Phototropic dye system and photosensitive compositions containing the same
AssigneeDynachem Corporation
InventorsToshio Yamazaki, Harriet J. Cook, Melvin A. Lipson
Life of this patent
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Abstract
The free bases of various amino dyestuffs, such as the amino derivatives of triarylmethane and xanthene dyestuffs form stable solutions with organic halides and a matrix, such as a film-forming binder. Dry films of such compositions are lightly colored; upon exposure to actinic light, the dyestuffs become intensely colored. The combination of dyestuff free base and organic halide is particularly useful in conjunction with photopolymerizable compositions to denote the polymerized portions of a dry film photoresist and to enable the use of thicker films or coatings of liquid photopolymerizable compositions than were previously useful.
Claims29
A stable photopolymerizable composition comprising:
- a. an acrylyl or methacrylyl compound thereof capable of forming a high polymer by free radical initiated polymerization;
- b. a free-radical generating addition polymerization initiator activatable by actinic radiation;
- c. the free base of a dyestuff whose halide salt is more intensely colored than the free base;
- and
- d. the normally solid amide of a halogenated aliphatic carboxylic acid that releases halide free radicals upon exposure to actinic light.
Dependencies are inferred from the claim text.