Bleaching and dyeing; fluid treatment and chemical modification – Treatment of hides – skins – feathers and animal tissues – Tanning
Patent
1976-10-12
1979-06-12
Griffin, Ronald W.
Bleaching and dyeing; fluid treatment and chemical modification
Treatment of hides, skins, feathers and animal tissues
Tanning
8 4, 8 17, 8DIG7, 96 49, 96 91R, 264 1, 351162, B29D 1100, D06P 300, G02C 704
Patent
active
041578929
ABSTRACT:
A method of coloring a water-absorbable plastic partially or totally in a single color or multiple colors in such a manner that no migration or separation of the coloring agents used can take place. A copolymer of a coupler monomer and a water-absorbable plastic monomer, a polymer of a coupler polymer and a water-absorbable plastic monomer or a polymer of a coupler monomer and a water-absorbable plastic polymer is formed into an intermediate product shaped in the form of any desired final product. The intermediate product is immersed in an aqueous solution of a developer consisting of a diazonium double salt and allowed to swell, whereby the diazo-component of the developer penetrates into the plastic. The swollen product is then immersed in an aqueous acid or alkaline solution having an optimum pH value for coupling reaction to allow formation of an azoic dye on the plastic as a result of the coupling reaction. A partially colored plastic is produced by application of ultraviolet rays to a portion or portions of the plastic on which no coloring is required, whereby the diazo-component on those portions is decomposed to leave those portions uncolored. Multiple coloring is effected by repeating the partial coloring process by changing diazonium double salts.
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Chemistry and Industry, Mar. 31, 1962, pp. 572-575.
Mio Takeshi
Takahashi Kozo
Tanaka Kyoichi
Yoshikawa Toshiharu
Griffin Ronald W.
Myers Kurt S.
Toyo Contact Lens Company, Limited
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