Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1996-09-18
1998-05-19
Smith, Jeffrey T.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524266, 524269, C08K 334
Patent
active
057537330
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a silicon-modified dispersion powder composition which is redispersible in water and is based on water-insoluble polymers, a 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 of ethylenically unsaturated monomers 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. In this procedure, the silicones are present in emulsion and the water-insoluble polymers in dispersion before the spray drying, so that after the spray drying or the redispersion, products in which the components are present in separate particles are obtained.
The invention was 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 in a manner such that the two components are present together in the powder particles and in the redispersed particles, and if appropriate are bonded to one another via chemical bonds.
SUMMARY OF THE INVENTION
The invention relates to a dispersion powder composition which is redispersible in water and is based on water-insoluble homo- or copolymers of preferably ethylenically unsaturated monomers and one or more organosilicon compounds and, if appropriate, further additives, such as protective colloids and antiblocking agents, obtainable by
a) polymerization of one or more monomers in the presence of 0.1 to 30% by weight, based on the total weight of the monomers, of one or more organosilicon compounds which are dispersible in water and have a boiling point under normal pressure of >160.degree. C., from the group consisting of silanes, polysilanes, oligosiloxanes, polysiloxanes, carbosilanes, polycarbosilanes, carbosiloxanes, polycarbosiloxanes and polysilylenedisiloxanes and
b) spray drying of the product thus obtained, if appropriate before or after addition of the additives mentioned.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Preferred water-insoluble polymers are: the group consisting of vinyl esters of unbranched or branched alkylcarboxylic acids having 1 to 15 C atoms; units from the group consisting of methacrylic acid esters and acrylic acid esters of unbranched or branched alcohols having 1 to 12 C atoms; unbranched or branched alcohols having 1 to 12 C atoms; olefins, such as ethene or propene, it being possible for the dienes to be copolymerized, for example with styrene, (methacrylic acid esters or the esters of fumaric of maleic acid; vinyltoluene;
Where appropriate, water-insoluble, film-forming polyaddition and polycondensation polymers, such as polyurethanes polyesters, polyethers, polyamides, epo
REFERENCES:
patent: 3203919 (1965-08-01), Brachman et al.
patent: 4704416 (1987-11-01), Eck et al.
patent: 5578668 (1996-11-01), Colombet
English Derwent Abstract AN 92-219270.
Houben-Weyl, Methoden der organischen Chemie, vol. E20, p. 1782 et seq. 2219 et seq., Georg Thieme Verlag, Stuttgart, 1987.
Houben-Weyl, Methoden der organischen Chemie, vol. XIV,1, Makromolekulare Stoffe, pp. 192-208, Georg Thieme Verlag, Stuttgart 1961.
Adler Klaus
Eck Herbert
Hopf Heinrich
Jodlbauer Franz
von Au Guenter
Smith Jeffrey T.
Wacker-Chemie GmbH
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