Process for thermochemical generation of squaric acid and for th

Details Process for thermochemical generation of squaric acid and for th Process for thermochemical generation of squaric acid and for th

1992-10-23

1994-01-11

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Thermographic process

430333, 430336, 430346, 430203, 430269, 430270, 568347, G03C 516

Patent

active

052780317

ABSTRACT:
Certain squaric acid derivatives are useful for the thermochemical generation of acid. The squaric acid derivatives may be used in imaging media in conjunction with acid-sensitive materials which undergo a color change when contacted by the acid generated from the squaric acid derivatives. Preferably, the acid-sensitive materials undergo an irreversible color change, so that the image can be fixed by neutralizing all the acid generated with excess base, thereby preventing further color change in the image during long term storage.

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