Aqueous polyurethane dispersions

Details Aqueous polyurethane dispersions Aqueous polyurethane dispersions

C - Chemistry, Metallurgy

08

L

C08L 75/04 (2006.01) C08G 18/08 (2006.01) C08G 18/42 (2006.01) C08G 18/75 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2084179

Abstract of the Disclosure: Aqueous dispersions contain a polyurethane which consists essentially of a) organic polyisocyanates and, if required, minor amounts of monoisocyanates, b) dihydroxy compounde having a molecular weight of from more than 500 to 10,000 g/mol and at least 2 carboxyl or carboxylate groups in the molecule and which are obtainable by reacting dihydroxy compounds with tetracarboxylic dianhydrides in a molar ratio of from 2 : 1 to 1.05 : 1, c) if required, polyhydroxy compounds which differ from (b) and have a molecular weight of from more than 500 to 5,000 g/mol, d) if required, compounds having at least one group which is reactive toward isocyanate and at least one anionic group or group convertible into an anionic group and having a molecular weight of from 60 to 500 g/mol and e) if required, compounds which differ from d) and e) and have at least 2 groups which are reactive toward isocyanate and a molecular weight of from 60 to 500 g/mol.

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