Dispersant for suspension polymerization and method for producing vinyl-based polymer
By using vinyl alcohol-based polymer dispersants with specific structures and properties, the problems of insufficient particle size and plasticizer absorption of vinyl polymer particles in the prior art have been solved, and high-quality polymer particles can be obtained with a small amount of dispersant.
CN116438208BActive Publication Date: 2026-06-02KURARAY CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- KURARAY CO LTD
- Filing Date
- 2021-10-29
- Publication Date
- 2026-06-02
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Figure CN116438208B_ABST
Abstract
Provided are a dispersant for suspension polymerization and a method for producing a vinyl polymer, which are capable of obtaining polymer particles having a small average particle diameter and a small amount of coarse particles and good plasticizer absorbency even at a small amount. The dispersant for suspension polymerization includes a vinyl alcohol-based polymer having a structure represented by the following formula (1) and satisfying the following formula (2). In formula (1), R is a hydrocarbon group having 4 or more carbon atoms. In formula (2), [X] is the content ratio (mol%) of the structure represented by formula (1) in the aforementioned vinyl alcohol-based polymer with respect to the total structural units, and [R a，1 ] is the HSP distance ((J / cm 3 ) 1 / 2 ) between the structure represented by formula (1) and vinyl chloride. 0.4 ≤ [X] × 10 2 / [R a，1 ] 2 ≤ 3.0 (2).
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