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

US5254597A · kind A · utility

Assignee

• BASF A.G. · DE

Inventors

• Peter Horn · Heidelberg, DE
• Ulrich Mueller · Hamburg, DE
• Wolfgang Hoelderich · Bischofswerda, DE
• Rudolf Taddey · Damme, DE
• Dieter Tintelnot · Diepholz, DE
• Ludwig Schuster · Schifferstadt, DE

Key dates

• Filing date: Nov 24, 1992
• Grant date: Oct 19, 1993
• Expiry date: Nov 24, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S521/901
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the production of chlorofluorocarbon-free, urethane- or urethane- and urea-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 PA0 a) an organic and/or modified organic polyisocyanate with PA0 b) at least one relatively high-molecular-weight compound containing at least two reactive hydrogen atoms, and, if desired, PA0 c) a low-molecular-weight chain extender and/or cross-linking agent, in the presence of PA0 d) a blowing agent, PA0 e) a catalyst, PA0 f) at least one microporous activated charcoal and/or microporous carbon molecular sieve which preferably has a mean pore diameter with a frequency of occurrence of more than 40% in the range from 0.3 to 3 nm, a pore volume of from 0.20 to 1.4 ml/g and a BET surface area of from 500 to 2500 m.sup.2 /g, and, if desired, further additives and PA0 g) assistants, in a closed mold with compaction.