Photochromic ultraviolet protective shield

Details Photochromic ultraviolet protective shield Photochromic ultraviolet protective shield

1999-03-11

2000-09-05

Tucker, Philip

Compositions

Light transmission modifying compositions

Displaying color change

252589, 351163, 359885, G02B 523, G02B 522, F21V 904, G02C 710

Patent

active

061138134

ABSTRACT:
The present invention teaches a method for making a photochromic ultraviolet protective shield. The UV blocking eyewear uses a material which changes color when exposed to UV radiation. The obtained visible color is directly proportional to the intensity of ultraviolet light impinging the material. The photochromic ultraviolet protective shield is made by adjunction of photochromic compounds to a host polymer matrix. Incorporation of photochromics into a polymeric matrix involves the technique of injection molding, extrusion molding or cell-casting. This invention will offer the advantages i) to protect the eye or the face by absorbing the dangerous ultraviolet rays such as UV laser radiation ii) to reduce glare and squinting of the eye by automatically darkening in sunlight.

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patent: 5811503 (1998-09-01), Herold
patent: 5879591 (1999-03-01), Nagoh et al.

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