Heat-hardening reaction resin mixture for impregnating insulation of electrical equipment and for the manufacture of molding materials with and without inserts

US4636556A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Walter Ihlein · Berlin, DE
• Wolfgang Rogler · Erlangen, DE

Key dates

• Filing date: Sep 10, 1985
• Grant date: Jan 13, 1987
• Expiry date: Sep 10, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/637
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A heat-hardenable reaction resin mixture including a polyisocyanate; a polyepoxy resin and an olefinically unsaturated compound having no active hydrogen atoms. Addition complexes of tertiary amines and boron trichloride having the general formula BCl.sub.3.NR.sub.1 R.sub.2 R.sub.3 are used as accelerators. Polymerizate inhibitors may also be added. The mixture is very storage-stable and hardens in short times (quickly) at elevated temperatures. The molding materials obtained in this manner are highly resistant to thermal aging.