Production of polyurethane foams

US6107355A · kind A · utility

Assignee

• BASF SE

Inventors

• Peter Horn · Heidelberg, DE
• Dieter Tintelnot · Diepholz, DE

Key dates

• Filing date: Feb 13, 1996
• Grant date: Aug 22, 2000
• Expiry date: Feb 13, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2110/0066
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

In a process for producing polyurethane foams, preferably semirigid polyurethane foams and flexible, semirigid and rigid polyurethane integral foams, PA0 a) at least one modified or unmodified organic polyisocyanate is reacted with PA0 b) at least one relatively high molecular weight compound containing at least two reactive hydrogens and, if desired, PA0 c) low molecular weight chain extenders and/or crosslinkers in the presence of PA0 d) blowing agents, preferably water and/or (cyclo)alkanes, PA0 e) a catalyst mixture comprising, according to the invention, PA1 e') from 35 to 65 parts by weight of di-n-octyltin bis(2-ethylhexyl thioglycolate) and PA1 e") from 65 to 35 parts by weight of mono-n-octyltin tris(2-ethylhexyl thioglycolate) and also, if desired, PA1 e'") cocatalysts selected from the group of tertiary amines, alkali metal and alkaline earth metal salts of monocarboxylic acids having from 1 to 20 carbon atoms and PA0 f) if desired, additives, with the reaction for forming the polyurethane integral foams being carried out in a closed mold with compaction at a degree of compaction of from 1.4 to 8.3.