Process for the production of foam plastics based on polyisocyanates having a light and yellowing resistant top layer and resultant product

US4242410A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Eberhard Konig · Kronberg, DE
• Manfred Schonfelder · Leverkusen, DE
• Josef Pedain · Cologne, DE

Key dates

• Filing date: Feb 9, 1979
• Grant date: Dec 30, 1980
• Expiry date: Feb 9, 1999

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/249992
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The instant invention is directed to a process for the production of molded polyisocyanate-based foam products having a compact, light- and yellowing-resistant polyurethane-based top layer comprising the steps of: PA1 A. coating a mold with a liquid polyurethane-polyurea-based coating agent, containing a binder, which reacts to form a light- and yellowing-resistant top layer and PA1 B. introducing a foamable reaction mixture into said mold, wherein said binder comprises: PA1 (i) at least one isocyanate prepolymer having at least two exclusively aliphatically and/or cycloaliphatically bound isocyanate groups and PA1 (ii) a hardener mixture composed of water and primary polyamines, at least partly in aldimine- or ketimine-blocked form, which have aliphatically and/or cycloaliphatically bound amino groups.