Patent ID: 8398809

Claim:
Amorphous polyurethane polymer which is solid at room temperature, of formula (I) where R 1 is a divalent aliphatic or cycloaliphatic or araliphatic hydrocarbon radical having 2 to 12 C atoms, which optionally contains at least one heteroatom; R 2 and R 3 either independently of one another, are each a monovalent hydrocarbon radical having 1 to 12 C atoms, or together form a divalent hydrocarbon radical having 4 to 20 C atoms which is part of an unsubstituted or substituted carbocyclic ring having 5 to 8 C atoms; Y 1 is a monovalent hydrocarbon radical having 1 to 35 C atoms which optionally contains heteroatoms; X is O or S or N—R 6 , where R 6 either is a monovalent hydrocarbon radical having 1 to 20 C atoms which optionally contains at least one carboxylic ester, nitrile, nitro, phosphonic ester, sulphone or sulphonic ester group, or is a substituent of the formula (II) m is 1 or 2 or 3, n is 0 or 1 or 2, wherein the sum of m and n is 2 or 3; A is the radical of a polyurethane polymer D, solid at room temperature and containing isocyanate groups, following removal of (m+n) isocyanate groups and prepared from the reaction of a polyol mixture comprising at least one polyester polyol PE1 which is liquid at a temperature range of −50° C. to 0° C., at least one polyester polyol PE2 which is amorphous and solid at room temperature, and at least one polyisocyanate PI, wherein in the polyol mixture the weight ratio of all polyester polyols PE1 liquid at room temperature to all amorphous polyester polyols PE2 amorphous and solid at room temperature is 0.1-0.5, the at least one polyester polyol PE1 has a molecular weight ranging from 2,000 to 8,000 g/mol, and the at least one polyester polyol PE2 has a molecular weight ranging from 1,000 to 8,000 g/mol, and has a melting point ranging from 60° C. to 130° C.