Soft contact lens with high moisture content and method for prod

Details Soft contact lens with high moisture content and method for prod Soft contact lens with high moisture content and method for prod

1997-08-04

1999-10-12

Merriam, Andrew E. C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

523108, 264 11, 264 26, 524548, 524555, 524558, 524916, G02C 704

Patent

active

059656301

ABSTRACT:
A method for producing moisture-containing soft contact lenses by polymerizing monomers for contact lenses in the presence of a diluent for monomers and substituting the diluent contained in the resulting polymer with an aqueous solution, wherein the diluent is composed of one or more compounds selected from the group consisting of triethylene glycol, diethylene glycol monomethyl ether and triethylene glycol monomethyl ether and a moisture-containing contact lens composed of a copolymer of the following main components, (1) two or more kinds of hydrophilic monomers selected from the group consisting of 2-hydroxyethyl methacrylate, N-vinyl-2-pyrrolidone and N,N-dimethylacrylamide, (2) an alkyl methacrylate and (3) a crosslinkable monomer, and an aqueous solution, which has a moisture content of 50-70% and exhibits a penetration strength of 1100 gf/mm or more. The contact lens of the present invention is optically transparent and exhibit excellent mechanical strength.

REFERENCES:
patent: 3699089 (1972-10-01), Wichterle
patent: 4680336 (1987-07-01), Larsen et al.
patent: 4866148 (1989-09-01), Geyer et al.
patent: 4889664 (1989-12-01), Kindt-Larsen et al.
patent: 5039459 (1991-08-01), Kindt-Larsen et al.

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