Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2000-08-16
2002-08-06
Reddick, Judy M. (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S003000, C524S004000, C524S007000, C524S008000, C524S262000, C524S263000, C524S264000, C524S265000, C524S266000, C524S267000, C524S268000, C524S269000, C525S193000, C525S194000, C525S225000, C525S231000, C525S232000, C525S235000, C525S239000, C525S240000, C525S241000, C525S288000, C525S326500, C525S329700, C525S330300, C525S330700, C525S331900, C525S332900, C525S333300, C525S342000
Reexamination Certificate
active
06429239
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a dispersion powder composition which is redispersible in water and is based on water-insoluble polymers, process for its preparation and its use.
2. Background Art
Dispersion powder compositions which are redispersible in water and are based on homo- or copolymers are known. Such a dispersion powder composition is prepared by spray drying the corresponding aqueous plastics dispersions in a stream of hot-air. The dispersion powders are suitable as additives to hydraulic binders in the building materials industry, and such products are furthermore employed as binders in coating compositions or in adhesives.
EP-A 228657 (U.S. Pat. No. 4,704,416) describes dispersion powders which are redispersible in water and are based on water-soluble polymers, and which comprise organic silicon compounds, preferably organopolysiloxanes. The dispersion powders are prepared by spray drying an emulsion of the organic silicon compound in an aqueous solution of the water-soluble polymer.
EP-B 279373 relates to powders which are redispersible in water and comprise organopolysiloxane, and which additionally comprise a water-soluble, film-forming polymer. They are prepared by spray drying the aqueous mixtures of the constituents mentioned.
EP-A 493168 relates to dispersion powders which are redispersible in water and are based on film-forming, water-insoluble vinyl or acrylic polymers, and which comprise silicones, more precisely organosiliconates and/or organopolysiloxanes. They are prepared by spray drying aqueous dispersions of the vinyl or acrylic polymers, to which silicones have been added before the spraying.
SUMMARY OF THE INVENTION
The invention is based on the object of providing dispersion powder compositions which are redispersible in water and are based on water-insoluble polymers, and which are modified with organosilicon compounds.
The invention relates to a dispersion powder composition which is redispersible in water and is based on water-insoluble organopolymers, wherein the powder composition comprises 0.1 to 30% by weight, based on the organopolymer content, of one or more water-dispersible silicon compounds having a boiling point under normal pressure of >160° C., from the group consisting of silanes, polysilanes, oligosiloxanes, carbosilanes, polycarbosilanes, carbosiloxanes, polycarbosiloxanes and polysilylenedisiloxanes.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Suitable water-insoluble organopolymers are: homo- and copolymers which are in the form of an aqueous dispersion or which can be converted into an aqueous dispersion, and which, if appropriate at elevated temperature and/or in an alkaline medium, form a solid film after drying on and, if appropriate, hardening. The average particle size of the dispersion powder particles is in general 1 to 1000 &mgr;m, preferably 10 to 700 &mgr;m, particularly preferably 50 to 500 &mgr;m.
Preferred water-insoluble polymers are:
vinyl ester homo- or copolymers containing one or more monomer units from the group consisting of vinyl esters of unbranched or branched alkylcarboxylic acids having 1 to 15 C atoms;
(meth)acrylic acid ester homo- or copolymers containing one or more monomer units from the group consisting of methacrylic acid esters and acrylic acid esters of unbranched or branched alcohols having 1 to 12 C atoms;
homo- or copolymers of fumaric and/or maleic acid mono- or diesters of unbranched or branched alcohols having 1 to 12 C atoms;
homo- or copolymers of dienes, such as butadiene or isoprene, and of olefins, such as ethene or propene, it being possible for the dienes to be copolymerized, for example, with styrene, (meth)acrylic acid esters or the esters of fumaric or maleic acid;
homo- or copolymers of vinyl aromatics, such as styrene, methylstyrene or vinyltoluene;
homo- or copolymers of vinyl-halogen compounds, such as vinyl chloride.
Where appropriate, water-insoluble, film-forming polyaddition and polycondensation polymers, such as polyurethanes, polyesters, polyethers (excluding polyethylene oxide), polyamides, melamine-formaldehyde resins or phenol-formaldehyde resins, if appropriate also in the form of their oligomeric precursors, are also suitable.
Preferred vinyl esters are vinyl acetate, vinyl propionate, vinyl butyrate, vinyl 2-ethylhexanoate, vinyl laurate, 1-methylvinyl acetate, vinyl pivalate and vinyl esters of &agr;-branched monocarboxylic acids having up to 10 C atoms, for example VeoVa9
R
or VeoVa10
R
. Vinyl acetate is particularly preferred.
Preferred methacrylic acid esters or acrylic acid esters are methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, n-butyl acrylate, t-butyl acrylate, n-butyl methacrylate, t-butyl methacrylate, 2-ethylhexyl acrylate. Methyl acrylate, methyl methacrylate, n-butyl acrylate and 2-ethylhexyl acrylate are particularly preferred.
Preferred ester groups of fumaric and maleic acid are the methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, t-butyl, hexyl, ethylhexyl and dodecyl group.
If appropriate, the vinyl ester copolymers can comprise 1.0 to 65% by weight, based on the total weight of the comonomer phase, of &agr;-olefins, such as ethylene or propylene, and/or vinyl aromatics, such as styrene, and/or vinyl halides, such as vinyl chloride, and/or acrylic acid esters or methacrylic acid esters of alcohols having 1 to 10 C atoms, such as methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, n-butyl acrylate, t-butyl acrylate, n-butyl methacrylate, t-butyl methacrylate and 2-ethylhexyl acrylate and/or ethylenically unsaturated dicarboxylic acid esters or derivatives thereof, such as diisopropyl fumarate, or the dimethyl, methyl t-butyl, di-n-butyl, di-t-butyl and diethyl ester of maleic acid or fumaric acid, or maleic anhydride.
If appropriate, the (meth)acrylic acid ester copolymers can comprise 1.0 to 65% by weight, based on the total weight of the comonomer phase, of &agr;-olefins, such as ethylene or propylene, and/or vinyl aromatics, such as styrene, and/or vinyl halides, such as vinyl chloride and/or ethylenically unsaturated dicarboxylic acid esters or derivatives thereof, such as diisopropyl-fumarate or the dimethyl, methyl t-butyl, dibutyl and diethyl esters of maleic acid or fumaric acid, or maleic anhydride.
In a preferred embodiment, the vinyl ester copolymers and the (meth)acrylic acid ester copolymers also comprise 0.05 to 10.0% by weight, based on the total weight of the comonomer mixture, of auxiliary monomers from the group consisting of ethylenically unsaturated carboxylic acids, preferably acrylic acid or methacrylic acid; from the group consisting of ethylenically unsaturated carboxylic acid amides, preferably acrylamide; from the group consisting of ethylenically unsaturated sulfonic acids and salts thereof, preferably vinyl-sulfonic acid; and/or from the group consisting of polyethylenically unsaturated comonomers, for example divinyl adipate, diallyl maleate, allyl methacrylate or triallyl cyanurate. Suitable auxiliary monomers are also comonomers having a crosslinking action, for example acrylamidoglycolic acid (AGA), methacrylamidoglycolic acid methyl ester (MAGME), N-methylolacrylamide (NMAA), N-methylolmethacrylamide, allyl N-methylolcarbamate and alkyl ethers, such as the isobutoxy ether, or esters of N-methylolacrylamide, of N-methylolmethacrylamide or allyl N-methylolcarbamate.
Corresponding statements to those for the (meth)acrylic acid ester copolymers apply to the copolymers of esters of maleic or fumaric acid.
The water-insoluble polymers mentioned which can be polymerized by free radicals are preferably prepared by the emulsion polymerization process. The polymerization can be carried out discontinuously or continuously, with or without the use of seed latices, with initial introduction of all the constituents or individual constituents of the reaction mixture, or with initial introduction of a portion and subsequent metering of the con
Adler Klaus
Eck Herbert
Gerhardinger Dieter
Hopf Heinrich
Jodlbauer Franz
Brooks & Kushman P.C.
Reddick Judy M.
Wacker-Chemie GmbH
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