Aqueous polyurethane adhesive dispersions

US4861826A · kind A · utility

Assignee

• BASF SE

Inventors

• Rainer Hummerich · Worms, DE
• Michael Kerber · Cleveland Heights, US
• Lothar Maempel · Zeven, DE
• Peter Weyland

Key dates

• Filing date: Dec 15, 1987
• Grant date: Aug 29, 1989
• Expiry date: Dec 15, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2170/90
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Aqueous dispersions of polyurethanes consisting of PA1 (a) organic polyisocyanates, PA1 (b) polyesterpolyols having a molecular weight of from 500 to 5,000, PA1 (c) organic hydroxy compounds having a molecular weight of from 62 to 400 and two terminal groups which are reactive to isocyanate groups, as chain extenders, and PA1 (d) compounds containing ionic groups or groups which can be converted to ionic groups and one or more isocyanate groups or a hydroxyl or amino group which is reactive to isocyanate groups, which contain from 0.05 to 2 meq of ionic groups incorporated into the polyurethane via (d) per g of polyurethane are particularly suitable for adhesives when the chain extenders (c) are incorporated in an amount of from 1.5 to 8 moles per mole of polyols, and a minor amount of (a) can be replaced with monoisocyanates, and a minor amount of (b) with polyetherpolyols.