Title:
METHOD FOR PRODUCING POLYACETAL COPOLYMER
Document Type and Number:
WIPO Patent Application WO/2023/171315
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a method for producing a polyacetal copolymer, wherein molded products made of the polyacetal copolymer have good appearance and there is less variation between the products. The purpose of the present invention has been achieved by a method for producing a polyacetal copolymer, the method comprising at least the following steps in this order: (A) a step in which a main monomer (a) that is a trioxane, a comonomer (b) that is at least one selected from a cyclic formal and a cyclic ether and having at least one carbon-carbon bond, a protonic acid polymerization initiator (c), and optionally a molecular weight modifier (d1) are added and a polyacetal copolymer is polymerized with a polymerizer; (B) a step in which the polyacetal copolymer obtained in step (A) is removed from the polymerizer and the liquid molecular weight modifier (d2) having a boiling point of lower than 200°C is added to adjust the molecular weight of the polyacetal copolymer; and (C) a step for deactivating the polymerization initiator (c) following the step for adjusting the molecular weight.
Inventors:
MASUDA EIJI (JP)
Application Number:
PCT/JP2023/005672
Publication Date:
September 14, 2023
Filing Date:
February 17, 2023
Export Citation:
Assignee:
POLYPLASTICS CO (JP)
International Classes:
C08G2/04; C08G2/10; C08G2/18
Domestic Patent References:
| WO2014196385A1 | 2014-12-11 | |||
| WO2015008537A1 | 2015-01-22 |
Foreign References:
| JP6992144B1 | 2022-01-13 | |||
| JPH1112337A | 1999-01-19 | |||
| JP2000169668A | 2000-06-20 |
Attorney, Agent or Firm:
SHOBAYASHI Masayuki et al. (JP)
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