Process for producing a contact lens

Details Process for producing a contact lens Process for producing a contact lens

1986-07-16

1989-06-13

Bleutge, John C.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Utilizing plasma, electric, electromagnetic, particulate, or...

522 5, 522 99, 526264, 526279, B29D 1100, C08F23008, C08F22018

Patent

active

048391093

ABSTRACT:
A mixture of a specified siloxanylalkyl ester monomer and a specified vinyl monomer is polymerized by exposure to an ionizing radiation at low temperatures and the resulting polymer is worked with a lathe cut to form a contact lens. The contact lens obtained is free from any optical distortion, has good dimensional stability and exhibits high oxygen permeability. In a preferred embodiment, a monomer mixture comprising a siloxanylalkyl ester, a methacrylate or acrylate, N-vinylpyrrolidone, and a small amount of a dimethacrylate or diacrylate is exposed to a total dose of 1.times.10.sup.5 -5.times.10.sup.6 roentgens at a low temperature (-80.degree. C. to -20.degree. C. and at a dose rate of 8.times.10.sup.4 -2.times.10.sup.6 roentgens per hour, and the resulting polymer is worked into a contact lens by a suitable forming process involving cutting, grinding and polishing operations.

REFERENCES:
patent: 3916033 (1975-10-01), Merrill
patent: 3983083 (1976-09-01), Kaetsu
patent: 4120570 (1978-10-01), Gaylord
patent: 4138300 (1979-02-01), Kaetsu
patent: 4248989 (1981-02-01), Novicky
patent: 4306042 (1981-12-01), Neefe
patent: 4330383 (1982-05-01), Ellis et al.

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