Carboxylic acid thickener having improved performance under alka

Details Carboxylic acid thickener having improved performance under alka Carboxylic acid thickener having improved performance under alka

1994-05-17

1995-12-12

Lipman, Bernard

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524555, 5253282, C08F 840

Patent

active

054750474

ABSTRACT:
An alkaline mixture of a cross-linked carboxylic acid copolymer having improved performance under alkaline conditions, such as a pH of 10 or higher which is a copolymer of a monomeric mixture of 6.5 to 97 phr of a carboxylic acid and 0.5 to 30 phr of an N-substituted acrylamide, such as isopropyl acrylamide, diacetone acrylamide, t-octylacrylamide, or t-butylacrylamide, which copolymer is cross-linked with 0.05 to 5 percent by weight based upon the weight of the copolymer of a polyunsaturated cross-linking agent, and an alkali or alkaline earth hydroxide, carbonate, phosphate or amine.

REFERENCES:
patent: 2798053 (1957-07-01), Brown
patent: 3493500 (1970-02-01), Volk et al.
patent: 3726288 (1973-04-01), Nowak et al.
patent: 4395524 (1983-07-01), Emmons et al.
patent: 4423199 (1983-12-01), Chang et al.
patent: 4566973 (1986-01-01), Masler, III et al.

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