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Method for producing polyacetal copolymer

A technology of polyacetal copolymer and manufacturing method, which is applied in the field of polyacetal copolymer manufacturing to achieve the effect of high quality and stability

Active Publication Date: 2020-10-13
POLYPLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, boron trifluoride-based compounds are complicated by the deactivation treatment of the catalyst. Therefore, as a catalyst replacing it, a method for producing a polyacetal copolymer using a heteropolyacid as a catalyst has been proposed (for example, Patent Document 1)

Method used

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  • Method for producing polyacetal copolymer
  • Method for producing polyacetal copolymer
  • Method for producing polyacetal copolymer

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Embodiment

[0057] Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to them.

[0058] [Manufacture of polyacetal copolymer of trioxane as main monomer (a) and comonomer (b)]

[0059] Polymerization was carried out as follows to produce a polyacetal copolymer.

[0060] 300 g of (a) trioxane, 11 g of 1,3-dioxolane as the (b) component, and 0.2 g of formaldehyde of the agent was condensed, and these contents were stirred, and warm water of 80°C was passed through the jacket to maintain the internal temperature at about 80°C. Thereafter, the catalyst solution (catalyst 0.3% by mass of methyl formate solution), polymerization was started.

[0061] After 5 minutes, 300 g of water containing 0.1% of triethylamine was added to the autoclave to stop the reaction, the contents were taken out and pulverized to 200 mesh or less, washed with acetone and dried, and the yield of polyacetal copolymer was calculated (The ratio (%) of the copolymer ...

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Abstract

The purpose of the present invention is to provide a method for producing a polyacetal copolymer, in which any disturbances in mass production less affect the polymerization. The method is for producing a polyacetal copolymer from trioxane as a main monomer (a) and a comonomer (b) copolymerizable therewith, and comprises using a polymerization catalyst (c) obtained by mixing a heteropolyacid (B) represented by general formula (1) with a heteropolyacid salt (A) represented by general formula (2) in a mass ratio of 10>=(A) / (B)>=0.2. H<m>[M<1]<x>*M<2><y>O<z>]*nH<2>O ...(1), M<3><m>[M<1><x>*M<2><y>O<z>]*nH<2>O... (2). [In formulae (1) and (2), M<1> represents one or two central elements selected from between P and Si, M<2> represents one or more coordination elements selected from among W, Mo,and V, M<3> represents an alkali metal, x is an integer of 1-10, y is an integer of 6-40, z is an integer of 10-100, m is an integer of 1 or larger, and n is an integer of 0-50.]

Description

technical field [0001] The present invention relates to a method for producing polyacetal copolymers. Background technique [0002] Conventionally, cationic copolymerization of trioxane as a main monomer and a comonomer (b) copolymerizable therewith is known as a method for producing a polyacetal copolymer. As the cationic active catalyst used in these copolymerizations, boron trifluoride or boron trifluoride and organic compounds, such as coordination compounds with ethers, are the most common polymerization catalysts with trioxane as the main monomer, It is also widely used in industry. [0003] However, boron trifluoride-based compounds are complicated by the deactivation treatment of the catalyst. Therefore, as a catalyst replacing it, a method for producing a polyacetal copolymer using a heteropolyacid as a catalyst has been proposed (for example, Patent Document 1). [0004] Due to its high activity, heteropolyacids can be polymerized with a very small amount of cat...

Claims

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Application Information

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IPC IPC(8): C08G2/06C08G2/10
CPCC08G2/10C08G2/06
Inventor 喜来直裕增田荣次
Owner POLYPLASTICS CO LTD
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