Water-swellable polymers having improved color

Details Water-swellable polymers having improved color Water-swellable polymers having improved color

1993-10-12

1995-05-16

Clark, W. Robinson

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

Synthetic resins

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

525244, 525301, C08L 2904, C08L 3302

Patent

active

054161606

ABSTRACT:
The subject invention pertains to a water-swellable polymer comprising the polymerization product of an .alpha.,.beta.-ethylenically unsaturated monomer in an aqueous phase, initiator, crosslinking agent, and polyvinyl alcohol, the polymerization product having been heated at a temperature greater than about 160.degree. C., wherein the polyvinyl alcohol is less than about 98 percent hydrolyzed, such that the polymerization product has improved whiteness.

REFERENCES:
patent: 4076663 (1978-02-01), Masuda et al.
patent: 4320040 (1982-03-01), Fujita et al.
patent: 4826917 (1989-05-01), Kondo et al.
patent: 4833222 (1989-05-01), Siddall et al.

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