Vinyl alcohol copolymers for use in aqueous dispersions and...

Details Vinyl alcohol copolymers for use in aqueous dispersions and... Vinyl alcohol copolymers for use in aqueous dispersions and...

2011-04-26

2011-04-26

Cheung, William K (Department: 1762)

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

Synthetic resins

Polymerizing in two or more physically distinct zones

C526S067000, C526S303100, C526S310000, C526S330000

Reexamination Certificate

active

07932328

ABSTRACT:
A product comprising a cold water soluble film wherein: a) the film comprises a copolymer of vinyl alcohol (VOH) with a minor amount of 2-acrylamido-2-methyl propane sulfonic acid in free acid form or as a salt of the free acid (AMPS); and b) the film has a harsh chemical dissolution time of less than about 80 seconds measured by the harsh chemical dissolution test method after 8 weeks.

REFERENCES:
patent: 5229029 (1993-07-01), Colombo
Tohei Mortani et al., JP 62-33241 (English Translation) Jun. 1981.

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