HIGH REFRACTIVE INDEX LENS AND METHOD FOR ITS PRODUCTION

Title:

HIGH REFRACTIVE INDEX LENS AND METHOD FOR ITS PRODUCTION

Document Type and Number:

WIPO Patent Application WO/1989/010575

Kind Code:

A1

Abstract:

This invention relates to a polysulfide resin lens and a method of its production comprising cast polymerisation of a mixture of an epoxy/episulfide resin having at least two epoxy groups and/or episulfide groups in one molecule, at least bifunctional polythiol and an internal mold releasing agent. The present invention provides a lens having excellent optical characteristics and high planar accuracy.

Inventors:

KANEMURA YOSHINOBU (JP)
SASAGAWA KATSUYOSHI (JP)
IMAI MASAO (JP)

Application Number:

PCT/JP1989/000454

Publication Date:

November 02, 1989

Filing Date:

May 01, 1989

Export Citation:

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Assignee:

MITSUI TOATSU CHEMICALS (JP)

International Classes:

C08G59/66; C08L63/00; C08L81/04; G02B1/04; (IPC1-7): G02B1/04

Foreign References:

JPS5987126A

1984-05-19

Other References: