Invention Grant
- Patent Title: Dispersion assistant for suspension polymerization and method for producing vinyl-based polymer using the same
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Application No.: US16343377Application Date: 2017-10-17
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Publication No.: US11339232B2Publication Date: 2022-05-24
- Inventor: Takehiro Omori , Yoshiaki Kozuka
- Applicant: Japan Vam & Poval Co., Ltd.
- Applicant Address: JP Osaka
- Assignee: Japan Vam & Poval Co., Ltd.
- Current Assignee: Japan Vam & Poval Co., Ltd.
- Current Assignee Address: JP Osaka
- Agency: Knobbe Martens Olson & Bear LLP
- Priority: JP2016-215717 20161102
- International Application: PCT/JP2017/037486 WO 20171017
- International Announcement: WO2018/083968 WO 20180511
- Main IPC: C08F8/12
- IPC: C08F8/12 ; C08F8/28 ; C08F16/06 ; C08F18/08 ; C08F14/06 ; C08L29/04 ; C08L29/14 ; C08F2/20
Abstract:
Provided is a dispersion assistant useful for suspension polymerization of vinyl-based compounds. The dispersion assistant comprises a polyvinyl alcohol-based polymer (A) comprising a constituent unit represented by the general formula (1) shown below at 0.1 to 10 mol % per polyvinyl alcohol monomer unit and having a saponification degree of 15 to 70 mol %. (In the formula, R denotes an alkyl group.)
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