Mitsubishi Gas Chemical Company, Inc.

Mitsubishi Engineering-plastics Corporation

Hisato Abe

Kenichi Takahashi

Osamu Aoki

Masanori Shimuta

Hiroyoshi Maruyama

Akira Kurata

Toru Takahashi

Haruo Sasaki

Kazuhiro Andou

The present invention provides a composition comprising a vinylbenzylthio compound represented by the following general formula ##STR1## in which m is an integer of 2-3, n is an integer of 1 and R is a hydrocarbon group of 3-6 carbon atoms or a hydrocarbon group of 3-6 carbon atoms containing a bivalent sulfur atom, and a monomer radical-copolymerizable with said vinylbenzylthio compound. Said composition is useful for producing a plastic lens having a high refractive index, a small specific gravity, excellent heat resistance and excellent processability.

Composition for high refractive index lens comprising copolymer of

The present invention provides a composition comprising, as the essential components, an aromatic compound represented by the following general formula ##STR1## (m is an integer of 2-3, n is an integer of 1-3 and R is a hydrocarbon group of 3-6 carbon atoms or a hydrocarbon group of 3-6 carbon atoms containing a bivalent sulfur atom), an isocyanate compound and a radical polymerization initiator. Said composition is useful for producing a plastic lens having a high refractive index, a small specific gravity, excellent heat resistance and excellent processability.

Composition for high refractive index lens comprising a copolymer of a

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Kashiwa, Japan

Hisato Abe