Method for producing a shaped piece suitable for optical purposes

US6162853A · kind A · utility

Assignee

• Institut fuer Neue Materialien gemeinnuetzige GmbH · DE

Inventors

• Bert Braune · Völklingen, DE
• Elisabeth Geiter · Riegelsberg, DE
• Herbert Krug · Ludwigshafen, DE
• Peter Mueller · Zürich, CH
• Helmut Schmidt · Riegelsberg, DE

Key dates

• Filing date: Jan 25, 1999
• Grant date: Dec 19, 2000
• Expiry date: Jan 25, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B1/041
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Described is a process for preparing a molding suitable for optical purposes, which process comprises the conjoint free-radical polymerization of a precondensate (A) which is derived from at least one hydrolytically condensable silane (a) having at least one free-radically polymerizable group X, and of a monomer (B) having at least two free-radically polymerizable groups Y, the numerical ratio of groups X to groups Y being not greater than 5:1. The moldings obtainable by this process are characterized by high transparency and homogeneity, freedom from stress, scratch and abrasion resistance, high mechanical strength, etc.