Patent ID: 6197863
Filing Date: 2001-03-06
Classification: C04B,C09D,E04F

Abstract:
A crosslinkable powder composition which is redispersible in water and comprisesa) from 30 to 95 parts by weight of at least one water-insoluble, film-forming crosslinkable polymers of at least one free-radically polymerizable, ethylenically unsaturated monomer, selected from the group consisting of vinyl esters of unbranched or branched alkylcarboxylic acids having from 1 to 15 carbon atoms, methacrylic and acrylic esters of unbranched or branched alcohols having from 1 to 12 carbon atoms, fumaric and maleic monoesters or diesters of unbranched or branched alcohols having from 1 to 12 carbon atoms, dienes, olefins, vinylaromatics and vinyl halides,b) from 5 to 70 parts by weight of at least one water-soluble polymer selected from the group consisting of polyvinyl alcohols, polyvinyl alcohols containing carboxyl groups, acetoacetyl groups or amine groups, starches, carboxymethyl-substituted starches, celluloses, casein, melamine-formaldehyde sulfonates, naphthalene-formaldehyde and sulfonateswhere at least one of the polymer components a) and b) comprises at least one comonomer unit containing crosslinkable groups, and the parts by weight of a) and b) add up to 100 parts by weight, andc) from 0.5 to 30% by weight, based on the total weight of a) and b), of at least one inorganic or organic solid crosslinking agent selected from the group consisting of functionalized, finely divided oxides of boron, aluminum, iron, cobalt, chromium, manganese, silicon, germanium, tin, titanium and zirconium, their mixed oxides, functionalized unhydrolyzed starch and cellulose powders, organic pigments, carbon black, silicone resins and pulverulent, highly crosslinked polymers, said crosslinking agents being insoluble in water and in organic solvents and have a mean particle size of from 5 nm to 100 .mu.m, said solids having, chemically bound to their surface, functional groups capable of forming covalent bonds with the crosslinkable groups of the polymers a) and b).