Production process of multivalent metal-modified salicylic acid/

Details Production process of multivalent metal-modified salicylic acid/ Production process of multivalent metal-modified salicylic acid/

1988-08-04

1990-08-28

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

503210, 503211, 503212, 503216, 528205, 528206, 528392, C08G 8300

Patent

active

049526480

ABSTRACT:
Disclosed herein are novel multivalent metal-modified salicyclic acid resins useful as color-developing agents for pressure-sensitive copying paper. They can each be produced by causing a salicyclic acid ester and a styrene derivative to undergo a Friedel-Crafts reaction in the presence of a strong acid catalyst, hydrolyzing the resulting salicylic acid ester resin, and then reacting the thus-obtained salicyclic acid resin with a multivalent metal salt.

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patent: 4400492 (1983-08-01), Asano et al.
patent: 4704379 (1987-11-01), Shioi et al.
patent: 4748259 (1988-05-01), Nachbur

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