Production of moldings containing ester and urethane groups, isocyanate semiprepolymers containing ester groups for this purpose and their use

US5585409A · kind A · utility

Assignee

• BASF SE

Inventors

• Otto Volkert · Bad Dürkheim, DE
• Peter Brandt · Ludwigshafen, DE
• Harald Fuchs · Eisenberg (Pfalz), DE

Key dates

• Filing date: May 24, 1996
• Grant date: Dec 17, 1996
• Expiry date: May 24, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2410/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for producing moldings containing ester and urethane groups and having a cellular core and a compacted surface zone, preferably shoe soles, comprises reacting PA1 a) isocyanate semiprepolymers containing ester groups and having an isocyanate content of from 10 to 26% by weight, which in turn are prepared by reacting PA2 ai) 4,4'-MDI or mixtures of 4,4'-MDI and modified or unmodified MDI isomers, with PA2 aii) difunctional to trifunctional polyester polyols having molecular weights of from 600 to 3000 and PA2 aiii) at least one branched-chain dihydroxy compound containing at least one bonded ester unit as bridge and having a molecular weight of up to 500, with PA1 b) at least one relatively high molecular weight polyhydroxyl compound and, if desired, PA1 c) low molecular weight chain extenders and/or crosslinkers in the presence of PA1 d) blowing agents, PA1 e) catalysts and, if desired, PA1 f) additives in a closed mold with compaction. The isocyanate semiprepolymers containing ester groups which can be used in this process are liquid at room temperature.