Process for the manufacture of color developing material and pro

Details Process for the manufacture of color developing material and pro Process for the manufacture of color developing material and pro

1982-05-13

1983-10-11

Childs, Sadie L.

Stock material or miscellaneous articles

Structurally defined web or sheet

427144, 427145, 427146, 427150, 427326, 4273722, 4273978, 427411, 428537, 428913, 428914, B32B 500, B32B 700, B32B 2104

Patent

active

044092725

ABSTRACT:
Potassium hydroxide or another alkaline potassium compound is used to adjust the pH of an aqueous color developing clay coating composition in the manufacture of color developing material for use in pressure-sensitive or similar copying systems. This reduces the decline in reactivity with time of such material and increases initial print intensity compared with conventional material in which the corresponding sodium compound is used for pH adjustment. Especially good results are obtained where the material being coated is a paper of high acidity such as results from rosin/alum sizing.

REFERENCES:
patent: 2699432 (1955-01-01), Marra et al.
patent: 3682682 (1972-08-01), Bosshard et al.
patent: 3753761 (1973-08-01), Sugahara et al.
patent: 3856553 (1974-12-01), Hayashi et al.
patent: 3963852 (1976-06-01), Baxter
patent: 4020261 (1977-04-01), Oda et al.
patent: 4047738 (1977-09-01), Isaac et al.

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