Water strippable photochromic resin composition

Details Water strippable photochromic resin composition Water strippable photochromic resin composition

Filed on

1991-12-06

Date issued

1993-02-09

Examiner

Nutter, Nathan M.

Patent Class

Synthetic resins or natural rubbers -- part of the class 520 ser

SubClass

Synthetic resins

SubSubClass

Processes of preparing a desired or intentional composition...

Other Related Categories

524 44, C08L 126

Type

Patent

Status

active

Patent number

051853906

Description

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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patent: 4692454 (1987-09-01), Mich et al.
patent: 4720356 (1988-01-01), Chu
patent: 4986934 (1991-01-01), Kwiatkowski

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