Patent ID: 6369132
Filing Date: 2002-04-09
Classification: C08J

Abstract:
A thermoplastic water soluble associative polymer obtained by dissolving and insolubilizing to form in fine particulate form said polymer, having at least about 20% lower bulk density than the same particle size polymer obtained without dissolving and insolubilizing but only by grinding, wherein the polymer is selected from the group consisting of hydrophobically modified polyether-polyurethanes, hydrophobically modified polyether-polyurethanes bearing terminal hydrophilic groups, hydrophobically modified polyacrylates, hydrophobically modified polyvinyl alcohol and copolymers thereof, hydrophobically modified polyether-polyols, hydrophobically modified polyacrylamide, hydrophobically modified aminoplast-polyethers, hydrophobically modified hydroxyethylcellulose, hydrophobically modified hydroxypropylcellulose, hydrophobically modified hydroxypropylmethylcellulose, hydrophobically modified ethylhydroxyethylcelullose and hydrophobically modified poly(acetal- or ketal-polyethers) comprising a backbone of poly(acetal- or ketal-polyether) which has ends that are capped with hydrophobic groups independently selected from the group consisting of alkyl, aryl, arylalkyl, alkenyl, arylalkenyl, cycloaliphatic, perfluoroalkyl, carbosilyl, polycyclyl, and complex dendritic groups wherein the alkyl, alkenyl, perfluoralkyl, and carbosilyl hydrophobic groups comprise 1 to 40 carbons, and the aryl, arylalkyl, arylalkenyl, cycloaliphatic and polycyclyl hydrophobic groups comprise 3 to 40 carbons.