Process for the preparation of elastomeric molded parts having urethane or urethane and urea groups with improved light fastness and weather resistance

US4590219A · kind A · utility

Assignee

• BASF SE

Inventors

• Dietmar Nissen · Heidelberg, DE
• Matthias Marx · Fürstenfeldbruck, DE
• Hans U. Schmidt · Griesheim, DE

Key dates

• Filing date: Apr 22, 1983
• Grant date: May 20, 1986
• Expiry date: Apr 22, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S264/83
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the preparation of elastomeric molded parts having urethane or urethane and urea linkages which comprises reacting PA0 (a) an organic polyisocyanate, PA0 (b) a polyhydroxyl compound selected from the group consisting of PA1 (i) polyester polyols with molecular weights of 1000 to 3000 and hydroxyl numbers of 170 to 35 produced by polycondensation of organic dicarboxylic acids and a polyol mixture of at least 3 polyols; PA1 (ii) polyether polyols having terminal ester groups, molecular weights of 1000 to 8000 and hydroxyl numbers of 170 to 15; and PA1 (iii) mixtures thereof; PA0 (c) a chain extender wherein components (a) through (c) are processed according to reaction injection molding techniques in open or closed molds. The reaction is preferably carried out as a one-shot process and may also be carried out in the presence of blowing agents (d), auxiliaries (e), and additives (e). The non-cellular and/or microcellular elastomeric molded parts produced according to the method of this invention are particularly well suited for use in the automobile industry, for example, as bumper covers and body parts such as fenders, spoilers, wheel well expan…