Method of making a moulded photochromic lens

Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Composite or multiple layer

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264 18, 264 22, 264245, 2643287, 2643288, B29D 1100

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active

054055571

ABSTRACT:
A lens has two or more layered sections of thermosetting 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 thermosetting material; partially curing that material; changing the second mould half to define a subsequent mould cavity in which the partially cured material is present; loading the subsequent mould cavity with a subsequent thermosetting material; and curing the first and subsequent thermosetting materials. At least one of the thermosetting materials is loaded with an active photochromic material.

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