Menicon Co., Ltd.

Shin-etsu Chemical Co., Ltd.

Noriko Iwata

Toshio Yamazaki

Yasuhiro Yokoyama

Shoji Ichinohe

Ichiro Ando

Eri Ito

Hiroshi Yoshioka

Yasushi Yamamoto

Yasuo Tarumi

Kazuharu Niwa

Akinari Itagaki

Tsuyoshi Watanabe

Nobuyuki Toyoshima

Takanori Shibata

Yoshitaka Taniyama

Keiji Sugimoto

Naotaka Kamiya

Yasuhito Hishida

Atsushi Hirashima

Masanori Kadoya

Miyuki Kamiya

A water-absorptive soft contact lens comprising a polymer prepared by polymerizing a monomer mixture comprising (A) a fluorine-containing styrene derivative represented by the general formula (I): ##STR1## wherein R.sup.1 is hydrogen atom or methyl group, m is an integer of 1 to 3 and n is 0 or an integer of 1 to 7, and (B) N, N-dimethyl(meth)acrylamide. The water-absorptive soft contact lens has excellent oxygen permeability, high mechanical strength and excellent flexibility independent of water content.

Water-absorptive soft contact lens

A process for producing a tinted contact lens, which includes dissolving a soluble vat dye in a monomer capable of dissolving the soluble vat dye therein, mixing the monomer having the soluble vat dye dissolved therein and other monomers, polymerizing the monomer mixture and processing the resulting polymer into a shape of a contact lens.

Process for producing a tinted contact lens

1. A water-absorptive contact lens obtained by saponification of a copolymer composed essentially of:

Water-absorptive contact lens

An ocular lens material made of a copolymer consisting essentially of (A) a polysiloxane macromonomer having polymerizable groups bonded by one or more urethane bonds to the siloxane main chain and (B) an alkyl (meth)acrylamide, wherein the weight ratio of the polysiloxane macromonomer to the alkyl (meth)acrylamide ranges from 10:90 to 90:10.

Ocular lens material

A soft ocular lens material obtained by copolymerizing polymerizable components comprising (A) a fluorine-containing (meth)acrylate having a hydroxyl group of the formula (I): ##STR1## wherein R.sup.1 is a hydrogen atom or a methyl group, R.sup.2 is a C.sub.5-15 perfluoroalkyl group, and n is 0 or 1, (B) a hydrophilic monomer, and (C) at least one monomer selected from the group consisting of silicon-containing (meth)acrylates and siloxane-containing styrene derivatives, wherein the ratio of the amount of the fluorine-containing (meth)acrylate (A) to the amount of the hydrophilic monomer (B) is from 20/80 to 70/30 by weight ratio, and the ratio of the total amount of the fluorine-containing (meth)acrylate (A) and the hydrophilic monomer (B) to the amount of the monomer (C) is from 30/70 to 90/10 by weight ratio.

Soft ocular lens material

An ocular lens material made of a copolymer comprising, as main copolymerizable components, (A) a polysiloxane macromonomer having polymerizable groups bonded via one or more urethane bonds to the siloxane main chain and (B) an alkyl (meth)acrylamide, wherein the weight ratio of the polysiloxane macromonomer to the alkyl (meth)acrylamide is from 5/95 to 90/10.

A soft ocular lens material is formed of a copolymer consisting essentially of:

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Nagoya, Japan

Noriko Iwata