Replication processes for producing plastic optical components

Details Replication processes for producing plastic optical components Replication processes for producing plastic optical components

1974-04-15

1976-01-06

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

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

264225, B29D 1100

Patent

active

039313735

ABSTRACT:
Polymeric replica molds formed from certain specific polymeric compositions are disclosed. The polymeric compositions impart properties to the replica molds which allow the casting of high-quality plastic optical components such as ophthalmic lenses.
Among the polymeric compositions which have been found useful are: (1) cross-linked polymethyl methacrylate; (2) a copolymer of 99-20 parts methyl methacrylate and 1-80 parts acrylonitrile, preferably but not necessarily cross-linked; (3) cross-linked polystyrene; (4) a cross-linked copolymer of 90-10 parts styrene and 10-90 parts acrylonitrile; and, (5) a cross-linked copolymer of 90-10 parts styrene and 10-90 parts methyl methacrylate.
Replication processes including the steps of forming the polymeric replica molds described herein and subsequently using them in the casting of plastic lenses from materials such as polymerized allyl diglycol carbonate are also disclosed.

REFERENCES:
patent: 3211811 (1965-10-01), Lanman
patent: 3380718 (1968-04-01), Neefe
patent: 3423488 (1969-01-01), Bowser
patent: 3497577 (1970-02-01), Wichterle
patent: 3699089 (1972-10-01), Wichterle
patent: 3806079 (1974-04-01), Beattie

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