Method and mold for molding plastic lenses

Details Method and mold for molding plastic lenses Method and mold for molding plastic lenses

2005-01-18

2005-01-18

Vargot, Mathieu D. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Changing mold size or shape during molding or with shrinkage...

C264S002500, C425S808000, C425S812000

Reexamination Certificate

active

06843940

ABSTRACT:
A method for making an organic glass lens or lens blank which comprises providing a two-piece mold defining a molding cavity having a vertical axis which is part of a fixed reference system comprising said vertical axis and a horizontal axis which intersects at the center of the mold, a liquid tight annular closure member disposed at the periphery of the mold pieces for maintaining the two mold pieces and closing the molding cavity, wherein the annular closure member comprises at least a portion thereof made of a material that is initially gas permeable but becomes gas impermeable when in contact with a liquid polymerizable composition.

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