Title:
PROCESS FOR PRODUCING POLYACETAL COPOLYMER
Document Type and Number:
WIPO Patent Application WO/2015/151342
Kind Code:
A1
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 (JP)
MASUDA EIJI (JP)
MASUDA EIJI (JP)
Application Number:
PCT/JP2014/082630
Publication Date:
October 08, 2015
Filing Date:
December 10, 2014
Export Citation:
Assignee:
POLYPLASTICS CO (JP)
International Classes:
C08G2/28
Foreign References:
| JPH09278852A | 1997-10-28 | |||
| JP2003026746A | 2003-01-29 | |||
| JPH09100329A | 1997-04-15 | |||
| JPH10101756A | 1998-04-21 | |||
| JP2000119357A | 2000-04-25 | |||
| JP2000119356A | 2000-04-25 |
Other References:
See also references of EP 3109266A4
Attorney, Agent or Firm:
SHOBAYASHI, Masayuki et al. (JP)
Right wood Masayuki (JP)
Right wood Masayuki (JP)
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