Title:
OXYMETHYLENE-COPOLYMER MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2019/053976
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a method for manufacturing an oxymethylene copolymer in which the amount of formaldehyde generated from a product thereof is reduced; in particular, the amount of formaldehyde generated from a product when stored in a high-temperature, high-humidity environment for a long period of time is reduced, and thus, the generation of an offensive odor is suppressed. It is possible to solve the aforementioned problem by means of an oxymethylene-copolymer manufacturing method comprising: a step 1 for polymerizing a polymerization raw material containing trioxane and a comonomer in the presence of an acid catalyst in a quantity that is 1.0×10-8 moles to 5.0×10-6 moles with respect to 1 mole of trioxane; a step 2 for adding a hydroxylamine compound represented by general formula (1) (in the formula, R1 and R2 are, independently of each other, a hydrogen atom or an organic group having 1-20 carbon atoms) to a reaction product obtained in step 1 at 50-5000 times the quantity of the acid catalyst, in terms of the molar quantity, and mixing the hydroxylamine compound with the reaction product; and a step 3 for subjecting the mixture of the reaction product and the hydroxylamine compound, which is obtained in step 2, to an additional melt-kneading.
Inventors:
YAMAMOTO YUUTA (JP)
SUNAGA DAISUKE (JP)
OKADA TAKUYA (JP)
SUNAGA DAISUKE (JP)
OKADA TAKUYA (JP)
Application Number:
PCT/JP2018/022442
Publication Date:
March 21, 2019
Filing Date:
June 12, 2018
Export Citation:
Assignee:
MITSUBISHI GAS CHEMICAL CO (JP)
International Classes:
C08G2/28; C08K5/32; C08L59/00
Domestic Patent References:
| WO2015005169A1 | 2015-01-15 | |||
| WO2013172270A1 | 2013-11-21 | |||
| WO2017159602A1 | 2017-09-21 | |||
| WO2013094393A1 | 2013-06-27 |
Foreign References:
| JPS5834819A | 1983-03-01 | |||
| JP39006390B | ||||
| JPH1135791A | 1999-02-09 | |||
| JPH0235772B2 | 1990-08-13 | |||
| JP2000290334A | 2000-10-17 | |||
| JPH08208784A | 1996-08-13 | |||
| JP2010070222A | 2010-04-02 |
Other References:
See also references of EP 3683247A4
Attorney, Agent or Firm:
KOBAYASHI Hiroshi et al. (JP)
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