Process of making optical blanks

US4715999A · kind A · utility

Assignee

• Schott Glaswerke · DE

Inventors

• Helmut Dislich · Budenheim, DE
• Nanning Joerg Arfsten · Ockenheim, DE
• Helmut Schmidt · Riegelsberg, DE
• Gottfried Philipp · Kist, DE
• Gerhard Tuenker · Würzburg, DE

Key dates

• Filing date: Nov 8, 1985
• Grant date: Dec 29, 1987
• Expiry date: Nov 8, 2005

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C45/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Optical blanks, for example spectacle lenses, are produced by hot-blank pressing or injection molding of polyorganoheterosiloxanes which are obtainable by hydrolytic polycondensation of at least one titanium-, zirconium-or tin-compound, at least one organofunctional silane and, where applicable, at least one inorganic oxide component. For control of the optical characteristics and working properties, polyorganoheterosiloxanes which have a polymerizable organic radical may be modified by additional polymerization with other copolymerizable condensates or monomers.