U.S. patent application number 09/756251 was filed with the patent office on 2001-07-26 for foam control agents.
Invention is credited to Hoogland, Jan, Sawicki, George.
Application Number | 20010009896 09/756251 |
Document ID | / |
Family ID | 9883832 |
Filed Date | 2001-07-26 |
United States Patent
Application |
20010009896 |
Kind Code |
A1 |
Hoogland, Jan ; et
al. |
July 26, 2001 |
Foam control agents
Abstract
The foam control efficiency of a silicone antifoam in liquid or
powder detergent formulations is improved by the use as an additive
of an olefinically unsaturated alcohol, for example oleyl
alcohol.
Inventors: |
Hoogland, Jan; (Brussels,
BE) ; Sawicki, George; (Vale of Glamorgan,
GB) |
Correspondence
Address: |
Lewis F. Gould, Jr., Esquire
DUANE, MORRIS & HECKSCHER LLP
One Liberty Place
Philadelphia
PA
19103-7396
US
|
Family ID: |
9883832 |
Appl. No.: |
09/756251 |
Filed: |
January 8, 2001 |
Current U.S.
Class: |
510/466 |
Current CPC
Class: |
C11D 3/2031 20130101;
B01D 19/0404 20130101; C11D 3/373 20130101; B01D 19/0409 20130101;
B01D 19/0404 20130101; C11D 3/0026 20130101 |
Class at
Publication: |
510/466 |
International
Class: |
C11D 001/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 14, 2000 |
GB |
0001021.5 |
Claims
That which is claimed is:
1. A foam control agent for addition to a detergent composition
comprising a silicone antifoam and an olefinically unsaturated
alcohol.
2. A foam control agent according to claim 1 wherein the
olefinically unsaturated alcohol has the formula R--OH where R
denotes an alkenyl group having 10 to 22 carbon atoms.
3. A foam control agent according to claim 2 wherein the
olefinically unsaturated alcohol is oleyl alcohol.
4. A foam control agent according to claim 1 wherein the silicone
antifoam comprises a liquid trimethylsiloxy end-blocked
polydimethylsiloxane.
5. A foam control agent according to claim 4 wherein the liquid
polydimethylsiloxane is a branched polydimethylsiloxane.
6. A foam control agent according to claim 1 wherein the silicone
antifoam comprises an organopolysiloxane material having at least
one silicon-bonded substituent of the formula X-Ph, wherein X
denotes a divalent aliphatic organic group bonded to silicon
through a carbon atom present in X and Ph denotes an aromatic
group.
7. A foam control agent according to claim 1 wherein the silicone
antifoam contains a branched siloxane resin.
8. A foam control agent according to claim 1 wherein the silicone
antifoam contains a hydrophobic filler.
9. A foam control agent according to claim 1 wherein the weight
ratio of olefinically unsaturated alcohol to silicone antifoam is
from 100:1 to 5:1.
10. A foam control agent according to claim 1 which is in the form
of an oil-in-water emulsion.
11. A foam control agent according to claim 1 which is in the form
of particles, said particles comprising the silicone and the
unsaturated alcohol on a support.
12. A detergent composition comprising at least one active
detergent selected from anionic, cationic, nonionic and amphoteric
surfactants, wherein the composition contains a foam control agent
according to claim 1.
13. A detergent composition according to claim 12 which is in the
form of a detergent powder formulation, wherein the composition
contains a foam control agent in the form of particles according to
claim 9.
14. A detergent composition comprising at least one active
detergent selected from anionic, cationic, nonionic and amphoteric
surfactants, wherein the composition contains a silicone foam
control agent and an olefinically unsaturated alcohol.
Description
FIELD OF THE INVENTION
[0001] This invention relates to a foam control agent for detergent
compositions, particularly a foam control agent comprising a
silicone antifoam.
BACKGROUND OF THE INVENTION
[0002] Detergent compositions used, for example in washing
applications, contain surfactants which promote the production of
foam during a washing process. The amount of foam produced when
detergent compositions are agitated, as found during a washing
process, can be excessive which can have detrimental effect upon
the cleaning efficiency of the detergent composition. It is
therefore desirable to control the amount of foam generated and
generally foam control agents are added to the detergent
composition for this purpose.
[0003] Silicone antifoams are known in the art, for example in U.S.
Pat. No. 5,968,889 and EP 709451. U.S. Pat. No. 5,668,095 describes
a suds suppressing system for detergent compositions which
comprises a mixture of a silicone oil with a 2-alkyl alcanol. U.S.
Pat. No. 4,806,266 describes a particulate foam control agent in
finely divided form for inclusion in a detergent composition in
powder form, the agent comprising 1 part by weight of a silicone
antifoam and not less than 1 part by weight of an organic material
which is a fatty acid or a fatty alcohol having a carbon chain
containing from 12 to 20 carbon atoms and a melting point in the
range 45 to 80.degree. C. and being insoluble in water. U.S. Pat.
No. 5,238,596 describes particulate foam control agents for powder
detergents comprising silicone antifoam with at least 30% by weight
water insoluble 12-20C fatty acid or fatty alcohol and melting
point in the range 45-80.degree. C. or a monoester of glycerol and
a fatty acid having a melting point in the range 50-85.degree. C.,
and a native starch carrier material. U.S. Pat. No.4,824,593
describes an antifoam agent in the form of a polysiloxane in a
fatty acid matrix.
[0004] U.S. Pat. No. 3,329,625 describes a defoaming cleaning cake,
for use in a floor cleaning device, comprising a wax-like material
of melting point 40-100.degree. C., a polyalkylene oxide emulsifier
and suspended particles of polydimethylsiloxane.
[0005] There is a trend in the detergents industry towards
compositions containing more high foaming surfactants. There is
therefore a need to provide an improved foam control agent suitable
for use in detergent compositions which avoids the need for higher
concentrations of silicone antifoams with the high foaming
surfactants.
SUMMARY OF THE INVENTION
[0006] We have found according to the invention that the use of
unsaturated alcohols in combination with silicone antifoams
enhances the ability of silicone antifoams to control foam
formation.
[0007] According to the invention there is provided a foam control
agent comprising a silicone antifoam and an olefinically
unsaturated alcohol.
DETAILED DESCRIPTION OF THE INVENTION
[0008] The silicone used in the foam control agent of the present
invention is generally a liquid organopolysiloxane polymer and can
be any of those suggested for use in silicone antifoams, for
example as described in EP 578424. The polymers can be linear or
branched having a structure according to the general formula (I).
1
[0009] In formula (I), R" denotes a monovalent hydrocarbon group
having from 1 to 35 carbon atoms, preferably 1 to 8 carbon atoms.
The groups R" may be the same or different. R1 denotes a group R",
a hydroxyl group or a group according to the general formula (II).
2
[0010] wherein R2 denotes a divalent hydrocarbon, hydrocarbonoxy,
siloxane group or oxygen and Y denotes a group R" or a hydroxyl
group, a, b and c have a value of 0 or an integer, provided at
least one of a and b is an integer and the total of a+b+c has a
value such that the viscosity of the organopolysiloxane polymer at
25.degree. C. is at least 50 mm.sup.2/s, preferably at least 500
mm.sup.2/S. In the case where the organopolysiloxane polymers are
linear, R1 denotes R" or a hydroxyl group. It is preferred for the
linear organopolysiloxanes that Y denotes a group R" and that b=
0.
[0011] Preferred polymers include those wherein at least 60 or even
80% of all R" groups denote an alkyl group having from 1 to 4
carbon atoms, most preferably methyl. The organopolysiloxane may be
a trimethylsiloxy end-blocked polydimethylsiloxane, a
polydiethylsiloxane or a methylphenylpolysiloxane, or may contain
alkyl groups having 9 to 35 carbon atoms as described in U.S. Pat.
No. 5,486,306. The organopolysiloxane can alternatively comprise an
organopolysiloxane material having at least one silicon-bonded
substituent of the formula X-Ph, wherein X denotes a divalent
aliphatic organic group bonded to silicon through a carbon atom and
Ph denotes an aromatic group as described in U.S. application Ser.
No. 09/636,799, for example 2-phenylethyl or 2-phenylpropyl groups
formed by reaction of styrene or alpha-methylstyrene with a Si--H
group. The preferred viscosity of the organopolysiloxanes is from
500 to 100,000 mm.sup.2/s and more preferably 1000 to 60,000
mm.sup.2/s at 25.degree. C.
[0012] Preferably the liquid organopolysiloxanes are branched or
higher viscosity siloxanes (i.e. above 12,500 mm.sup.2/s at
25.degree. C.). In the case where the organopolysiloxanes have
branching in the siloxane chain, the polymers preferably have a
structure according to Formula (I), wherein b has a value of at
least 1 and R2 is preferably a divalent siloxane group or an oxygen
atom. Preferred siloxane groups R2 can be formed by reaction of a
siloxane resin with a polydiorganosiloxane polymer as described in
U.S. Pat. No. 4,396,524. Branched siloxanes and methods of making
them are described in a number of patent specifications, e.g.
EP217501 and U.S. Pat. No. 5,055,229.
[0013] The silicone antifoam can additionally comprise a filler.
Suitable fillers are described in many publications, for example
U.S. Pat. No. 4,072,621. The fillers are generally finely divided
particulate materials and include silica, fumed TiO2, Al2O3, zinc
oxide, magnesium oxide, silicone resins, for example, alkylated
silicone resins, salts of aliphatic carboxylic acids, reaction
products of isocyanates with certain materials e.g.
cyclohexylamine, alkyl amides, for example, ethylene or methylene
bis stearamide.
[0014] The most preferred fillers are silica particles with a
surface area of at least 50 m.sup.2/g as measured by BET. Suitable
silica particles may be made according to any of the standard
manufacturing techniques, for example, thermal decomposition of a
silicon halide, decomposition and precipitation of a metal salt of
silicic acid, e.g. sodium silicate and a gel formation method.
Suitable silicas for use in the silicone antifoams include fumed
silica, precipitated silica and gel formation silica. The average
particle size of the fillers preferably range from 0.1 to 20
micrometers, more preferably 0.25 to 10 micrometers and most
preferably 0.5 to 5 micrometers.
[0015] Preferably the surface of the filler is rendered
hydrophobic, and this can be effected by treatment of the filler
particles with treating agents, e.g. reactive silanes or siloxanes,
for example, dimethyldichlorosilane, trimethylchlorosilane,
hexamethyldisilazane, hydroxyl end-blocked and methyl end-blocked
polydimethylsiloxanes, siloxane resins, fatty acids or a mixture of
one or more of these. Fillers which have already been treated with
such compounds are commercially available from many companies, e.g.
from Degussa. The surface of the filler may be rendered hydrophobic
prior to the addition of the filler to the organopolysiloxane.
Alternatively the filler surface may be rendered hydrophobic in
situ, i.e. after the filler has been dispersed in the liquid
organopolysiloxane component. This may be effected by adding to the
liquid organopolysiloxane prior to, during or after the dispersion
of the filler therein, the appropriate amount of treating agent of
the kind described above either in the presence of a catalyst
and/or heating the mixture to a temperature above 40.degree. C. The
filler is preferably present at 1 to 20 or 25% by weight of the
antifoam, most preferably from 2 to 8%.
[0016] The silicone antifoam may additionally contain a siloxane
resin, for example a resin consisting of monovalent
trihydrocarbonsiloxy (M) groups of the formula R3SiO1/2 and
tetrafunctional (Q) groups SiO4/2 wherein R denotes a monovalent
hydrocarbon group as described in U.S. Pat. No. 5,693,256. The
siloxane resin is preferably a solid resin and can be present as an
insoluble filler or may be wholly or partially soluble in the
liquid organopolysiloxane.
[0017] The olefinically unsaturated alcohol used in the foam
control agent of the invention can in general be any unsaturated
alcohol having a boiling point above 100.degree. C. and is
preferably a primary alcohol of the general formula R--OH where R
represents an alkenyl group having from 10 to 22 carbon atoms. The
olefinically unsaturated alcohol is most preferably oleyl alcohol
(9-octadecen-1-ol) which is readily available and inexpensive.
Palmitoleyl alcohol (9-hexadecen-1-ol), eicosen-1-ol and dodecenyl
alcohol (a mixture of unsaturated C12-14 alcohols) are also
available commercially and are suitable for use in the foam control
agent of the invention.
[0018] The ratio of unsaturated alcohol to silicone antifoam to be
employed in the foam control agent of the invention will depend on
a number of factors, for example, on the nature of the silicone
antifoam and on the amount of foam control required. The weight
ratio of unsaturated alcohol to silicone antifoam is generally in
the range of from 2500:1 to 0.05:1, preferably from 500:1 to 0.5:1
and most preferably from 100:1 to 5:1.
[0019] A foam control agent according to the invention using a
combination of silicone antifoam and olefinically unsaturated
alcohol gives enhanced foam control performance compared with the
foam control performance of the individual components of the agent.
The use of a foam control agent according to the invention can
therefore enable the reduction of the level of silicone antifoam
required to achieve a required level of foam reduction. For example
the incorporation of oleyl alcohol at 1.0% by weight of a detergent
composition can enable a fivefold reduction in the amount of the
more expensive silicone antifoam material required to achieve foam
control.
[0020] The foam control agent of the invention can be used in
various detergent compositions such as detergent powder
formulations used for machine washing and in liquid detergent
compositions, for example concentrated liquid detergent
compositions and aqueous or non-aqueous liquid detergent
compositions.
[0021] The foam control agent of the invention may be a simple
mixture of the above ingredients or they can be incorporated in
alternative ways. They can for example be in the form of an
emulsion, preferably an oil in water emulsion, or in particulate
form, for example particles comprising the silicone and the
unsaturated alcohol on a particulate support.
[0022] Emulsions may be made according to any of the known
techniques, and may be macro-emulsions or micro-emulsions. In
general, they comprise the foam control agent as the oil phase, one
or more surfactants, water and standard additives, such as
preservatives, viscosity modifiers, protective colloids and/or
thickeners. The surfactants may be selected from anionic, cationic,
nonionic or amphoteric materials. Mixtures of one or more of these
may also be used. Suitable anionic organic surfactants include
alkali metal soaps of higher fatty acids, alkyl aryl sulphonates,
for example sodium dodecyl benzene sulphonate, long chain (fatty)
alcohol sulphates, olefin sulphates and sulphonates, sulphated
monoglycerides, sulphated esters, sulphonated ethoxylated alcohols,
sulphosuccinates, alkane sulphonates, phosphate esters, alkyl
isethionates, alkyl taurates and/or alkyl sarcosinates. Suitable
cationic organic surfactants include alkylamine salts, quaternary
ammonium salts, sulphonium salts and phosphonium salts. Suitable
nonionic surfactants include silicones, particularly siloxane
polyoxyalkylene copolymers, condensates of ethylene oxide with a
long chain (fatty) alcohol or (fatty) acid, for example C.sub.14-15
alcohol, condensed with 7 moles of ethylene oxide (Dobanol.RTM.
45-7), condensates of ethylene oxide with an amine or an amide,
condensation products of ethylene and propylene oxides, esters of
glycerol, sucrose or sorbitol, fatty acid alkylol amides, sucrose
esters, fluoro-surfactants and fatty amine oxides. Suitable
amphoteric organic detergent surfactants include imidazoline
compounds, alkylaminoacid salts and betaines. It is more preferred
that the organic surfactants are nonionic or anionic materials. Of
particular interest are surfactants which are environmentally
acceptable. The concentration of foam control agent in an emulsion
may vary according to applications, required viscosity,
effectiveness of the foam control agent and addition system, and
ranges on average from 5 to 80% by weight, preferably 10 to 40%. A
foam control emulsion may also contain a stabilising agent such as
a silicone glycol copolymer or a crosslinked organopolysiloxane
polymer having at least one polyoxyalkylene group, as described in
EP663225.
[0023] Alternatively the foam control agent can be provided as a
water-dispersible composition in which the silicone antifoam is
dispersed in a water-dispersible carrier such as a silicone glycol
or in another water-miscible liquid such as ethylene glycol,
propylene glycol, polypropylene glycol, polyethylene glycol, a
copolymer of ethylene and propylene glycols, a condensate of a
polyalkylene glycol with a polyol, an alkyl polyglycoside, an
alcohol alkoxylate or an alkylphenol alkoxylate or in a mineral oil
as described in U.S. Pat. No. 5,908,891.
[0024] A particulate foam control agent can be a free flowing
powder which is particularly suitable for incorporation in a
detergent powder formulation. An appropriate particulate support
can comprise any suitable solid material but conveniently may be an
ingredient or component part of a detergent composition. As well as
providing the foam control agent in a suitable physical form, the
carrier bulks up the supported foam control agent to facilitate the
dispersability of the supported foam control agent in powdered
detergent. Even distribution of the supported foam control agent in
the detergent composition is important since it is desirable that
every unit-measure of the detergent composition used contains
sufficient foam control agent to stop excessive foam formation even
though the foam control agent may be employed at levels below 1% by
weight of the total detergent composition. Preferably the carrier
is a water soluble powder which facilitates dispersion of the foam
control agent in aqueous liquor during the wash cycle. It is most
suitable to choose support particles or granules which themselves
play an active role in the laundering or washing process. Examples
of such materials are sodium sulphate, sodium carbonate, sodium
citrate, sodium tripolyphosphate and clay minerals. Such materials
are useful as for example, builders, soil suspenders, diluents
and/or softeners in the detergent composition.
[0025] The support may be a solid on which the foam control agent
is deposited during manufacture. Alternatively the support
particles can be combined with premixed foam control agent.
Particulate foam control agents can alternatively be formed by
granulation, spray drying, emulsification followed by drying or
extrusion and comminution.
[0026] The components of the foam control agent are preferably
combined prior to addition to the detergent composition as
described above, but alternatively the individual components of the
agent can be added directly to the detergent composition. The
components of both the detergent and foam control agent may be
mixed together during the manufacture of the detergent composition
without the need of pre-mixing of either the detergent or foam
control agent.
[0027] Thus according to another aspect of the invention a
detergent composition containing a silicone foam control agent is
characterised in that the composition additionally contains an
olefinically unsaturated alcohol.
[0028] The detergent composition generally comprises at least one
surfactant of the anionic, cationic, non-ionic or amphoteric type
or mixtures thereof, at least one organic and/or inorganic builder
salt and optionally other additives and diluents.
[0029] Suitable anionic organic detergent surfactants include
alkali metal soaps of higher fatty acids, alkyl aryl sulphonates,
for example sodium dodecyl benzene sulphonate, long chain (fatty)
alcohol sulphates, olefin sulphates and sulphonates, sulphated
monoglycerides, sulphated esters, sulphosuccinates, alkane
sulphonates, phosphate esters, alkyl isoethionates, sucrose esters
and fluoro-surfactants.
[0030] Suitable cationic organic detergent surfactants include
alkylamine salts, quaternary ammonium salts, sulphonium salts and
phosphonium salts.
[0031] Suitable non-ionic organic detergent surfactants include
condensates of ethylene oxide with a long chain (fatty) alcohol or
(fatty) acid, for example C14-15 alcohol condensed with 7 moles of
ethylene oxide (Dobanol.RTM. 45-7), condensates of ethylene oxide
with an amine or an amide, condensation products of ethylene and
propylene oxides, fatty acid alkylol amide and fatty amine oxides.
Suitable amphoteric organic detergent surfactants include
imidazoline compounds, alkylaminoacid salts and betaines.
[0032] It is more preferred that the organic surfactants are
nonionic or anionic materials, for example alkyl sulphates, alkyl
aryl sulphonates, alkyl sulphonates, primary alkyl ethoxylates and
alkylpolyglucosides or derivatives thereof.
[0033] Examples of suitable building agents for use in the
detergent compositions are phosphates, polyphosphates,
pyrophosphates, orthophosphates, phosphonates, carboxylates,
polycarboxylates, succinates, silicates, carbonates and sulphates.
Other components which can be included in a detergent composition
of the invention include oxygen releasing compounds such as
perborates, persulphates, persilicates, perphosphates,
percarbonates and other bleaching agents and alumino-silicates, for
example, zeolites. Examples of organic components are
anti-redeposition agents such as carboxymethylcellulose,
brighteners, chelating agents such as ethylene diamine tetra-acetic
acid and nitrilotriacetic acid, enzymes and bacteriostats. Other
optional components include materials commonly found in laundry and
cleaning compositions such as colorants, dyes, perfumes, corrosion
inhibitors, soil suspending agents, anti-caking agents, softeners,
clays, some of which may be encapsulated.
[0034] The amount of foam control agent to be used in a detergent
composition according to the invention will depend on such factors
as the required amount of foam control, the type of detergent and
the end-use application of the detergent composition. Preferably a
detergent composition according to the present invention comprises
from 0.005 to 2% by weight of the silicone antifoam material, more
preferably from 0.01 to 0.5% and most preferably from 0.02 to 0.2%
of the silicone antifoam material, with the ratio of unsaturated
alcohol to silicone antifoam being as described above.
[0035] The following examples are provided to illustrate the
invention. All parts and percentages are given by weight unless
otherwise indicated.
EXAMPLE 1
[0036] An encapsulated foam control agent was produced comprising
11.5% of a branched liquid siloxane antifoam as described in
EP217501 and "TS720" hydrophobic silica (5% based on liquid
siloxane) mixed with 17% of an ethoxylated fatty alcohol based
binder and sprayed on 71.5% starch.
[0037] 0.35 g of the encapsulated foam control agent and 1.00 g
oleyl alcohol were added to 78.5 g detergent powder used to wash 16
towels (3.2 kg load) in 14 liters water in a "Miele W934" (Trade
Mark) front loading washing machine. Wash tests were carried out at
40.degree. C. and 95.degree. C. The height of foam was observed
every 5 minutes throughout each wash test and during each of 3
rinse cycles; 0=no foam, 50=half window of foam, 100=full window of
foam, 120=overflow from washing machine.
[0038] In a comparative example C1, 1.75 g of the encapsulated foam
control agent was added to the detergent without any oleyl alcohol
and was tested similarly.
[0039] Further comparative tests were carried out at a different
date using the foam control agents of Example 1 (0.35 g
encapsulated antifoam plus 1.0 g oleyl alcohol, shown in Table 1 as
1A) and of comparative example C1 (1.75 g encapsulated antifoam,
shown as C1A) and further comparative examples in which the oleyl
alcohol of Example 1 was replaced by 1-hexadecanol (C2) or
octadecanol (C3). These tests used a shorter wash cycle at
40.degree. C. than at 95.degree. C. The results of all the above
tests are shown in Table 1.
1 TABLE 1 Example C1 1 C1A 1A C2 C3 Temp .degree. C. 40 95 40 95 40
95 40 95 40 95 40 95 0 0 0 0 0 0 0 0 0 0 0 0 0 5 0 0 0 0 0 0 0 0 60
50 50 40 10 0 0 0 10 0 0 0 0 80 80 80 80 15 20 20 60 50 50 60 10 10
100 100 100 100 20 60 50 100 100 70 100 10 50 100 100 100 100 25 70
80 100 100 90 100 40 60 100 100 100 100 30 90 100 100 100 100 100
60 100 100 100 100 100 35 100 100 100 100 100 100 70 100 100 120
100 100 40 100 100 100 100 100 100 80 100 100 120 100 100 45 100
100 100 100 100 100 80 100 100 100 100 100 50 100 100 100 100 100
100 100 100 55 100 100 100 100 100 100 100 100 Sum 740 750 860 860
610 860 300 720 840 1070 830 1020 R1 (1h09) 50 40 60 40 60 90 25 30
80 60 100 80 R2 (1h20) 30 30 40 20 25 40 15 15 50 15 80 40 R3
(1h30) 10 0 10 0 20 15 10 0 35 15 60 20
[0040] It can be seen from Table 1 that the use of oleyl alcohol at
a level of 1 or 2% based on the detergent powder allows the amount
of siloxane foam control agent to be reduced by 80% while
maintaining a similar or improved level of foam control. Improved
foam control is shown particularly in the rinse cycle. Saturated
alcohols such as hexadecanol or octadecanol do not show this
effect.
EXAMPLES 2 TO 4
[0041] The procedure of Example 1 was repeated varying the
proportion of hydrophobic silica in the siloxane antifoam and the
amount of oleyl alcohol added as shown below
2 Hydrophobic silica Weight of oleyl % based on siloxane alcohol
Example 2 2.5% "TS530" 1.17 g Example 3 2.5% "TS530" 2.00 g Example
4 2.5% "TS530" and 1.00 g 2.5% "Sipernat D10"
[0042] The antifoams of Examples 2 to 4 were tested in wash tests
as described in Example 1. The results are shown in Table 2
below.
3 TABLE 2 Example 2 3 4 Temp .degree. C. 40 95 40 95 40 95 0 0 0 0
0 0 0 5 0 0 0 0 0 0 10 0 0 0 0 0 0 15 0 50 0 0 50 0 20 0 80 0 0 100
40 25 60 100 0 0 100 60 30 80 100 0 10 100 80 35 100 100 40 30 100
100 40 100 100 60 60 100 100 45 100 100 100 100 100 100 50 100 100
100 100 100 100 55 100 100 100 100 100 100 Sum 640 830 400 400 850
680 R1 (1h09) 60 50 40 50 60 40 R2 (1h20) 30 10 10 20 40 20 R3
(1h30) 10 0 0 0 20 0
EXAMPLE 5
[0043] A siloxane foam control agent was prepared by blending 92%
of a methyl ethyl, methyl 2-phenylpropyl siloxane fluid (as
described in Example 1 of U.S. application Ser. No. 09/636,799)
with 4% of a silicone resin of M/Q ratio 0.65:1 and 4% hydrophobic
silica. 12.3% of this siloxane foam control agent was mixed with
17% binder and 70.7% zeolite to produce an encapsulated foam
control agent.
[0044] 0.67 g of the encapsulated foam control agent and 1.00 g
oleyl alcohol were added to 83.5 g detergent powder and a wash test
at 40.degree. C. was carried out as described above. A comparative
example C5 was carried out using 0.67 g of the encapsulated foam
control agent alone.
EXAMPLES 6 AND 7
[0045] 0.35 g of the encapsulated foam control agent described in
Example 5 and 2.0 g oleyl alcohol (Example 6) or 1.0 g oleyl
alcohol (Example 7) were added to a detergent composition. A
comparative experiment C5A was carried out using 0.69 g of the
encapsulated foam control agent of Example 5 alone. Further
comparative experiments were carried out using the formulation of
Example 6 with the oleyl alcohol replaced by 1-hexadecanol (C6) or
octadecanol (C7). The wash test results are shown in Table 3
below
4 TABLE 3 Example 5 C5 6 7 C5A C6 C7 Temp .degree. C. 40 40 40 95
40 95 40 95 40 95 40 95 0 0 0 0 0 0 0 0 0 0 0 0 0 5 0 10 0 0 0 0 0
10 10 20 10 40 10 0 50 0 0 10 10 10 40 70 70 60 50 15 40 70 0 10 30
30 30 40 70 70 60 50 20 50 70 10 20 50 40 50 40 80 70 70 50 25 50
60 10 30 50 40 60 30 90 80 70 20 30 50 50 20 40 60 50 70 20 100 50
80 20 35 50 40 30 30 80 50 70 20 100 50 80 20 40 50 40 50 40 80 50
70 20 100 50 80 20 45 60 50 60 50 80 50 70 30 100 70 80 30 50 70 60
60 60 30 80 40 55 80 70 90 80 40 100 50 Sum 500 570 180 370 440 460
430 320 720 710 590 390 R1 (1h09) 50 50 0 20 30 35 40 50 70 40 45
20 R2 (1h20) 40 30 0 20 20 25 40 30 70 40 30 10 R3 (1h30) 30 30 0 5
20 15 40 20 50 30 30 5
[0046] It can be seen from Table 3 that the use of oleyl alcohol at
a level of 1 or 2% based on the detergent powder allows the amount
of the siloxane foam control agent described in Example 5 to be
halved while maintaining a similar or improved level of foam
control.
* * * * *