Menicon Co., Ltd.

Shin-Etsu Chemical Co., Ltd.

Toyo Contact Lens Company, Limited

Nobuyuki Toyoshima

Hiroshi Yoshioka

Toshio Yamazaki

Ichiro Ando

Yasushi Yamamoto

Toru Kawaguchi

Tatsutoshi Nakajima

Takanori Shibata

Atsushi Hirashima

Akinari Itagaki

Kyoichi Tanaka

Noriko Iwata

Shinji Kanome

Masashige Yamanaka

Tatsutoshi Nakashima

Kazuhiko Nakada

Yasuomi Sasai

An ocular lens material comprising a copolymer prepared by polymerizing a monomer mixture comprising, as main components, (A) 15 to 40% by mole of a fluoroalkyl (silicon-containing alkyl) fumarate, (B) 10 to 50% by mole of a styrenic monomer, (C) 5 to 35% by mole of a hydrophilic monomer, and (D) 0.1 to 20% by mole of a crosslinkable monomer. The ocular lens material is excellent in all of transparency, oxygen permeability, mechanical strength and hardness. Further, the material is excellent in hydrophilic property in spite of its low water absorption.

Oxygen permeable hard contact lens materials comprising a

An ocular lens material comprising a copolymer prepared by polymerizing a monomer mixture comprising, as main components, (A) 15 to 40% by mole of a fluoroalkyl (silicon-containing alkyl) fumarate, (B) 35 to 55% by mole of an N-vinyl lactam, (C) 3 to 30% by mole of at least one of acrylic acid and methacrylic acid, and (D) 0.1 to 20% by mole of a crosslinkable monomer. The ocular lens material is excellent in all of transparency, oxygen permeability, mechanical strength and hardness. Further, the material is excellent in hydrophilic property in spite of its low water absorption.

Ocular lens material

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

Soft ocular lens material

A highly water-absorptive ocular lens material obtained by saponification for hydrophilic treatment of a copolymer composed essentially of:

Highly water-absorptive ocular lens material

A highly water-absorptive soft contact lens made of a copolymer comprising

High water-absorptive soft contact lens

A highly water-absorptive optical material obtained by saponification for hydrophilic treatment of a copolymer composed essentially of:

Highly water-absorptive optical material

A water-absorptive contact lens made of a copolymer comprising units of an ester of acrylic or methacrylic acid and at least one saccharide selected from D-galactose, D-glucose and D-mannose and units of at least one member selected from a hydrophilic monomer and a hydrophobic monomer, which has excellent oxygen permeability and affinity for the eye and can be worn continuously for a long period of time. The contact lens is prepared by polymerizing a monomer mixture containing an ester of acrylic or methacrylic acid with a ketalized saccharide and a hydrophilic monomer and/or a hydrophobic monomer, and after forming the resulting copolymer into a contact lens, if necessary, treating the copolymer having a shape of contact lens with an acid to convert the ketal groups into hydroxyl groups.

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Nagoya, Japan

Nobuyuki Toyoshima