Production of chlorofluorocarbon-free, urethane-containing moldings having a cellular core and a compacted peripheral zone

US5334620A · kind A · utility

Assignee

• BASF SE

Inventors

• Peter Horn · Heidelberg, DE
• Ulrich Mueller · Hamburg, DE
• Wolfgang Hoelderich · Bischofswerda, DE
• Ulf Sattler · Bersenbrück, DE
• Rudolf Taddey · Damme, DE
• Dieter Tintelnot · Diepholz, DE

Key dates

• Filing date: Jun 10, 1992
• Grant date: Aug 2, 1994
• Expiry date: Jun 10, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2375/04
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process for the production of fluorochlorocarbon-free, urethane-containing, soft-elastic, semirigid or rigid moldings having a cellular core and a compacted peripheral zone and an essentially pore-free, smooth surface involves reacting PA1 a) an organic and/or modified organic polyisocyanate with PA1 b) at least one relatively high-molecular-weight compound containing at least two reactive hydrogen atoms, and, if desired, PA1 c) a low-molecular-weight chain extender and/or cross-linking agent, in the presence of PA1 d) a blowing agent, PA1 e) a catalyst, PA1 f) at least one amorphous, microporous silica gel which preferably has a mean pore diameter with a frequency of occurrence of more than 40% in the range from 0.1 to 10 nm, a pore volume of from 0.15 to 1.8 ml/g and a BET surface area of from 200 to 900 m.sup.2 /g, and, if desired, further additives and PA1 g) assistants, in a closed mold with compaction.