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US 6,632,878 B1Granted
Production process for polymers with hydroxyl groups and polymers obtained by the process
AssigneeKuraray Co., Ltd.
InventorsYoichi Matsumoto, Naoki Fujiwara, Toshiaki Sato, Fumio Nakahara
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Abstract
A hydroxyl group containing polymer is prepared by a process, comprising: contacting the polymer having a substituent with high temperature, high pressure water, thereby converting the substituent to hydroxyl groups.
Claims8
A process, comprising:
- contacting a polymer having ester groups bound to the polymer backbone by an oxygen atom, or alkoxy groups, with water at a temperature ranging from 373 to 800° K and a pressure ranging from 0.1 to 62 Mpa, which converts the ester groups or alkoxy groups to hydroxyl groups, thereby forming a polyvinyl alcohol containing substantially no ash and which does not contain volatile organic compounds.
A process, comprising:
- contacting a poly(carboxylic acid vinyl ester), a poly(vinyl carboxylate) copolymer and a poly(vinyl alkyl ether) with water at a temperature ranging from 373 to 800° K and a pressure ranging from 0.1 to 62 Mpa, which converts the ester groups or alkoxy groups to hydroxyl groups, thereby forming a polyvinyl alcohol containing substantially no ash and which does not contain volatile organic compounds.
Dependencies are inferred from the claim text.