Stabilized photochromic materials

Details Stabilized photochromic materials Stabilized photochromic materials

1975-01-27

1977-09-06

Morris, Theodore

Compositions: coating or plastic

Coating or plastic compositions

Carbohydrate or derivative containing

106DIG6, 252300, 260 4214, 260 37PC, 260 37R, 350160P, 351163, 428403, 428404, 428406, 428413, C08L 110, G02B 523

Patent

active

040465861

ABSTRACT:
Inorganic photochromic crystalline particles which are particularly useful in ophthalmic quality plastic host materials are formed for instance utilizing a silver halide crystal whose dimensions lie generally in the range between 30 Angstroms and 10,000 Angstroms. The surface of the silver halide crystal is coated with an inorganic material in an effective thickness to render the coating resistant to diffusion from within and to protect the crystal from interaction with host material. The stabilized coated particles can be introduced by known schemes into plastic host materials in order to form photochromic plastic articles useful in the preparation of films, sheets, filters for cameras, wall panels and ophthalmic lenses and other optical devices.

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