Process of integrating a photochromic substance into an ophthalm

Details Process of integrating a photochromic substance into an ophthalm Process of integrating a photochromic substance into an ophthalm

1979-01-10

1981-09-01

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Diffusion transfer dyeing process, transfer sheet and product

Dry heat treatment for penetration

8506, 8509, 8515, 351163, D06P 500, G03B 2146

Patent

active

042869579

ABSTRACT:
A process of integrating a photochromic substance, especially a spiropyran or a metal dithizonate, into a transparent substrate of polymerized organic material such as poly [ethylene glycol di-allyl di-carbonate] by thermal transfer, comprising applying the photochromic substance alone or with a solvent and/or thickening agent to the surface of a transparent organic substrate such as a lens disc, and heating until the photochromic substance is sublimed and then diffused and anchored in the organic material of the lens, preferably just beneath the surface to which it is applied. Preferably, the photochromic substance is initially carried on a temporarily support for application.

REFERENCES:
patent: 2715363 (1955-08-01), Hoover
patent: 4043637 (1977-08-01), Hovey
patent: 4059471 (1977-11-01), Haigh
patent: 4097230 (1978-06-01), Sandhu
patent: 4153412 (1979-05-01), Bailey

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