Rapid hydrolysis of crosslinked maleic anhydride/lower alkyl vinyl ether copolymers

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...

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Bibliographische Detailangaben
Hauptverfasser:	KWAK, YOON T, KOPOLOW, STEPHEN L
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON HUMAN NECESSITIES HYGIENE MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS MEDICAL OR VETERINARY SCIENCE METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES SPECIFIC USE OF COSMETICS OR SIMILAR TOILETPREPARATIONS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	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 DEG to about 90 DEG C. and then cooling the hydrolyzed mixture before introducing a basic neutralizing agent at a temperature of from about 15 DEG to about 85 DEG C. to produce a clear, homogeneous hydrolyzed gel having a Brookfield viscosity of from 5,000 to 250,000 cps.