Rapid hydrolysis of crosslinked maleic anhydride/lower alkyl vin

Details Rapid hydrolysis of crosslinked maleic anhydride/lower alkyl vin Rapid hydrolysis of crosslinked maleic anhydride/lower alkyl vin

1992-05-28

1993-10-19

Schofer, Joseph L.

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

Synthetic resins

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

424 70, 424 71, 514944, 525379, 525380, 525384, 525386, 526271, 528489, 528499, 528503, C08F 812, C08F 832, C08F 842, A61K 711

Patent

active

052546365

ABSTRACT:
This invention relates to a process which significantly reduces the time for hydrolyzing a crosslinked maleic anhydride/lower alkyl vinyl ether copolymer to a clear gel which comprises suspending or dispersing fine granules of the crosslinked copolymer in deionized water and agitating the resulting dispersion or suspension for a period of between about 15 and about 130 minutes at a temperature of from about 60.degree. to about 90.degree. C. and then cooling the hydrolyzed mixture before introducing a basic neutralizing agent at a temperature of from about 15.degree. to about 85.degree. C. to produce a clear, homogeneous hydrolyzed gel having a Brookfield viscosity of from 5,000 to 250,000 cps.

REFERENCES:
patent: 4874604 (1989-10-01), Sramek
patent: 4952558 (1990-08-01), Goertz
patent: 5024779 (1991-06-01), Helioff
patent: 5032391 (1991-07-01), Helioff

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