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Title:
ULTRA-PURE METHYL VINYL ETHER-CO-MALEIC ANHYDRIDE COPOLYMERS AND METHODS FOR PREPARING SAME
Document Type and Number:
WIPO Patent Application WO/2020/151009
Kind Code:
A1
Abstract:
Ultra-pure methyl vinyl ether-co-maleic anhydride (PMVE/MA) copolymers and the process to produce such ultra-pure polymers by removing trace impurities are provided. A process to provide an ultra-pure methyl vinyl ether-co-maleic anhydride material by solvent washing PMVE/MA copolymer with a solvent, comprises the steps of: (1) providing a solvent system in which impurities in the copolymer matrix are soluble and in which the PMVE/MA copolymer is not soluble, and wherein the solvent system does not react with the copolymer; (2) washing a dry powder or wet filter cake of PMVE/MA copolymer with the solvent system to efficiently and effectively extract trace impurities from the copolymer matrix; (3) filtering said copolymer from the solvent system; and (4) drying the subsequent wet filter cake of said copolymer to obtain an ultra-pure methyl vinyl ether-co-maleic anhydride copolymer.

Inventors:
ULMER HERBERT (CN)
WANG JIANQIANG (CN)
SUN XUDONG (CN)
Application Number:
PCT/CN2019/073231
Publication Date:
July 30, 2020
Filing Date:
January 25, 2019
Export Citation:
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Assignee:
BOAI NKY MEDICAL HOLDINGS LTD (CN)
International Classes:
C08F6/24; C08F6/00; C08F216/18; C08F222/06
Domestic Patent References:
WO1991004991A11991-04-18
WO2005010054A22005-02-03
Foreign References:
CN102030856A2011-04-27
US6881803B22005-04-19
US3499876A1970-03-10
Other References:
See also references of EP 3914627A4
Attorney, Agent or Firm:
KANGXIN PARTNERS, P.C. (CN)
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