Method of making a moulded photochromic lens

Details Method of making a moulded photochromic lens Method of making a moulded photochromic lens

1994-03-10

1996-06-04

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Composite or multiple layer

264 22, 2643287, 2643288, B29D 1100

Patent

active

055230300

ABSTRACT:
A lens has two or more layered sections of thermoplastic material, and a substantially homogenous formation in which at least one of the layered sections has an active photochromic material present. The article is made by: forming a mould cavity from first and second mould halves; loading the mould cavity with a first thermoplastic material; curing or partially curing that material; changing the second mould half to define a subsequent mould cavity in which the cured or partially cured material is present; loading the subsequent mould cavity with a subsequent thermoplastic material; and completing any uncompleted curing of the first and subsequent thermoplastic materials. At least one of the thermoplastic materials is loaded with an active photochromic material.

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