Manufacture of light-stable polyurethane integral foams

US4256841A · kind A · utility

Assignee

• BASF SE

Inventors

• Heinrich Horacek · Puchenau, AT
• Ernst Schoen · Diepholz, DE
• Erhardt Reich · Damme, DE
• Otto Volkert · Bad Dürkheim, DE

Key dates

• Filing date: May 14, 1979
• Grant date: Mar 17, 1981
• Expiry date: May 14, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2410/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

To prepare light-stable polyurethane integral skin foams, especially soft integral foams, aliphatic and/or cycloaliphatic polyisocyanates, both categories preferably containing urethane groups and/or biuret groups, are reacted with polyols in the presence of blowing agents and of a synergistic catalyst combination comprising an alkali metal hydroxide, alkali metal alcoholate, alkali metal phenolate, alkali metal salt of a weak acid and/or hexahydrotriazine derivative and an organic tin, zinc and/or iron(II) compound, in the presence or absence of assistants and adjuvants. The preferred catalyst combination is tri-(dimethylaminopropyl)-s-hexahydrotriazine and dibutyl-tin dilaurate.