Title:
ポリアセタール共重合体の製造方法
Document Type and Number:
Japanese Patent JP5829718
Kind Code:
B2
Abstract:
A process for producing a polyacetal copolymer, the process making catalyst deactivation easy and efficient, requiring no cleaning step, merely requiring simple equipment and simple operation techniques, and rendering a high polymerization yield and high quality possible. In the invention, trioxane as a major monomer (a) is copolymerized with one or more comonomers (b) that are a cyclic ether and/or cyclic formal having at least one carbon-carbon bond, using a nonvolatile protonic acid as a polymerization catalyst (c) at a polymerization environment temperature of 100°C or lower until the conversion reaches 50% and thereafter at a polymerization environment temperature in the range of 115°C to 140°C. This process includes: a crushing step in which a dry-process crusher is used to obtain a crude polyacetal copolymer (d2) crushed to such a degree that when the crude copolymer (d2) is screened with a sieve having an opening size of 11.2 mm, 90 parts by weight or more thereof passes therethrough; and a deactivation step in which a basic compound (e) is added to the ingredient (d2) and the mixture is melt-kneaded to thereby deactivate the ingredient (c).
Inventors:
Horiguchi Tadahiro
Eiji Masuda
Eiji Masuda
Application Number:
JP2014071309A
Publication Date:
December 09, 2015
Filing Date:
March 31, 2014
Export Citation:
Assignee:
Polyplastics Co., Ltd.
International Classes:
C08G2/28
Domestic Patent References:
| JP9278852A | ||||
| JP2003026746A | ||||
| JP9100329A | ||||
| JP10101756A | ||||
| JP2000119357A | ||||
| JP2000119356A |
Attorney, Agent or Firm:
Masayuki Masabayashi
Hayashi Ichiyoshi
Hayashi Ichiyoshi
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