Invention Grant
- Patent Title: Saponification product of vinyl ester/ethylenically unsaturated carboxylic acid ester copolymer and process for producing the same
- Patent Title (中): 乙烯基酯/烯键式不饱和羧酸酯共聚物的皂化产物及其制备方法
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Application No.: US14117417Application Date: 2012-05-01
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Publication No.: US09150679B2Publication Date: 2015-10-06
- Inventor: Tomoaki Yamasaki , Yuji Kinpara , Shigeki Hamamoto
- Applicant: Tomoaki Yamasaki , Yuji Kinpara , Shigeki Hamamoto
- Applicant Address: JP Hyogo
- Assignee: SUMITOMO SEIKA CHEMICALS CO., LTD.
- Current Assignee: SUMITOMO SEIKA CHEMICALS CO., LTD.
- Current Assignee Address: JP Hyogo
- Agency: Westerman, Hattori, Daniels & Adrian, LLP
- Priority: JP2011-110483 20110517
- International Application: PCT/JP2012/061550 WO 20120501
- International Announcement: WO2012/157450 WO 20121122
- Main IPC: C08F216/06
- IPC: C08F216/06 ; C08J3/12
Abstract:
The present invention provides a saponification product of a vinyl ester/ethylenically unsaturated carboxylic acid ester copolymer having superior tolerance of the aqueous thickening liquid against mechanical shear. More specifically, the present invention provides a saponification product of a vinyl ester/ethylenically unsaturated carboxylic acid ester copolymer having the superior tolerance, by polymerizing a mixture where the molar ratio of the vinyl ester/ethylenically unsaturated carboxylic acid ester is from 8/2 to 3/7, and saponifying the obtained copolymer in a mixed solvent where the mass composition ratio of an aqueous organic solvent/water mixture solvent is from 3/7 to 8/2.
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