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Polyoxymethylene polymer pellets, process for manufacturing polyoxymethylene polymer pellets, and quality evaluation method for polyoxymethylene polymer pellets

A technology of polyoxymethylene and polymer particles, applied in the field of polyoxymethylene polymer particles, can solve the problems of insufficient improvement, difficulty in melting and uniform dispersion, lack of meltability, etc., and achieve the effect of inhibiting adhesion

Active Publication Date: 2014-02-05
POLYPLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the polymer composition proposed in Patent Document 1 does not sufficiently improve the problem of deposition of mold deposits, and furthermore, due to the lack of ability to capture formaldehyde, there is a concern that the formaldehyde may interfere with the working (hygienic) environment.
Furthermore, the melamine-formaldehyde condensation polymer has a networked molecular structure and lacks meltability, so it is difficult to melt and uniformly disperse in polyoxymethylene polymers
[0007] In addition, although the method for solving the above-mentioned problems is also disclosed in Patent Document 2, the polymer composition disclosed in Patent Document 2 is insufficient in improving the problem of mold deposits, and lacks formaldehyde capture ability.

Method used

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  • Polyoxymethylene polymer pellets, process for manufacturing polyoxymethylene polymer pellets, and quality evaluation method for polyoxymethylene polymer pellets
  • Polyoxymethylene polymer pellets, process for manufacturing polyoxymethylene polymer pellets, and quality evaluation method for polyoxymethylene polymer pellets

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Embodiment

[0090] The following examples are given to further describe the present invention, but the present invention is not limited to these examples.

[0091]

[0092] A-1: Polyacetal copolymer (MI=9g / 10min), the number of hemiformal terminal groups is 1.0mmol / kg, the number of formyl terminal groups is 2.0mmol / kg, and the weight of unstable terminal parts is 0.5% by mass polyoxymethylene copolymer

[0093] A-2: Polyacetal copolymer (MI=9g / 10min) subjected to hydrolysis treatment, the number of hemiformal terminal groups is 0.5mmol / kg, the number of formyl terminal groups is 1.0mmol / kg, unstable A polyoxymethylene copolymer having a terminal part weight of 0.25% by mass or less

[0094] A-3: Polyacetal copolymer (MI=27g / 10min), the number of hemiformal terminal groups is 1.0mmol / kg, the number of formyl terminal groups is 2.0mmol / kg, and the weight of unstable terminal parts is 0.5% by mass polyoxymethylene copolymer

[0095] A-4: Polyacetal copolymer (MI=27g / 10min) subjected to...

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Abstract

The present invention minimizes, during the molding of polymer pellets which comprise a polyoxymethylene polymer into molded parts, the adhesion of deposit onto a mold and the generation of formaldehyde. The present invention provides polyoxy- methylene polymer pellets which comprise (A) 100 parts by mass of a polyoxymethylene polymer, (B) 0.01 to 1.0 part by mass of a sterically hindered phenol antioxidant and (C) 0.01 to 0.10 part by mass total of melamine and methylol melamine and in which the content ratio of methylol melamine to the total of melamine and methylol melamine is so regulated as to fall within a specific range.

Description

technical field [0001] The present invention relates to polyoxymethylene polymer particles, a method for producing polyoxymethylene polymer particles, and a method for evaluating the quality of polyoxymethylene polymer particles. Background technique [0002] Polyoxymethylene polymers are one of engineering plastics having excellent mechanical strength, friction and wear characteristics, etc., and are used in various fields such as electrical and electronic equipment parts and automobile parts. The polyoxymethylene polymer is produced by polymerization of formaldehyde or trioxane which is a cyclic oligomer thereof, or copolymerization of trioxane and a comonomer such as cyclic ether or cyclic formal. [0003] The polyoxymethylene polymer produced as described above is easily decomposed, and when the polyoxymethylene polymer is decomposed, harmful gases such as formaldehyde are generated. Therefore, in order to suppress the decomposition of polyoxymethylene polymers, it is k...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/00B29B9/12C08J3/12C08K5/10C08K5/13C08K5/20C08K5/3492
CPCC08L59/00C08K5/13C08J3/126B29B9/12C08J2461/28C08K2201/014C08K5/34922C08J2359/00C08L59/02
Inventor 堀口忠洋
Owner POLYPLASTICS CO LTD