Production of plastic foams, preferably rigid foams containing urethane groups or urethane and isocyanurate groups, and blowing agent-containing emulsions for this purpose

US5205956A · kind A · utility

Assignee

• BASF SE

Inventors

• Otto Volkert · Bad Dürkheim, DE
• Corinne Meynard · Clichy, FR

Key dates

• Filing date: Jun 26, 1992
• Grant date: Apr 27, 1993
• Expiry date: Jun 26, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S521/91
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process for the production of plastic foams, preferably rigid foams containing urethane groups or urethane and isocyanurate groups, by 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 crosslinking agent, in the presence of PA0 d) a blowing agent, PA0 e) a catalyst and, if desired, PA0 f) assistants and/or additives, in which the blowing agent (d) used is at least one vinylfluoroalkane of the formula CH.sub.2 .dbd.CH--C.sub.n F.sub.2n+1 in which n is an integer from 1 to 6, (di), or a mixture of at least one such vinylfluoroalkane (di) and at least one further physical and/or chemical blowing agent (dii) which is different from (di), blowing agent-containing emulsions which contain at least one vinylfluoroalkane and at least one starting component (a), (b), (c) or (b) and (c) and said plastic foams containing at least one vinylfluoroalkane as insulating gas.