Crystals consisting of an indolinospirobenzopyran derivative

Details Crystals consisting of an indolinospirobenzopyran derivative Crystals consisting of an indolinospirobenzopyran derivative

1994-04-20

1995-04-04

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Dye image from radiation sensitive dye or dye former by dry...

Composition or product

430495, 430962, 430964, 252586, 3461351, G03C 1685

Patent

active

054037026

ABSTRACT:
The object of the invention is to provide a novel compound suited for use as a thermochromic and photochromic material.
The invention relates to an indolinospirobenzopyran derivative of the general formula ##STR1## [wherein R.sup.1 stands for C.sub.1-20 alkyl, aralkyl, methacryloxymethyl or methacryloxyethyl; R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 may for example be hydrogen; R.sup.8 may for example be hydrogen or methacryloxymethyl; Y may for example be oxygen or sulfur] and a process for producing the derivative.

REFERENCES:
patent: 3100778 (1963-08-01), Berman
patent: 3642484 (1972-02-01), Poot et al.
patent: 3785820 (1974-01-01), Inoue et al.
patent: 4405733 (1983-09-01), Williams et al.
English Language Abstract of JP 61-76490, Kakurai et al., (Apr. 1986).

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