Method for preparing photochromic plastic article
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United States of America Patent
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-
Jul 14, 1992
Grant Date -
N/A
app pub date -
Mar 7, 1990
filing date -
Mar 7, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process for incorporating by thermal diffusion a photochromic substance into a synthetic organic host material is described. In the process, a surface of the host material containing a coating of a resin composition of from about 5 to about 50 parts of hydroxy (C.sub.2 -C.sub.3) alkyl cellulose, e.g., hydroxy propyl cellulose, and from about 95 to about 50 parts of poly(vinylpyrrolidone), which resin composition contains a photochromic substance, is heated to diffuse at least a portion of the photochromic substance into the surface of the host material. Subsequently, the coating is removed by washing with warm soapy water. In a particular embodiment, the host material is a polymer prepared from diethylene glycol bis(allyl carbonate).
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