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US 4,238,562 AGranted
Light transmission particle for forming color image
AssigneesHodogaya Chemical Co., Ltd., Matsushita Electric Industrial Co., Ltd.
InventorsEisuke Ishida, Yuji Takashima, Hisanori Nishiguchi, Yoshihide Miyazawa, Shigeru Endo
Life of this patent
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Abstract
Disclosed is a light transmission particle containing a colorless sublimable dye that is a spirobenzopyrane indole compound suitable for use in the formation of a color image. This particle can produce a clear color image having little fogging and having an excellent resolving power.
Claims13
A light transmission particle for forming a color image comprising
- (a) 100 parts by weight of a transparent resin binder,
- (b) about 0.3 to about 30 parts by weight of at least one spirobenzopyrane indole compound having a general formula I:
- ##STR9## wherein R.sub.1 and R.sub.2 independently represent a methyl, ethyl, or phenyl group and X represents hydrogen, a methyl group or a halogen atom, and
- (c) about 0.1 to about 50 parts by weight of at least one coloring agent.
1 more element
Dependencies are inferred from the claim text.