Radiation imagery chemistry: process – composition – or product th – Radiation modifying product or process of making
Patent
1983-01-06
1986-01-28
Kittle, John E.
Radiation imagery chemistry: process, composition, or product th
Radiation modifying product or process of making
2426, 2432, 350311, 350353, 351163, 428913, 430607, 430608, C09K 1500
Patent
active
045671222
ABSTRACT:
An irreversible phototropic material consists of a plasticized matrix in which is suspended a phototropic transition metal salt and an additive which inhibits the production of haze in the phototropic material. Generally the additive is a substance which inhibits the reduction of the transition metal in the transition metal salt from a higher to a lower oxidation level. Suitable substances include chelating agents such as oxalic acid, ethylenediamine and EDTA, and oxidizing agents, such as chromium trioxide. The transition metal salt is preferably copper (II) chloride or a mixture of copper (II) chloride and bromide, while the matrix is preferably polyvinyl chloride or polyvinyl chloride/polyvinylidene chloride copolymer.
These phototropic materials may be used in protective devices, such as goggles and windows, to protect objects or subjects against intense radiation.
REFERENCES:
patent: T861038 (1969-04-01), Newland et al.
patent: 3285746 (1966-11-01), Marks et al.
patent: 3322542 (1967-05-01), Fisher et al.
Baldry Peter J.
Collins John H.
Morantz Daniel J.
Overton Terence K. W.
Wright David W.
Kittle John E.
The Secretary of State for Defence in Her Britannic Majesty's Go
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