Patent ID: 6914118
Filing Date: 2005-07-05
Classification: C08G,G11B,Y10S,Y10T

Abstract:
1. A polyurethane, which has a block structure or thermoplastic properties or both, and at least one soft segment (A) and at least one hard segment (B), wherein said at least one hard segment (B) has at least one anionic anchor group L covalently bonded to a polyether segment having at least one nitrogen atom in the polyurethane, said polyurethane having a structure according to the formula I or the formula or the formula II where A, B, and L have the abovementioned meanings, Z is a radical or a compound X-Z-X which is at least difunctional with respect to Y with formation of a covalent bond, Y is a functional group reactive toward the functional groups X of the compound Z with formation of a covalent bond, X is at least one functional group which is reactive toward the functional groups Y with formation of a covalent bond, n is from 1 to 10, m is from 1 to 10 and r is from 0 to 10, the number of anchor groups L in the total polyurethane being from 1 to n−m (formulae I and Ia) or from 1 to n−r+m (formula II).