Patent ID: 8765828

Claim:
A multi-component polyurethane foam-forming system, the system comprising: a) a polyisocyanate, b) a polyether polyol or polyester polyol, a) and b) being separate components of the multi-component polyurethane foam-forming system, c) a blowing agent, d) one or more optional additives or auxiliary compounds, and e) a water-redispersible polymer powder that comprises a homopolymer or copolymer of one or more monomers from the group of vinyl esters of unbranched or branched alkylcarboxylic acids having from 1 to 15 carbon atoms, methacrylic esters, and acrylic esters of alcohols having from 1 to 15 carbon atoms, vinylaromatics, and olefins, the homopolymer or copolymer having a glass transition temperature Tg from −20° C. to +50° C., wherein: the water-redispersible polymer powder is a dried powder of an aqueous dispersion of the homopolymer or copolymer and a protective colloid included in an amount from 3 to 30 wt % based on a total weight of the homopolymer or copolymer, the dried powder being redispersible in the polyether polyol or polyester polyol, and the water-redispersible polymer powder is dispersed in the polyether polyol or polyester polyol, an amount of the water-redispersible polymer powder being from 0.1 to 40 parts by weight per one hundred parts of the polyether polyol or polyester polyol, and a X50 particle size diameter being from 50 to 100 micrometers of the water-redispersible polymer powder dispersed in the polyether polyol or polyester polyol.