Patent ID: 6291580
Filing Date: 2001-09-18
Classification: A61K,A61Q,C08G

Abstract:
A process for preparing a polyurethane polymer comprising dispersing the polymer in water after at least 50% of the theoretical isocyanate reaction has taken place, but before completion of the reaction, wherein the polyurethane polymer is prepared froma) monomers consisting essentially of:(i) one or more 2,2-hydroxymethyl-substituted carboxylic acids, represented by the formula ##STR2##in which R represents hydrogen, or C.sub.1 -C.sub.20 alkyl, present in a sufficient amount by weight to give 0.35-2.25 milliequivalents of carboxyl functionality per gram of polyurethane,(ii) about 5 to about 90% by weight, based on the weight of the polyurethane, of active hydrogen containing organic components, other than the 2,2-hydroxymethyl-substituted carboxylic acids, comprising a combination of at least one component (A) and at least one component (B); or at least one component (C) in combination with (A) and/or (B); or at least one component (C), wherein component (A) comprises a polymer with at least two active hydrogen atoms having a Tg less than 5.degree. C.; component (B) comprises active hydrogen containing components comprising 5 to 14-membered rings, wherein the ring structure is heterocyclic, aliphatic, aromatic, cyclic, alicylic, and/or spiro rings, and said 5-14 membered rings are substituted with zero to sixteen alkoxylate units; and component (C) comprises active hydrogen containing components comprising 5 to 14-membered rings, wherein the ring structure is heterocyclic, aliphatic, aromatic, cyclic, alcyclic, and/or spiro rings, and said 5 to 14 membered rings are substituted with greater than sixteen alkoxylate units; with the proviso that (A), (B), and (C) are non-halogentaed components,(iii) one or more organic diisocyanates present to react with the active hydrogens of the organic components, excepting the hydrogen on the carboxylate of the 2,2-hydroxymethyl-substituted caboxylic acid;(b) a diluent selected from the group consisting of(i) water,(ii) water and 0 to 90%, by weight of the diluent, of one or more organic solvents, and (iii) organic solvent.