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...
Patent
1982-11-17
1987-05-05
Michl, Paul R.
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...
C08L 2708
Patent
active
046633855
ABSTRACT:
There is disclosed a process of thickening an aqueous system comprising adding to the system aqueous dispersions of water-insoluble emulsion copolymers of (1) about 10-70% by weight of (meth)acrylic acid or itaconic acid, (2) about 0.5-25% by weight of an alkyl poly(oxyethylene) itaconate, and (3) at least 25% by weight, to a total of 100%, of a C.sub.1 -C.sub.4 alkyl (meth)acrylate, and, optionally, included in the total monomer mixture a small amount of (4) about 0.05-1% by weight of a polyethylenically unsaturated monomer. The copolymers, when neutralized and solubilized by addition of an alkali, are high efficiency thickeners for aqueous systems and have improved tolerance to ionic or electrolyte content. Typical systems that can be thickened are paint latices, cosmetic preparations, food preparations, ionic detergents, dye pastes for textiles, pharmaceuticals, and oil well drilling muds. Surfactants enhance the thickening properties afforded by the copolymers.
REFERENCES:
patent: 2798053 (1957-07-01), Brown
patent: 3708445 (1973-01-01), Junas et al.
patent: 4075411 (1978-02-01), Dickstein
patent: 4138381 (1979-02-01), Chang et al.
patent: 4268641 (1981-05-01), Koenig et al.
Chang Ching-Jen
Stevens Travis E.
Michl Paul R.
Rohm and Haas
Sluzas Alex R.
Walker Alex H.
Winters Douglas E.
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