Method for preparing a latently reactive, pastly molding compound made from dimerized trimethylol propane, a prepolymer and an isocyanate compound

US5140089A · kind A · utility

Assignee

• Firma Carl Freudenberg · DE

Inventors

• Horst Muhlfeld · Fürth, DE
• Gunter Schuhmacher · Weinheim, DE
• Michael Hiller · Brighton, US
• Georg Schloer · Weinheim, DE

Key dates

• Filing date: Feb 1, 1991
• Grant date: Aug 18, 1992
• Expiry date: Feb 1, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T442/696
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A pasty molding compound, which is reactive only above room temperature and is intended for manufacturing temperature-resistant, elasticized duromer molded components, consists of a dimerized trimethylol propane (melting point 109.degree. C., molecular weight 250, OH number 900) and of 1 to 625 parts by weight (per 100 parts of methylene diphenyldiisocyanate) of low-molecular weight and an isocyanate-limited polyesterpolyol-diisocyanate-prepolymer, prepared from polycaprolactone and an isomeric mixture of the toluenediisocyanate. This masterbatch, which has an NCO excess of up to 15% over the equivalent quantity of the free OH components can be fortified with fillers and is moldable at low pressures. Furthermore, its application as an impregnating agent for glass-fiber mats to be molded is provided.