High index curable photochromic composition and its process

US6933325B2 · kind B2 · utility

Assignee

• RODENSTOCK GMBH · DE

Inventors

• Qiang Zheng · Palo Alto, US
• Donald S. Nelson, Jr. · Akron, US
• Charles William Carper, Jr. · Westerville, US
• Manfred Melzig · Weßling, DE
• Herbert Schuster · Grafing, DE
• Herbert Zinner · Pentling, DE

Key dates

• Filing date: Oct 11, 2002
• Grant date: Aug 23, 2005
• Expiry date: Nov 7, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F222/102
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A high refractive index, curable, synthetic resin composition comprising a core resin composition composed of a mixture of ethylenically unsaturated compounds, and an initiation system containing both photo and thermal initiators, particularly a photochromic resin composition which further includes at least one photochromic dye. Also a curing process, which includes a combination of multi-step radiation curing and thermal annealing. Articles produced of cured composition exhibit superior physical and, in appropriate cases, photochromic properties and can be easily mass produced on a commercial scale due to short processing time and use of readily available chemicals.