Patent ID: 6825268
Filing Date: 2004-11-30
Classification: C08G,C08L,C09D,C09J

Abstract:
A polyurethane or polyurethane polymer hybrid dispersion having low hydrophilicity, prepared by the process comprising the steps of reactinga) 50 to 100 parts by weight of a hydrophobically modified block copolymer (A)(i) having two or more hydroxyl groups and a molecular weight of 500 to 6,000 dalton, comprising 10 to 90% by weight of a polymer having properties imparting water repellency and 90 to 10% by weight of a polypropylene oxide polymer, and/or 50 to 100 parts by weight of a hydrophobic block copolymer (A) (ii) having two or more hydroxyl groups and a molecular weight of 500 to 6,000 dalton, comprising two or more hydrophobic alkylene oxides, and/or 50 to 100 parts by weight of a hydrophobically modified random copolymer (A) (iii) having two or more hydroxyl groups and a molecular weight of 500 to 6,000 dalton, comprising 10 to 90% by weight of a hydrophobic alkylene oxide in combination with suitable initiator molecules and 90 to 10% by weight of propylene oxide; b) 14 to 140 parts by weight of a polyol component (B), containing b1) 2 to 20 parts by weight of a low molecular weight and anionogenic polyol component (B)(i) having two or more hydroxyl groups and one or wore carboxyl and/or sulfo group(s) inert to polyisocyanates and a molecular weight of 100 to 1,000 dalton, b2) if required, 2 to 20 parts by weigh of a low molecular weight polyol component (B)(ii) having two or more hydroxyl groups and a molecular weight of 50 to 499 dalton, b3) if required, 10 to 100 parts by weight of a further polymeric polyol (B) (iii) having two or more hydroxyl groups and a molecular weight of 500 to 6,000 dalton; c) 25 to 250 parts by weight of a polyisocyanate component (C) comprising at least one polyisocyanate, polyisocyanate derivative or polyisocyanate homolog having two or more aliphatic or aromatic isocyanate groups; d) 2 to 20 parts by weight of a neutralizing component (D); e) 3 to 30 parts by weight of a chain-extender component (E); and f) 100 to 5,000 parts by weight of water to give a solvent-free or low-solvent polyurethane dispersion and, if required, then allowing said dispersion to react further with g) 117.5 to 3,200 parts by weight of a monomer component (F) comprising at least one monomer having one or more double bonds capable of free radical polymerization and h) 0.5 to 50 parts by weight of an initiator component (G) comprising at least one lipophilic free radical initiator having one or more thermally labile azo or peroxo groups to give a solvent-free or low-solvent polyurethane polymer hybrid dispersion.