Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Utilizing plasma – electric – electromagnetic – particulate – or...
Patent
1975-03-17
1977-05-10
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Utilizing plasma, electric, electromagnetic, particulate, or...
20415922, 20415923, 264 22, 264311, 264347, B29C 504, B29D 1100
Patent
active
040228550
ABSTRACT:
A centrifugal molding method is provided for making a plastic lens having a gradient index of refraction. A reusable silicone rubber mold is placed in a rotatable mold carrier and two copolymerizable monomer compositions containing monomers having different indices of refraction are combined in the mold to form a polymerization mixture which has an index of refraction varying radially outward from its axis of rotation. The first monomer composition is placed in the mold and, while the mold is rotating sufficiently to force the first monomer composition to the outside edge of the mold, a second monomer composition is introduced via hypodermic injection into the center of the mold. The speed of rotation is reduced and the two monomer compositions diffuse one into the other in a controllable manner. Ultraviolet exposure, either directly on the mold or variably through a photographic mask with varying density, modifies the diffusion by initiating polymerization and increasing the viscosity of the monomer compositions. Finally the monomer compositions in the mold are completely polymerized by heat curing in an oven.
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Anderson Philip
Eastman Kodak Company
Husser John D.
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