Aqueous polyurethane dispersions

US5342915A · kind A · utility

Assignee

• BASF SE

Inventors

• Ulrike Licht · Mannheim, DE
• Karl Haeberle · Speyer, DE
• Erich Gulbins · Heidelberg, DE
• Maria Gyopar Rau · Haßloch, DE
• Gernot Franzmann · Worms, DE
• Michael Portugall · Monsheim, DE

Key dates

• Filing date: Dec 9, 1992
• Grant date: Aug 30, 1994
• Expiry date: Dec 9, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2170/80
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Aqueous dispersions contain a polyurethane which consists essentially of PA0 a) organic polyisocyanates and, if required, minor amounts of monoisocyanates, PA0 b) dihydroxy compounds 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, PA0 c) if required, polyhydroxy compounds which differ from (b) and have a molecular weight of from more than 500 to 5,000 g/mol, PA0 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 PA0 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.