Process for generation of squaric acid and for imaging, and imag

Details Process for generation of squaric acid and for imaging, and imag Process for generation of squaric acid and for imaging, and imag

1992-10-23

1994-08-02

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

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

Pretreatment processing before imaging, e.g., overall...

430333, 430336, 430203, 430269, 430270, G03C 1725, G03C 173, G03C 1735, G03C 500

Patent

active

053344898

ABSTRACT:
Acid can be generated by exposing a superacid precursor to actinic radiation effective to generate superacid from the superacid precursor and heating the superacid in admixture with a squaric acid derivative in which there is bonded to the squaric acid ring, via an oxygen atom, an alkyl or alkylene group, a partially hydrogenated aryl or arylene group, or an aralkyl group. The superacid catalyzes decomposition of the squaric acid derivative, thus increasing the quantity of strong acid present in the medium. The resultant acid can be used to effect a color change in an acid-sensitive material, so providing an imaging process.

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