U.S. patent application number 11/578291 was filed with the patent office on 2010-05-13 for use of a cationic silicon dioxide dispersion as a textile finishing agent.
This patent application is currently assigned to DEGUSSA AG. Invention is credited to Christoph Batz-Sohn, Heinz Lach, Wolfgang Lortz, Gabriele Perlet, Werner Will.
Application Number | 20100117021 11/578291 |
Document ID | / |
Family ID | 34965862 |
Filed Date | 2010-05-13 |
United States Patent
Application |
20100117021 |
Kind Code |
A1 |
Batz-Sohn; Christoph ; et
al. |
May 13, 2010 |
Use of a Cationic Silicon Dioxide Dispersion as a Textile Finishing
Agent
Abstract
An aqueous dispersion for use as a finishing agent for textiles,
wherein the dispersion contains a pyrogenically produced,
aggregated silicon dioxide powder and a cationic polymer which is
soluble in the dispersion, wherein the cationic polymer is present
in a quantity such that the particles of the silicon dioxide powder
exhibit a positive zeta potential.
Inventors: |
Batz-Sohn; Christoph;
(Hanau-Mittelbuchen, DE) ; Lortz; Wolfgang;
(Waechtersbach, DE) ; Lach; Heinz; (Rodenbach,
DE) ; Perlet; Gabriele; (Grosskrotzenburg, DE)
; Will; Werner; (Gelnhausen, DE) |
Correspondence
Address: |
OBLON, SPIVAK, MCCLELLAND MAIER & NEUSTADT, L.L.P.
1940 DUKE STREET
ALEXANDRIA
VA
22314
US
|
Assignee: |
DEGUSSA AG
DUESSELDORF
DE
|
Family ID: |
34965862 |
Appl. No.: |
11/578291 |
Filed: |
April 28, 2005 |
PCT Filed: |
April 28, 2005 |
PCT NO: |
PCT/EP05/04540 |
371 Date: |
October 13, 2006 |
Current U.S.
Class: |
252/8.81 |
Current CPC
Class: |
D06M 15/41 20130101;
D06M 15/61 20130101; D06M 11/79 20130101; D06M 15/3564 20130101;
D06M 15/3562 20130101 |
Class at
Publication: |
252/8.81 |
International
Class: |
D06M 13/224 20060101
D06M013/224 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 29, 2004 |
DE |
10 2004 021 092.6 |
Claims
1. An aqueous dispersion for use as a finishing agent for textiles,
characterised in that the dispersion contains a pyrogenically
produced, aggregated silicon dioxide powder and a cationic polymer
which is soluble in the dispersion, wherein the cationic polymer is
present in a quantity such that the particles of the silicon
dioxide powder exhibit a positive zeta potential.
2. An aqueous dispersion for use as a finishing agent for textiles
according to claim 1, characterised in that the pyrogenically
produced silicon dioxide powder has a specific surface area of 50
to 300 m.sup.2/g.
3. An aqueous dispersion for use as a finishing agent for textiles
according to claim 1, characterised in that the pyrogenically
produced silicon dioxide powder is doped with up to 1 wt. % of
aluminium oxide or potassium.
4. An aqueous dispersion for use as a finishing agent for textiles
according to claim 1, characterised in that it has a content of
silicon dioxide powder of 3 to 50 wt. %.
5. An aqueous dispersion for use as a finishing agent for textiles
according to claim 1, characterised in that the content of cationic
polymer is between 0.1 wt. % and 15 wt. %, relative to the quantity
of cationic polymer and silicon dioxide powder.
6. An aqueous dispersion for use as a finishing agent for textiles
according to claim 1, characterised in that the cationic polymer
has a molecular weight of less than 100 000 g/mol.
7. An aqueous dispersion for use as a finishing agent for textiles
according to claim 1, characterised in that the cationic polymer is
a polymer with at least one quaternary ammonium group, a
phosphonium group, an acid adduct of a primary, secondary or
tertiary amine group, a polyethyleneimine, a polydiallylamine or a
polyallylamine, a polyvinylamine, a dicyandiamide condensation
product, a dicyandiamide-polyamine cocondensation product, a
polyamide-formaldehyde condensation product.
8. An aqueous dispersion for use as a finishing agent for textiles
according to claim 1, characterised in that the aggregate size in
the dispersion is less than 0.5 .mu.m.
9. An aqueous dispersion for use as a finishing agent for textiles
according to claim 1, characterised in that the pH value thereof is
between 2 and 8.
Description
[0001] The invention relates to a cationic silicon dioxide
dispersion for use as a textile finishing agent.
[0002] It has long been known to use silica as an non-slip agent
for textiles (Ullmann's Encyclopedia of Industrial Chemistry, Vol.
A26, p. 328, 5th edition). These silica sols may have specific
surface areas of more than 1000 m.sup.2/g. They generally assume
the form of isolated, spherical particles with diameters of a few
nanometres. In order to prevent gelation, they are generally
stabilised by the addition of aluminium salts or polymers. In the
case of use as an non-slip agent, it has proved disadvantageous
that, in order to achieve the desired effect of slip resistance, it
is sometimes necessary to use large quantities of silica sol or
cationised silica sol. This is possibly due to the spherical
structure of the silica sol particles. Better results may be
obtained with partially aggregated silica sol particles, as
described in WO 2004/007367. The low degree of aggregation of the
silica sol particles is disadvantageous here. Furthermore, the bond
between the silica sol particles is not so strong that the energy
introduced in the event of any external force applied to the
particles is sufficient to separate the aggregates again.
[0003] The object of the present invention is to provide a
dispersion containing silicon dioxide which may be used as a
textile finishing agent and avoids the disadvantages of the prior
art.
[0004] The present invention provides an aqueous dispersion for use
as a finishing agent for textiles, wherein the dispersion contains
a pyrogenically produced, aggregated silicon dioxide powder and a
cationic polymer which is soluble in the dispersion, wherein the
cationic polymer is present in a quantity such that the particles
of the silicon dioxide powder exhibit a positive zeta
potential.
[0005] Pyrogenically produced silicon dioxide powders should be
taken to mean those which are obtainable by flame hydrolysis or
flame oxidation. In these processes, primary particles of approx. 5
to 50 nm are initially formed, which, as the reaction proceeds,
combine to form aggregates. These aggregates form a
three-dimensional network. The aggregates cannot generally be
broken back down into the primary particles.
[0006] The specific surface area of the pyrogenically produced
silicon dioxide powder in the aqueous dispersion is not limited. It
may preferably have a specific surface area of 50 to 300
m.sup.2/g.
[0007] A preferred dispersion may be one in which the pyrogenically
produced silicon dioxide powder is doped with up to 1 wt. % of
aluminium oxide or potassium. Such powders are described, for
example, in EP-A-995718 and EP-A-1216956.
[0008] The content of pyrogenically produced silicon dioxide powder
in the dispersion may preferably amount to 3 to 50 wt. %.
[0009] Selection of the cationic polymer is not limited according
to the present invention, but the quantity thereof is. The cationic
polymers must be present in the dispersion in a quantity such that
the surface of the particles of the silicon dioxide powder is
completely covered with cationic polymer and consequently exhibits
a positive zeta potential.
[0010] The content of cationic polymer is preferably between 0.1
and 15 wt. % and particularly preferably between 0.8 and 5 wt. %,
relative to the quantity of cationic polymer and silicon dioxide
powder.
[0011] Cationic polymers with a molecular weight of less than 100
000 g/mol are preferred.
[0012] Preferred cationic polymers may be: polymers with at least
one quaternary ammonium group, a phosphonium group, an acid adduct
of a primary, secondary or tertiary amine group, a
polyethyleneimine, a polydiallylamine or a polyallylamine, a
polyvinylamine, a dicyandiamide condensation product, a
dicyandiamide-polyamine cocondensation product, a
polyamide-formaldehyde condensation product.
[0013] Preferred polymers may be those based on a diallyl ammonium
compound, particularly preferably those based on a dialkyldiallyl
compound which may be obtained by a free-radical cyclisation
reaction of diallylamine compounds and exhibit structure 1 or 2.
Structures 3 and 4 represent copolymers based on dialkyldiallyl
compounds.
[0014] In these structures, R.sub.1 and R.sub.2 represent a
hydrogen atom, an alkyl group with 1 to 4 C atoms, methyl, an
ethyl, an n-propyl, an iso-propyl, an n-butyl-, an iso-butyl or a
tert.-butyl group, wherein R.sub.1 and R.sub.2 may be identical or
different. A hydrogen atom of the alkyl group may furthermore be
substituted by a hydroxy group. Y represents a free-radically
polymerisable monomer unit, such as for example sulfonyl,
acrylamide, methacrylamide, acrylic acid or methacrylic acid.
X.sup.- represents an anion.
[0015] A poly(diallyldimethyl ammonium chloride) solution (PDADMAC
solution in water) may be mentioned by way of example.
##STR00001##
[0016] The aggregate size of the silicon dioxide particles is not
limited, but may preferably be smaller than 0.5 .mu.m. At this size
it is, for example, possible to influence the handle and lustre of
the textiles.
[0017] The pH value of the dispersion may preferably be between 2
and 8.
[0018] The dispersion may, for example, be produced as described in
EP-A-1013605 or EP-A-1331254.
[0019] The dispersion exhibits the advantage over prior art
dispersions containing silica sols which are either not aggregated
or may be present in partially aggregated form so that less silicon
dioxide need be used in order to bring about, for example, the same
slip resistance in the textiles. Additionally, the aggregate size
of the particles and thus the handle and lustre of the textiles may
be adjusted by suitable dispersion techniques. The advantages are
probably attributable to the aggregated structure of the
pyrogenically produced silicon dioxide powder.
EXAMPLES
Cationic Silica-Dispersion According to the Invention (DI)
[0020] 24.38 g Polyquat 40U05NV (40% PDADMAC solution in water,
molecular weight ca 5000 g/mol, Katpol GmbH, Bitterfeld) is
dissolved in 800 g desalinated water. This mixture is gradually
incorporated into 600 g silicon dioxide powder doped with 0.25 wt.
% aluminium oxide using a dissolver. Sufficient water is then added
to achieve a solids content of 41%. This is then dispersed for 30
min at 7000 rpm. The pH value of the dispersion is 2.8, the
viscosity 28 mPas at 1/s. The zeta potential is measured as +42 mV
by CVI. The isoelectrical point is at pH 10.1.
Cationic Silica-Dispersion (Reference Dispersion According to the
State of the Art) (DII)
[0021] Durasol.RTM.5071, Cognis: 25 wt-% cationic, colloidal silica
dispersion.
[0022] Foulard-Process: The dispersion DI and DII are contacted
with a viscose (Application A1) or a polyester textile (Application
A2) using a Foulard-process.
[0023] The liquor compositions for Al comprises 100 g/l STABITEX
ETR, 6.1 g/l D1 respectively 15 g/l DII, 30 g/l ADASIL SM, 20 g/l
ADALIN NI, 20 g/l MgCl.sub.2, 1,0 g/l FORYL 100. The pH of the
liquor is <5,5, the liquor pick-up is 100%, the application is
dry/wet, temperature for drying is 110.degree. C. and condensation
takes 3 minutes at 150.degree. C.
[0024] STABITEX, DURASOL, ADASIL, ADALIN and FORYL are all
trademarks of Cognis.
[0025] The liquor composition for A2 is 22 g/l D1 respectively 45
g/l DII. The pH of the liquor is <5,5, the liquor pick-up is
20%, the application is wet/wet, temperature for drying is
110.degree. C.
[0026] In the applications A1 as well as A2 a significant less
amount of the dispersion DI compared to state of the art dispersion
DII suffice to give the same non-slip effect as measured according
DIN 53 934.
* * * * *