International
Class: |
A01N 25/04 20060101
A01N025/04; A01N 31/02 20060101 A01N031/02; A01N 25/34 20060101
A01N025/34 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 9, 2011 |
JP |
2011-270132 |
Claims
1. A sustained release preparation comprising: a polymer tube
having a sharp end and, an insect pest-targeting gel composition in
the polymer tube, the composition comprising one or more volatile
substances and an oil gelling agent, wherein said one or more
volatile substances are comprised in an amount of from 70.0 to
99.0% by weight by the insect pest-targeting gel composition and
are released outside of the polymer tube through the polymer
tube.
2. The sustained release preparation according to claim 1, wherein
said one or more volatile substances are selected from the group
consisting of a pheromone substance, an attractant and a
repellent.
3. The sustained release preparation according to claim 1, wherein
said oil gelling agent is selected from the group consisting of an
amino acid derivative, a long-chain fatty acid, a polyvalent metal
salt of a long chain fatty acid, a saccharide derivative and
wax.
4. The sustained release preparation according to claim 2, wherein
said oil gelling agent is selected from the group consisting of an
amino acid derivative, a long-chain fatty acid, a polyvalent metal
salt of a long chain fatty acid, a saccharide derivative and wax.
Description
TECHNICAL FIELD
[0001] The present invention relates to a sustained release
preparation comprising an insect pest-targeting gel composition,
particularly to a sustained release preparation comprising a
polymer tube having one sharp end.
BACKGROUND ART
[0002] Mating disruption, emergence forecasting, mass trapping and
the like can be accomplished by the sustained release of a
pheromone substance, an attractant or the like. As a method of
sustainably releasing a volatile substance which is effective for
insect pest control, over a long period of time, a method of
sustainably releasing a volatile substance in liquid form, a method
of sustainably releasing a volatile substance in gel form and other
methods are known. For example, Patent Document 1 discloses a
method comprising the steps of enclosing a volatile substance in a
polymer vessel and sustainably releasing it from the polymer
surface through the polymer wall; Patent Document 2 discloses a
method comprising the steps of forming a volatile substance into a
fluid gel and sustainably releasing the gel through a polymer film;
and Patent Document 3 discloses a method comprising the steps of
entrapping a volatile substance in a polymer lattice and
sustainably releasing it in a solid or gel form. In addition, when
a sustained release preparation having a volatile substance
enclosed therein is placed in a field, it is attached to a
suspending jig or attached to trees or shelves for plant
cultivation (Patent Document 4).
PRIOR ART DOCUMENTS
Patent Documents
[0003] [Patent Document 1] JP 07-313035A/1995 [0004] [Patent
Document 2] JP 2002-306584A [0005] [Patent Document 3] JP
64-055136A/1989 [0006] [Patent Document 4] JP 05-095751A
SUMMARY OF THE INVENTION
Problem to be Solved by the Invention
[0007] However, a preparation obtained by the method comprising the
step of enclosing a volatile substance in liquid form in a polymer
vessel as described in Patent Document 1 has a problem that holes
or cracks are caused in the vessel as a result of rude treatment by
users upon use and the volatile substance enclosed in the vessel
leaks from it so that the release period is markedly decreased. The
fluid gel described in Patent Document 2 also has a problem, in
addition to the possibility of leakage, that a large amount of
diluent has to be added to give fluidity so that the release rate
of the volatile substance is decreased as the time elapses.
Accordingly, there is a demand for the development of a sustained
release preparation which can release a volatile substance at a
constant rate without causing leakage of the volatile
substance.
[0008] The polymer gel described in Patent Document 3 has no
possibility of leakage of the volatile substance. However, since
the gel is produced by polymerization in the presence of a volatile
substance, the method cannot be applied to a volatile substance
having an instable functional group which may react under
polymerization conditions. Accordingly, there is a strong demand
for the development of a sustained release preparation in gel form
which can be produced without exposing the volatile substance to
severe conditions such as polymerization conditions.
[0009] In many fields for vegetables and like, branches, trees,
shelves, supports or the like for attaching sustained release
preparations thereto are not available so that supports have to be
prepared and installed separately from the preparations. However,
installment of the supports or the like brings not only disturbance
to the field work but also unfavorable cost increase. In this case,
direct scattering or direct placement of the sustained release
preparations on the ground without installment of the supports or
the like can be considered, but is not effective. It is because
when the preparations come in contact with the soil, a volatile
substance released from them is adsorbed to the soil. Accordingly,
with respect to crops such as vegetables, there is a demand for the
development of sustained release preparations not requiring
installment of the supports or the like and not coming in contact
with the soil.
[0010] With the foregoing in view, an object of the invention is to
provide a sustained release preparation comprising an insect
pest-targeting gel composition, which preparation is free from
leakage or reaction of one or more volatile substances, does not
come in contact with the soil even without installment of a stake
or the like, and a sustained release rate of the one or more
volatile substances is kept constant.
Solution to the Problem
[0011] In order to achieve the above-mentioned object, the present
inventors have studied a sustained release preparation comprising
an insect pest-targeting gel composition, which preparation can
sustainably and stably release a volatile substance effective for
insect pest control at a given or faster rate over a long period of
time. As a result, it has been unexpectedly found that the
above-mentioned object is achieved by producing a sustained release
preparation comprising a polymer tube having a sharp end and an
insect pest-targeting gel composition in the polymer tube, the
composition comprising one or more volatile substances and an oil
gelling agent, wherein the volatile substances are comprised in an
amount of from 70.0 to 99.0% by weight by the insect pest-targeting
gel composition and is released outside of the polymer tube through
the wall of the polymer tube. Thus, the invention has been
completed.
Effect of the Invention
[0012] According to the invention, the sustained release
preparation comprising an insect pest-targeting gel composition can
reduce the possibility of leakage of a volatile substance and
suppress a loss of the volatile substance due to the reaction at
the time of gelling because the volatile substance is gelled under
mild conditions. In addition, the sustained release preparation
does not contain a diluent component such as a solvent so that the
release at a given or faster rate can be maintained stably for a
long period of time. Furthermore, the release rate can be
regulated, depending on the material, thickness or the like of the
polymer tube. Even a volatile substance having high volatility and
therefore not suited for use in conventional sustained release
preparations can be released stably when used in the sustained
release preparation of the invention. In addition, the sustained
release preparation of the invention can be easily placed in the
field. It is only necessary to insert the sharp end of the
sustained release preparation into the surface of the ground of the
field.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] FIG. 1 shows one example of a sustained release preparation
having one sharp end and the other open end;
[0014] FIG. 2 shows one example of a sustained release preparation
having one sharp end and the other sealed end;
[0015] FIG. 3 shows another example of a sustained release
preparation having one sharp end and the other sealed end;
[0016] FIG. 4 is a graph showing the relationship between a
pheromone residual ratio and a release rate in Example 1; and
[0017] FIG. 5 is a graph showing the relationship between a
pheromone residual ratio and a release rate in Example 2.
EMBODIMENTS FOR CARRYING OUT THE INVENTION
[0018] The sustained release preparation of the invention comprises
a polymer tube having a sharp end and an insect pest-targeting gel
composition in the polymer tube, the composition comprising one or
more volatile substances and an oil gelling agent. As a material of
the polymer tube, a material which can release a volatile substance
from the polymer tube to the outside through the wall of the
polymer tube is used. Examples of the volatile substance to be used
in the invention include a pheromone substance, an attractant, a
repellent and a mixture thereof.
[0019] Examples of the pheromone substance to be used in the
invention include a linear aliphatic aldehyde having from 12 to 20
carbon atoms, a linear aliphatic acetate having from 12 to 20
carbon atoms which is saturated or has one or more double bonds, a
linear aliphatic alcohol having from 7 to 20 carbon atoms, a
spiroacetal having from 7 to 15 carbon atoms, a linear aliphatic
ketone having from 10 to 25 carbon atoms, an aliphatic hydrocarbon
having from 10 to 30 carbon atoms, and a carboxylic acid having
from 10 to 20 carbon atoms. Of these examples, a linear aliphatic
aldehyde having from 12 to 20 carbon atoms, a linear aliphatic
acetate having from 12 to 20 carbon atoms which is saturated or has
one or more double bonds, a linear aliphatic alcohol having from 7
to 20 carbon atoms and a spiroacetal having from 7 to 15 carbon
atoms are particularly preferred. Specific examples include
Z7Z11-hexadecadienyl acetate and Z7E11-hexadecadienyl acetate which
are the sex pheromone substances of the pink bollworm (Pectinophora
gossypiella); Z-8-dodecenyl acetate which is the sex pheromone
substance of the oriental fruit moth (Grapholita molesta);
E-5-decenyl acetate which is the sex pheromone substance of the
peach twig borer (Anarsia lineatella); Z-9-dodecenyl acetate which
is the sex pheromone substance of the grape berry moth (Eupoecilia
ambiguella); E7Z9-dodecadienyl acetate which is the sex pheromone
substance of the European grape vine moth (Lobesia botrana);
E-11-tetradecenyl acetate which is the sex pheromone substance of
the light brown apple moth (Epiphyas postvittana);
E8E10-dodecadienol which is the sex pheromone substance of the
codling moth (Cydia pomonella); Z-11-tetradecenyl acetate which is
the sex pheromone substance of the leaf roller (Tortricidae);
Z3--Z13-octadecadienyl acetate and E3Z13-octadecadienyl acetate
which are the sex pheromone substances of the peach tree borer
(Synanthedon exitiosa); Z11-hexadecenal which is the sex pheromone
substance of the American bollworm (Helicoverpa armigera);
Z9-hexadecenal which is the pheromone substance of the oriental
tobacco bud worm (Heliothis assulta); E8E10-dodecadienyl acetate
which is the sex pheromone substance of the soybean pod borer
(Leguminivora glycinivorella); Z-11-hexadecenyl acetate and
Z-11-hexadecenal which are the sex pheromone substances of the
diamondback moth (Plutella xylostella); Z-11-hexadecenyl acetate,
Z-11-hexdecenol and n-hexadecyl acetate which are the sex pheromone
substances of the cabbage armyworm (Mamestra brassicae);
Z9E12-tetradecadienyl acetate and Z-9-tetradecenol which are the
sex pheromone substances of the beat armyworm (Spodoptera exigua);
Z9E11-tetradecadienyl acetate and Z9E12-tetradecadienyl acetate
which are the sex pheromone substances of the common cutworm
(Spodoptera litura); Z-9-tetradecenyl acetate which is the sex
pheromone substance of the fall armyworm (Spodoptera frugiperda);
E-4-tridecenyl acetate which is the sex pheromone substance of the
tomato pinworm (Keiferia lycopersicella); Z-11-hexadecenal and
Z-13-octadecenal which are the sex pheromone substances of the rice
stem borer (Scirpophaga incertulas); 5,9-dimethylpentadecane and
5,9-dimethylhexadecane which are the sex pheromone substance of the
coffee leaf miner (Leucoptera coffeella); 14-methyl-1-octadecene
which is the sex pheromone substance of the peach leaf miner
(Lyonetia clerkella L.); Z-13-icosen-10-one which is the sex
pheromone substance of peach fruit moth (Carposina sasakii);
7,8-epoxy-2-methyloctadecane which is the sex pheromone substance
of the gypsy moth (Lymantria dispar dispar); Z-13-hexadecen-1-nyl
acetate which is the sex pheromone substance of the pine
processionary moth (Thaumetopoea pityocampa); 2-butanol which is
the sex pheromone substance of the white grub beetle (Dasylepida
ishigaidensis); Z-7,15-hexadecadien-4-olide which is the sex
pheromone substance of the yellowish elongate chafer (Heptophylla
picea); n-dodecyl acetate which is the sex pheromone substance of
the sugarcane wireworm (Melanotus oldnawensis); E-9,11-dodecadienyl
butyrate and E-9,11-dodecadienyl hexanate which are the sex
pheromone substances of the sugarcane wireworm (Melanotus
saldshimensis); (R)--Z-5-(oct-1-enyl)-oxacyclopentan-2-one which is
the sex pheromone substance of the cupreous chafer (Anomala
cuprea); hexyl hexanoate, E-2-hexenyl hexanoate and octyl butyrate
which are the sex pheromone substances of the rice leaf bug
(Trigonotylus caelestialium); hexyl butyrate, E-2-hexenyl butyrate
and E-4-oxo-2-hexenal which are the sex pheromone substances of the
sorghum plant bug (Stenotus ntbrovittatus);
(6R)--Z-3,9-dimethyl-6-isopropenyl-3,9-decadienyl propionate and
(6R)--Z-3,9-dimethyl-6-isopropenyl-3,9-decadienol which are the sex
pheromone substances of the white peach scale (Pseudaulacaspis
pentagona); (S)-5-methyl-2-(1-propen-2-yl)-4-hexenyl
3-methyl-2-butenoate which is the sex pheromone substance of the
vine mealybug (Planococcus ficus); Z-9-tricosene which is the sex
pheromone substance of the housefly (Musca domestica); gentisyl
quinone isovalerate which is the sex pheromone of the German
cockroach (Blattella germanica); and 1,7-dioxaspiro[5.5]undecane
which is the sex pheromone substance of the olive fruit fly
(Bactrocera oleae).
[0020] Other examples of the pheromone substance to be used in the
invention include a linear aliphatic aldehyde having from 12 to 20
carbon atoms, a linear aliphatic acetate having from 12 to 20
carbon atoms which is saturated or has one or more double bonds, a
linear aliphatic alcohol having from 7 to 20 carbon atoms, a
spiroacetal having from 7 to 15 carbon atoms, a linear aliphatic
ketone having from 10 to 25 carbon atoms, an aliphatic hydrocarbon
having from 10 to 30 carbon atoms and a carboxylic acid having from
10 to 20 carbon atoms, other than those exemplified above.
[0021] Specific examples of the linear aliphatic aldehyde having
from 10 to 20 carbon atoms include Z-5-decenal, 10-undecenal,
n-dodecanal, Z-9-dodecenal, E5Z10-dodecadienal, E8E10-dodecadienal,
n-tetradecanal, Z7-tetradecenal, Z9-tetradecenal, Z11-tetradecenal,
Z9E11-tetradecadienal, Z9Z11-tetradecadienal,
Z9E12-tetradecadienal, Z9E11,13-tetradecatrienol, Z10-pentadecenal,
E9Z11-pentadecadienal, n-hexadecanal, Z7-hexadecenal,
E6Z11-hexadecadienal, E4Z6-hexadecadienal, E4E6Z
11-hexadecatrienal, E 10E12E14-hexadecatrienal, n-octadecanal,
Z9-octadecenal, E14-octadecenal, E2Z13-octadecadienal,
Z3Z13-octadecadienal, Z9Z12-octadecadienal, and
Z9Z12Z15-octadecatrienal.
[0022] Specific examples of the linear aliphatic acetate having
from 12 to 20 carbon atoms which is saturated or has a double bond
include decyl acetate, Z3-decenyl acetate, Z4-decenyl acetate,
undecyl acetate, Z7-undecenyl acetate, Z8-undecenyl acetate,
E9-undecenyl acetate, dodecyl acetate, E7-dodecenyl acetate,
Z7-dodecenyl acetate, E8-dodecenyl acetate, E9-dodecenyl acetate,
11-dodecenyl acetate, 10-methyldodecenyl acetate, tridecyl acetate,
Z4-tridecenyl acetate, E6-tridecenyl acetate, E8-tridecenyl
acetate, Z8-tridecenyl acetate, tetradecyl acetate, Z7-tetradecenyl
acetate, E8-tetradecenyl acetate, Z8-tetradecenyl acetate,
E9-tetradecenyl acetate, Z9-tetradecenyl acetate, E10-tetradecenyl
acetate, Z10-tetradecenyl acetate, E12-tetradecenyl acetate,
Z12-tetradecenyl acetate, 12-methyltetradecenyl acetate, pentadecyl
acetate, Z8-pentadecenyl acetate, E9-pentadecenyl acetate,
hexadecyl acetate, Z3-hexadecenyl acetate, Z5-hexadecenyl acetate,
E6-hexadecenyl acetate, Z7-hexadecenyl acetate, Z9-hexadecenyl
acetate, Z10-hexadecenyl acetate, Z12-hexadecenyl acetate,
heptadecyl acetate, Z11-heptadecenyl acetate, octadecyl acetate,
E2-octadecenyl acetate, Z11-octadecenyl acetate, and
E13-octadecenyl acetate.
[0023] Specific examples of the linear aliphatic acetate having
from 12 to 20 carbon atoms and having two or more double bonds
include a conjugated diene-based and/or 1,4-pentadiene-based
acetate such as Z3E5-decadienyl acetate, Z3E5-dodecadienyl acetate,
E3Z5-dodecadienyl acetate, E4Z10-dodecadienyl acetate,
Z5E7-dodecadienyl acetate, E5Z7-dodecadienyl acetate,
Z8Z10-dodecadienyl acetate, 9,11-dodecadienyl acetate,
E4Z7-tridecadienyl acetate, 11-methyl-Z9,12-tridecadienyl acetate,
E3E5-tetradecadienyl acetate, E8E10-tetradecadienyl acetate,
Z10Z12-tetradecadienyl acetate, Z10E12-tetradecadienyl acetate,
E10Z12-tetradecadienyl acetate, E10E12-tetradecadienyl acetate,
E11,13-tetradecadienyl acetate, Z8Z10-pentadecadienyl acetate,
Z8E10-pentadecadienyl acetate, Z8Z10-hexadecadienyl acetate,
Z10E12-hexadecadienyl acetate, Z11Z13-hexadecadienyl acetate,
Z11E13-hexadecadienyl acetate, E11Z13-hexadecadienyl acetate, and
Z11E14-hexadecadienyl acetate.
[0024] Specific examples of the linear aliphatic alcohol having
from 7 to 20 carbon atoms include a saturated linear aliphatic
alcohol and a linear aliphatic alcohol having one or more double
bonds such as n-heptanol, Z4-heptenol, Z6-nonenol, Z6,8-nonadienol,
E6,8-nonadienol, n-decanol, Z5-decenol, E5-decenol, n-undecanol,
undecenol, 11-chloro-E8E10-undecadienol, n-dodecanol, Z5-dodecenol,
Z7-dodecenol, E7-dodecenol, Z8-dodecenol, E8-dodecenol,
Z9-dodecenol, E9-dodecenol, E10-dodecenol, 11-dodecenol,
Z5E7-dodecadienol, E5Z7-dodecadienol, E5E7-dodecadienol,
Z7Z9-dodecadienol, Z7E9-dodecadienol, E7Z9-dodecadienol,
8,9-difluoro-E8E10-dodecadienol, 10,11-difloro-E8E10-dodecadienol,
8,9,10,11-tetrafluoro-E8E10-dodecadienol, Z9,11-dodecadienol, E9,
E11-dodecadienol, n-tridecanol, n-tetradecanol, Z5-tetradecenol,
E5-tetradecenol, Z7-tetradecenol, Z8-tetradecenol,
Z11-tetradecenol, E11-tetradecenol, Z9Z11-tetradecadienol,
Z9E11-tetradecadienol, Z9Z12-tetradecadienol,
Z9E12-tetradecadienol, Z10Z12-tetradecadienol,
E10E12-tetradecadienol, n-pentadecanol,
6,10,14-trimethyl-2-pentadecanol, n-hexadecanol, Z9-hexadecenol,
Z11-hexadecenol, E11-hexadecenol, Z7Z11-hexadecadienol,
Z7E11-hexadecadienol, E10Z12-hexadecadienol, E10E12-hexadecadienol,
Z11Z13-hexadecadienol, Z11E13-hexadecadienol,
E11Z13-hexadecadienol, E11Z13-hexadecadienol,
E4Z6Z10-hexadecatrienol, E4E6Z10-hexadecatrienol, n-octadecanol,
Z13-octadecenol, E2Z13-octadecadienol, Z3 Z13-octadecadienol,
E3Z13-octadecadienol and n-eicosanol.
[0025] Specific examples of the spiroacetal having from 7 to 15
carbon atoms include 1,6-dioxaspiro[4.5]decane,
2-ethyl-1,6-dioxaspiro[4.4]nonane,
3-hydroxy-1,7-dioxaspiro[5.5]undecane,
4-hydroxy-1,7-dioxaspiro[5.5]undecane,
7-methyl-1,6-dioxaspiro[4.5]decane,
2-methyl-1,6-dioxaspiro[4.5]decane,
2,7-dimethyl-1,6-dioxaspiro[4.4]nonane,
2,4,8-trimethyl-1,7-dioxaspiro[5.5]undecane,
2-methyl-1,7-dioxaspiro[5.5]undecane, 1,7-dioxaspiro[5.6]dodecane,
2,8-dimethyl-1,7-dioxaspiro[5.5]undecane,
2,2,8-trimethyl-1,7-dioxaspiro[5.5]undecane,
2-ethyl-1,7-dioxaspiro[5.5]undecane,
2-methyl-1,7-dioxaspiro[5.6]dodecane,
2-ethyl-7-methyl-1,6-dioxaspiro[5.6]decane,
7-ethyl-2-methyl-1,6-dioxaspiro[5.6]decane,
2,7-diethyl-1,6-dioxaspiro[4.4]nonane,
2,7-dimethyl-1,6-dioxaspiro[4.6]undecane,
2-methyl-7-propyl-1,6-dioxaspiro[4.4]nonane,
3-hydroxy-2,8-dimethyl-1,7-dioxaspiro[5.5]undecane,
2-propyl-1,7-dioxaspiro[5.5]undecane,
2-ethyl-8-methyl-1,7-dioxaspiro[5.5]undecane,
8-ethyl-2-methyl-1,7-dioxaspiro[5.5]undecane,
2,7-diethyl-1,6-dioxaspiro[4.5]decane,
2,7-dipropyl-1,6-dioxaspiro[4.4]nonane,
7-butyl-2-methyl-1,6-dioxaspiro[4.5]decane,
8-methyl-2-propyl-1,7-dioxaspiro[5.5]undecane, and
2-propyl-8-methyl-1,7-dioxaspiro[5.5]undecane.
[0026] Specific examples of the linear aliphatic ketone having from
10 to 25 carbon atoms include heptadecan-2-one,
Z12-nonadecen-9-one, Z6Z9-nonadecadien-3-one, Z13-icosen-10-one,
Z6-heneicosen-1'-one, Z6-heneicosen-9-one,
Z6E8-heneicosadien-11-one, Z6E9-heneicosadien-11-one,
Z6Z9-heneicosadien-11-one, and Z7-tricosen-11-one.
[0027] Specific examples of the aliphatic hydrocarbon having from
10 to 30 carbon atoms include 1E11-pentadecadiene,
1Z11-pentadecadiene, 5,9-dimethylpentadecane, 2-methylhexadecane,
3,13-dimethylhexadecane, 5,9-dimethylhexadecane, n-heptadecane,
2-methylheptadecane, 2,5-dimethylheptadecane, 5-methylheptadecane,
5,11-dimethylheptadecane, 7-methylheptadecane,
7,11-dimethylheptadecane, Z3Z6Z9-heptadecatriene,
Z6Z9-heptadecadiene, Z7-octadecene, 10,14-dimethyl-1-octadecene,
5,9-dimethyloctadecane, 2-methyloctadecane, 14-methyloctadecane,
Z3Z6Z9-octadecatriene, n-nonadecane, 2-methylnonadecane,
9-methylnonadecane, Z3Z6Z9Z11-nonadecatetraene,
1E3Z6Z9-nonadecatetraene, Z3Z6Z9-nonadecatriene,
Z6Z9-nonadecadiene, Z9-nonadecene, n-eicosane, Z9-eicosene,
Z3Z6-eicosadiene, Z3Z6Z9-eicosatriene, 1Z3Z6Z9-eicosatetraene,
1Z3Z6Z9-heneicosatetraene, n-heneicosane, Z3Z6-heneicosadiene,
Z6Z9-heneicosadiene, Z6Z9,20-heneicosatriene,
Z3Z6Z9-heneicosatriene, Z6-13-methylheneicosene, Z9-heneicosene,
n-docosaene, Z3Z6Z9-docosatriene, Z6Z9-docosadiene, n-tricosane,
Z7-tricosene, Z3Z6Z9-tricosatriene, Z6Z9-tricosadiene,
n-tetracosane, n-pentacosane, Z3Z6Z9-pentacosatriene, n-hexacosane,
n-heptacosane, n-octacosane, and n-nonacosane.
[0028] Specific examples of the carboxylic acid having from 10 to
20 carbon atoms are not particularly limited insofar they contain a
carboxyl group. Examples include carboxylic acids having, in the
carbon skeleton thereof, two or more methyl groups, one or more
double bond or the like, such as 3,5-dimethyldodecanoeic acid,
Z-5-undecenoic acid, E-5-undecenoic acid, and
(E,Z)-3,5-tetradecadienoic acid.
[0029] Specific examples of the attractant include an aliphatic
carboxylic acid such as formic acid, acetic acid, propionic acid,
n-butyric acid, isobutyric acid, n-valeric acid, isovaleric acid,
caproic acid, isocaproic acid, E2-butenoic acid, 2-hydroxypropionic
acid and malonic acid; an aliphatic aldehyde such as acetaldehyde,
propanal, pentanal and E2-hexanal; an aliphatic ketone such as
2-butanone, pentane-2,4-dione and cyclohexanone; an aliphatic
carboxylate ester such as ethyl lactate, ethyl acetate, isoamyl
acetate, Z3-hexenyl acetate, decyl acetate, hexyl 2-methylbutyrate,
butyl hexanoate, ethyl octanoate, ethyl nonanoate, ethyl decanoate,
ethyl undecanoate, ethyl dodecanoate, ethyl myristate, ethyl
palmitate, ethyl E2Z4-decadienoate, tert-butyl
2-methyl-4-cyclohexenecarboxylate and tert-butyl 4(or
5)-chloro-2-methyl-cyclohexanecarboxylate; an aliphatic alcohol
such as ethanol, isobutyl alcohol, isopentyl alcohol,
2-ethylhexanol, Z3-hexenol, 1-octen-3-ol, nonanol, decanol,
cyclohexanol, acetoin and propane 1,2-diol; an aliphatic ether such
as diethyl ether and acetal; an aliphatic hydrocarbon such as
.alpha.,.beta.-ionone, undecane, tridecane, hexadecane, heptadecane
and Z9-tricosene; an aromatic compound such as methyl
phenylacetate, ethyl phenylacetate, propyl phenylacetate, phenetyl
phenylacetate, Z3-hexenyl benzoate, eugenol, methyl isoeugenol,
methyl eugenol, veratric acid, 2-allyloxy-3-ethoxybenzaldehyde,
4-(p-acetoxyphenyl)-2-butanone, 4-(p-hydroxyphenyl)-2-butanone
(Raspberry ketone), anisylacetone, methyl anthranilate, ethyl
anthranilate, benzyl salicylate, methyl salicylate, phenethyl
alcohol, phenethyl propionate, phenethyl butyrate, anethole,
vanillin, ethyl vanillin, isovanillin, heliotropin, piperonal
acetone and phthiocol; a heterocyclic compound such as maltol,
ethyl maltol, 2,5-dimethylpyrazine,
.gamma.-(4-pentenyl)-.gamma.-butyrolactone, .delta.-nonyllactone
and frontalin; a sulfur-containing compound such as dimethyl
disulfide, dimethyl trisulfide, dipropyl disulfide, methyl
isothiocyanate and 3-butenyl isothiocyanate; a nitrogen-containing
compound such as trimethylamine, hexylamine, 1,4-diaminobutane,
allylnitrile and methyl 2-amino-3-methylvalerate; and a terpene
compound such as geraniol, farnesol, linalool, linalool oxide,
citronellol, cineol, geranyl acetate, citronellyl acetate, citral,
carvone, d-limonene, .beta.-pinene, farnesene and
4,8-dimethyl-1,E3,7-nonatriene.
[0030] Other specific examples of the attractant include an
essential oil such as angelica oil, citronella oil and mustard oil;
and an extract from a plant such as aloe and eucalyptus.
[0031] Specific examples of the repellent include an aliphatic
carboxylic acid such as Z9Z12-octadienoic acid and
3,7,11-trimethyl-6,10-dodecadinoic acid; an aliphatic aldehyde such
as E2-hexenal, Z2E6-3,7-dimethyloctadienal, 3,7-dimethyl-6-octenal
and E2Z6-nonadienal; an aliphatic ketone such as 2-heptanone,
2-dodecanone, 2-tridecanone, 3-methyl-2-cyclohexenone,
E3E5-octadien-2-one and E3Z7-decadien-2-one; an aliphatic
carboxylate ester such as butyl acetate, octyl acetate, methyl
myristate, methyl palmitate and methyl
6-n-pentylcyclonexene-1-carboxylate; an aliphatic alcohol such as
octanol, 1-octen-3-ol, 2-ethyl-1,3-hexanediol, menthol and
n-hexyltriethylene glycol monoether; an aliphatic hydrocarbon such
as tridecane; an aromatic compound such as cinnamic alcohol,
cinnamic aldehyde, methyleugenol, phenyl acetaldehyde,
benzaldehyde, anethole, diethyltoluamide,
N,N-diethyl-3-methylbenzamide (DEET), dimethyl phthalate, dioctyl
phthalate and naphthalene; a heterocyclic compound such as
.gamma.-nonyllactone, butyl
3,4-dihydro-2,2-dimethyl-4-oxo-2H-pyran-6-carboxylate, furfural and
4-octanoyl morpholine; a sulfur-containing compound such as propyl
isothiocyanate; a nitrogen-containing compound such as methyl
piperidine, 2,6-dimethylpiperidine and 2-ethylpiperidine; and a
terpene compound such as geraniol, cineol, linalool, terpineol,
citral, citronellal, neryl formate, .alpha.-pinene, carvone,
d-limonene and camphor.
[0032] Additional examples may include an essential oil such as
rose geranium oil, sandalwood oil, pepper oil (peppermint oil) and
lemongrass oil; and an extract from a plant such as cinnamon,
camphor, clover, thyme, geranium, bergamot, laurel, pine,
Gaultheria adenothrix, pennyroyal, eucalyptus and neem tree.
[0033] The oil gelling agent to be used in the invention has, in
the molecule thereof, at least one polar functional group capable
of forming an intermolecular hydrogen bond such as a carboxyl
group, a hydroxyl group, an ester group or an amide group, so that
the intermolecular hydrogen bonds are present through the polar
functional group. When the oil gelling agent is dissolved uniformly
in the volatile substance by heating (preferably at from 60 to
150.degree. C.), the intermolecular hydrogen bonds of the oil
gelling agent are cut temporarily, but are formed again by cooling
(including cooling by being left standing). Since a large amount of
the volatile substance exists around the molecules of the oil
gelling agent, the oil gelling agent forms the intermolecular
hydrogen bonds again while incorporating therein the volatile
substance. Only weak interaction such as Van der Waals force works
between the volatile substance and the molecules of the oil gelling
agent so that the volatility of the volatile substance even after
gelling is almost the same as that before gelling.
[0034] Specific examples of the oil gelling agent include an amino
acid derivative, a long-chain fatty acid, a polyvalent metal salt
of a long-chain fatty acid, a sugar derivative and wax. Of these
examples, an amino acid derivative and a long-chain fatty acid are
particularly preferred.
[0035] Specifically preferred examples of the amino acid derivative
include an amino-acylated and carboxyl-esterified or
carboxyl-amidated derivative of an amino acid having from 2 to 15
carbon atoms, such as di(cholesteryl/behenyl/octyldodecyl)
N-lauroyl-L-glutamate, di(cholesteryl/octyldodecyl)
N-lauroyl-L-glutamate, di(phytosteryl/behenyl/octyldodecyl)
N-lauroyl-L-glutamate, di(phytosterylloctyldodecyl)
N-lauroyl-L-glutamate, N-lauroyl-L-glutamic acid dibutylamide, and
N-ethylhexanoyl-L-glutamic acid dibutylamide. Of these examples,
N-lauroyl-L-glutamic acid dibutylamide and
N-ethylhexanoyl-L-glutamic acid dibutylamide are particularly
preferred.
[0036] Specific examples of the long-chain fatty acid include a
saturated or unsaturated fatty acid having from 8 to 24 carbon
atoms, and an analog of a long-chain fatty acid such as
12-hydroxystearic acid. Specific examples of the saturated fatty
acid include octanoic acid, 2-ethylhexanoic acid, decanoic acid,
lauric acid, myristic acid, stearic acid, palmitic acid, arachidic
acid and behenic acid. Specific examples of the unsaturated fatty
acid include palmitoleic acid, oleic acid, vaccenic acid, linoleic
acid, linolenic acid, arachidonic acid, icosadienoic acid and
erucic acid.
[0037] Specific examples of the metal salt of a long-chain fatty
acid include a metal salt of the long-chain fatty acid described
above and a metal salt of a saturated fatty acid, for example,
having a carbon chain of 18 carbon atoms such as aluminum stearate,
magnesium stearate, manganese stearate, iron stearate, cobalt
stearate, calcium stearate and lead stearate.
[0038] Specific examples of the saccharide derivative include a
dextrin fatty acid ester such as dextrin laurate, dextrin
myristate, dextrin palmitate, dextrin margarate, dextrin stearate,
dextrin arachidate, dextrin lignocerate, dextrin cerotate, dextrin
2-ethylhexanoate palmitate and dextrin palmitate stearate; a
sucrose fatty acid ester such as sucrose palmitate, sucrose
stearate and sucrose acetate/stearate; a fructooligosaccharide
fatty acid ester such as fructooligosaccharide stearate and
fructooligosaccharide 2-etylhexanoate; and a benzylidene derivative
of sorbitol such as monobenzylidene sorbitol and dibenzylidene
sorbitol.
[0039] Specific examples of the wax include haze wax (Japan wax
derived from Rhus succedanea seeds; main component: triglyceride of
palmitic acid), urushi wax (Japan wax derived from Rhus
verniciflua; main component: glyceride palmitate), carnauba wax
(myricyl cerotate and myricyl alcohol), sugarcane wax (myricyl
palmitate), palm wax (myricyl palmitate), beeswax (cerotic acid and
myricyl palmitate), whale wax (cetyl palmitate), wool wax (ceryl
alcohol and/or myristic acid) and paraffin wax (linear
hydrocarbon).
[0040] A critical gelling concentration at which a volatile
substance gels differs, depending on the structure of a polar
functional group, the strength of hydrogen bonds and an asymmetric
structure of the oil gelling agent. The strength of hydrogen bonds
of the oil gelling agent is sometimes weakened by the coordination
of the functional group (polar group) and a non-polar group of the
volatile substance. The critical gelling concentration differs,
depending on the chemical structure of the volatile substance and
the kind of the gelling agent. In consideration of the release
performance and cost, the gel composition is charged in the polymer
tube desirably at a concentration near the critical gelling
concentration. More specifically, the insect pest-targeting gel
composition comprises therein from 70.0 to 99.0% by weight,
preferably from 85.0 to 99.0% by weight, still more preferably from
90.0 to 99.0% by weight of the volatile substance. When the amount
of the volatile substance in the insect pest-targeting gel
composition is less than 70.0% by weight, the active ingredient of
the volatile substance is enclosed in the gel so that the volatile
substance cannot be released stably, thereby making it impossible
to achieve long-term and constant sustained-release. In addition,
it may increase the cost. When the volatile substance in the insect
pest-targeting gel composition exceeds 99.0% by weight, the insect
pest-targeting gel composition having fluidity only can be
obtained.
[0041] For example, when Z11-tetradecenyl acetate, which is the
pheromone substance of a leaf roller, is used as the volatile
substance and stearic acid is used as the oil gelling agent, the
resulting insect pest-targeting gel composition comprises
preferably from 90 to 99% by weight of Z11-tetradecenyl acetate.
When E8E10-dodecadienol, which is the pheromone substance of the
codling moth, is used as the volatile substance and stearic acid is
used as the oil gelling agent, the resulting insect pest-targeting
gel composition comprises preferably from 70 to 80% by weight of
E8E10-dodecadienol. When E8E10-dodecadienol is used as the volatile
substance and N-lauroyl-L-glutamic acid dibutylamide is used as the
oil gelling agent, the resulting insect pest-targeting gel
composition comprises preferably from 90 to 97% by weight of
E8E10-dodecadienol.
[0042] In the conventional gel composition, it is the common
practice to dilute the gel composition with a solvent or the like
to form a fluid gel in order to avoid a problem that the surface of
the insect pest-targeting gel composition is dried to enclose the
active ingredient of the volatile substance in the gel. However,
when the gel contains a solvent or the like, it is difficult to
obtain a stable release rate because due to the volatility of the
solvent, the concentration of the volatile substance in the gel
composition changes along with the sustained release. Moreover,
this dilution causes problems such as necessity of measures against
liquid leakage and unnecessary increase in volume. With the
foregoing in view, as described above, the sustained release
preparation in the invention comprises, in a polymer tube thereof,
an insect pest-targeting gel composition comprising a volatile
substance and an oil gelling agent, wherein the volatile substance
is comprised in an amount of from 70.0 to 99.0% by weight by the
insect pest-targeting gel composition.
[0043] The insect pest-targeting gel composition of the invention
does not require measures against liquid leakage because it is a
non-fluid gel comprising, in addition to the volatile substance,
substantially only the oil gelling agent and an optional additive
which will be described later. Furthermore, it does not cause the
unnecessary volume increase because it does not comprise a solvent
or the like. Moreover, the volatile substance in the insect
pest-targeting gel composition is released to the surroundings and
the gelling agent which has contributed to the gelling of the
sustainably released volatile substance remains on the gel surface
in powder form so that the concentration of the volatile substance
in the insect pest-targeting gel composition becomes substantially
constant throughout the release period, making it possible to
achieve a stable release rate.
[0044] Thus, the insect pest-targeting gel composition of the
invention is in non-fluid form, can be stored for a long period of
time, and fluidization of the insect pest-targeting gel composition
does not occur insofar as it is stored at normal temperature.
[0045] The insect pest-targeting gel composition may comprise an
additive. The examples of the additive include an antioxidant such
as a synthetic antioxidant, e.g., BHT (butylhydroxytoluene), BHA
(butylhydroxyanisole), ethyl protocatechuate, isoamyl gallate and
propyl gallate, and a natural antioxidant, e.g., NDGA
(nordihydroguaiaretic acid) and guaiac gum; and a ultraviolet
absorber such as a para-aminobenzoic acid-based one, e.g., octyl
para-dimethylaminobenzoate, a benzophenone derivative such as
oxybenzone (2-hydroxy-4-methoxy-benzophenone) and
2-hydroxy-4-octoxybenzophenone, a methoxycinnamic acid derivative
and a salicylic acid derivative. The content of each additive in
the insect pest-targeting gel composition is preferably from 0.01
to 5% by weight and the total content of them is preferably from
0.02 to 10% by weight.
[0046] The insect pest-targeting gel composition can be obtained by
heating the volatile substance, the oil gelling agent and an
optional additive preferably at about 60 to 150.degree. C. for
dissolution, and then cooling the resulting solution. The cooling
is preferably cooling by being left standing.
[0047] According to the invention, a polymer tube (polymer tube) is
used as a vessel into which the insect pest-targeting gel
composition is introduced. The polymer tube is not particularly
limited insofar as it uses a material of permitting penetration,
transmission and/or diffusion of one or more volatile substances
therethrough and allowing the one or more volatile substances be
released (for example, evaporated) from the outer surface of the
tube. Specific examples of the material include a thermoplastic
polymer such as low-density polyethylene, high-density
polyethylene, polypropylene, ethylene-propylene copolymers,
ethylene vinyl acetate copolymers, ethylene acrylate ester-based
copolymers, polyvinyl acetate, polyvinyl chloride-based resins,
polymethyl methacrylate, polyvinyl alcohol, polyvinylidene
chloride, polybutylene, methyl methacrylate-styrene copolymers,
methylpentene resins, ionomers, polyacetal, cellulose acetate,
cellulose acetate butyrate, polyvinylidene fluoride, and silicon
resins. Examples of a biodegradable polymer include condensation
polymers between at least one dicarboxylic acid selected from the
group consisting of oxalic acid, malonic acid, succinic acid,
glutaric acid, adipic acid, sebacic acid, fumaric acid and maleic
acid, and at least one polyol selected from the group consisting of
ethylene glycol, propylene glycol, butanediol, pentanediol,
hexanediol, octanediol and decanediol; condensation polymers of at
least one monomer selected from group consisting of lactic acid,
hydroxyvaleric acid, hydroxycaproic acid and hydroxycapric acid;
and an aliphatic polyester-based thermoplastic polymer such as
polycaprolactone obtained by ring-opening polymerization of
s-caprolactone. To these polymer materials, a lubricant, a
plasticizer, a stabilizer, a pigment or a filler may be added to
improve their processability.
[0048] The polymer tube may be sealed at either one end or both
ends thereof, or may be open with an opening portion at either one
end or both ends thereof. It is preferable to seal the tube at both
ends in order to prevent a reaction such as oxidation or hydrolysis
which will otherwise occur due to direct contact between the
volatile substance and an outside environment.
[0049] The release rate of the volatile substance can be regulated
by the material or thickness of the polymer tube. It can also be
regulated by the presence or absence of the opening portion, but a
ratio of the opening portion relative to the total area of the thin
tube including the side surface of the tube from which the
substance is released is small so that regulation of the release
rate by the presence or absence of the opening portion is
limited.
[0050] The polymer tube having one sharp end has preferably an
inner diameter of from 0.5 to 15 mm, a thickness of from 0.2 to 1.5
mm, and a length of from 10 to 5,000 mm. The tube includes an
ampule. The polymer tube having one sharp end includes a polymer
tube having a sharp jig attached to one end of the tube, and a
polymer tube having one sharp end of the tube itself.
[0051] The sharp jig may be attached to one end of the polymer tube
by inserting the sharp jig into the inside of one end portion of
the polymer tube or inserting one end portion of the polymer tube
into the inside of the sharp jig.
[0052] The material of the sharp jig is preferably the same type of
polymer material as the polymer material of the polymer tube,
bamboo, wood, or the like. The material should have enough strength
to avoid breaking when inserted in the soil of the field. Moreover,
both the polymer tube and the sharp jig are preferably made of a
biodegradable material because they can be subjected to plowing
together with the soil in the field after use.
[0053] The sharp jig is required to be long enough to prevent the
sustained release preparation inserted in the soil from falling
down or turning over. The length is preferably from 20 to 300 mm.
When the sharp jig has a length of less than 20 mm, a portion of
the preparation may come in contact with the soil when it is
inserted in the soil. As a result, one or more volatile substances
may be adsorbed to the soil. When the sharp jig has a length of
more than 300 mm, the preparation may fall down or turn over and
disturb the farm work such as pesticide spraying.
[0054] The amount of the insect pest-targeting composition to be
introduced into each polymer tube is preferably from 10 mg/tube to
6 g/tube, though it varies, depending on the kind of the volatile
substance, a period of application or the like.
[0055] The tubes each filled with the insect pest-targeting gel
composition are installed in a field preferably at from 20 tubes/ha
to 100,000 tubes/ha, though it may vary, depending on a target
insect pest.
[0056] Examples of a method for producing the sustained release
preparation of the invention include a method comprising the steps
of forming a polymer tube material with one sharp end and then
introducing a gel composition solution into the material; a method
comprising the steps of forming a polymer tube material, while
introducing a gel composition solution comprising one or more
volatile substances and an oil gelling agent into the material, and
then attaching an sharp jig to one end of the material; and a
method comprising the steps of forming a polymer tube material,
introducing a gel composition solution into the material, and then
attaching a sharp jig to one end of the material.
[0057] Examples of the method of comprising the steps of forming a
polymer tube material, while introducing a gel composition solution
therein include a method comprising the step of continuously
forming, for example, by extrusion, an infinitely-long polymer tube
material having a prepared gel composition filled. More
specifically, a molten polymer is continuously extruded into a
tubular form through a die to form a polymer tube material, while
the polymer tube material is continuously filled with a prepared
gel composition solution comprising one or more volatile substances
and an oil gelling agent through a hole provided in the mandrel of
the die. An elongated polymer tube material produced is taken up on
a reel. The resulting elongated polymer tube material is cut into
pieces of an appropriate length, or welded by a hot press and cut
at intervals of an appropriate length. As a result, a polymer tube
having both open ends or having one or both sealed ends can be
obtained. Then, a sharp jig is attached to one end of the resulting
polymer tube by hot welding or the like to obtain a sustained
release preparation.
[0058] On the other hand, examples of the method comprising the
steps of forming a polymer tube material and then introducing a gel
composition solution therein include a method comprising the steps
of continuously forming an elongated polymer tube material, for
example, by extrusion, and then dividing the material into portions
with required lengths, and then filling each portion with the
prepared gel composition solution by pressure application or
suction. After the gel composition solution becomes solidified, the
polymer tube material portion is cut, or sealed and cut into a
desired length. As a result, a polymer tube having both open ends
or having one or both sealed ends can be obtained. Then, a sharp
jig is attached in the same manner as in the above to obtain a
sustained release preparation.
[0059] An example of a sustained release preparation comprising a
polymer tube having one sharp end and the other open end is shown
in FIG. 1. A sustained release preparation 10 in FIG. 1 comprises a
tube 11 having both open ends 11a and 11b and a pest-targeting gel
composition 12 in the tube 11. One or more volatile substances
penetrate and/or diffuse through a wall of the tube and are
released from the outer surface of the sustained release
preparation 10 to the outside space. A sharp jig 13 is inserted
into the inside of the one end portion 11a of the tube 11.
[0060] An example of a sustained release preparation comprising a
polymer tube having one sharp end and the other sealed end is shown
in FIG. 2. A sustained release preparation 20 in FIG. 2 comprises a
tube 21 having both sealed ends and a pest-targeting gel
composition 22 in the tube 21. One or more volatile substances
penetrate and/or diffuse through a wall of the tube and are
released from the outer surface of the sustained release
preparation 20 to the outside space. The one end 21a of the tube 21
is inserted into the inside of one end portion of a sharp jig
23.
[0061] Another example of a sustained release preparation
comprising a polymer tube having one sharp end and the other sealed
end is shown in FIG. 3. A sustained release preparation 30 in FIG.
3 is produced as one integrated body by extrusion, comprises a tube
31 having one end 31a extending along a longitudinal direction of
the preparation 30 to form a sharp end portion 33 and having one
open end 31b, and a pest-targeting gel composition 32 in the tube
31. One or more volatile substances penetrate and/or diffuse
through a wall of the tube and are released from the outer surface
of the sustained release preparation 30 to the outside space.
Another end 31b of the tube 31 is open.
EXAMPLES
[0062] The invention will be explained based on Examples. However,
it should not be construed that the invention is limited to
Examples.
Example 1
[0063] Simultaneously with extrusion of a polymer tube material
made of an ethylene/vinyl acetate copolymer (having a vinyl acetate
content of 4% by weight) and having an inner diameter of 1.2 mm and
a film thickness of 0.50 mm, the tube material was filled with a
uniform solution prepared by adding dextrin myristate to
E8E10-dodecadienol at the weight ratio of 10:90 and heating the
resulting mixture to a temperature of 80.degree. C. Thus,
simultaneous extrusion and filling were carried out. It was
confirmed as a result of observing the inside of the polymer tube
material that the solution gelled in non-fluid form at room
temperature. This polymer tube material was cut into a 200-mm
piece. Then, an sharp jig made of bamboo and having an outer
diameter of 1.2 mm and a length of 12 cm was inserted into the
inside of the one end portion of the tube piece to obtain a
sustained release preparation.
[0064] The sustained release preparations thus obtained were
allowed to stand under the conditions of 25.degree. C. and a wind
speed of 0.7 m/sec to release the volatile substance therefrom. A
decrease in the weight was measured with the elapsed time so that a
release rate of E8E10-dodecadienol was determined. The results are
shown in FIG. 4.
[0065] As shown in FIG. 4, the resulting sustained release
preparations released E8E10-dodecadienol for long a long period of
time and E8E10-dodecadienol did not leak out by way of fluidization
during the release period.
Example 2
[0066] A polymer tube material made of a polybutylene
adipate/polybutylene succinate copolymer having an inner diameter
of 1.4 mm and a film thickness of 0.60 nm was produced by
extrusion. The 2-butanol, the sex pheromone substance of the white
grub beetle, was subject to addition of N-ethylhexanoyl-L-glutamic
acid dibutylamide at the weight ratio of 90:10, followed by heating
under stirring. The resulting solution became uniform at 60.degree.
C. After further heating to 80.degree. C., the resulting solution
was introduced into the polymer tube material by suction. The tube
material thus obtained was then allowed to stand at room
temperature for 2 hours. It was confirmed as a result of observing
the inside of the polymer tube material that the solution gelled in
non-fluid form at room temperature. The polymer tube material was
cut into a 30-mm piece and a polymer tube having both sealed ends
was produced. Then, a sharp jig made of polylactic acid and having
an outer diameter of 1.4 mm and a length of 50 mm was inserted into
the inside of the one end portion of the tube piece and attached by
hot welding to obtain a sustained release preparation.
[0067] The sustained release preparation thus obtained was allowed
to stand under the conditions of 25.degree. C. and a wind speed of
0.7 msec to release the volatile substance therefrom. A decrease in
the weight was measured with the elapsed time so that a release
rate of 2-butanol was determined. The results are shown in FIG.
5.
[0068] As shown in FIG. 5, the resulting sustained release
preparation released 2-butanol for long a long period of time and
2-butanol did not leak out by way of fluidization during the
release period.
EXPLANATION OF SYMBOLS
[0069] 10, 20, 30: sustained release preparation [0070] 11, 21, 31:
tube [0071] 11a, 11b, 21a, 31a, 31b: end portion of tube [0072] 12,
22, 32: insect pest-targeting gel composition [0073] 13, 23: sharp
jig [0074] 33: sharp end portion of tube
* * * * *