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Ethylene vinyl alcohol copolymer pellets, resin composition, and multilayer structure

A technology of resin composition and vinyl alcohol, which is applied in the field of resin composition and multilayer structure, can solve the problems of lowering the quality of molded products, thermal deterioration, etc., and achieve the effect of difficult quality and excellent thermal stability

Active Publication Date: 2019-07-19
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to manufacture various molded products using this EVOH, melt molding such as extrusion molding and injection molding is carried out. Reduce the quality of molded products due to fisheye, gelatinous lumps (granules), etc.

Method used

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  • Ethylene vinyl alcohol copolymer pellets, resin composition, and multilayer structure
  • Ethylene vinyl alcohol copolymer pellets, resin composition, and multilayer structure
  • Ethylene vinyl alcohol copolymer pellets, resin composition, and multilayer structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0138] Hereinafter, although an Example is given and this invention is demonstrated more concretely, this invention is not limited to a following example unless the summary is exceeded.

[0139] In addition, in the following description, "part", "%", and "ppm" all refer to a weight basis. But "mol%" is directly "mol%".

[0140] In addition, each physical property was measured as follows.

[0141] (1) Quantification of the terminal structure of EVOH: NMR method

[0142]

[0143] Device name: (manufactured by AVANCEIII Bruker)

[0144] Observation frequency: 400MHz

[0145] Solvent: heavy water / ethanol-D6 [heavy water (35) / ethanol-D6 (65), weight ratio], DMSO-D6

[0146] Polymer Concentration: 5%

[0147] Measurement temperature: heavy water / ethanol-D6 70°C, DMSO-D6 50°C

[0148] Cumulative times: 16 times

[0149] Pulse repetition time: 4 seconds

[0150] Sample rotation speed: 20Hz

[0151] Additive: Trifluoroacetic acid

[0152]

[0153] (1-1) Determination of a...

reference example 1

[0184] A water / methanol mixed solution (water 35 / methanol 65, weight ratio, EVOH resin concentration 40%). Then, the solution of the EVOH intermediate is extruded into a water tank containing cold water in a strand form, cut off with a cutter after making it solidified, and obtains cylindrical EVOH intermediate pellets (100 parts relative to the EVOH intermediate, Contains 100 parts of water).

[0185] Then, put the above-mentioned EVOH intermediate pellets into an aqueous solution containing 350 ppm of acetic acid, 370 ppm of sodium acetate, 15 ppm of calcium dihydrogen phosphate, and 57 ppm of boric acid, and stir at 30 to 35° C. for 1 hour, then replace the aqueous solution. A total of 5 times of stirring treatment (chemical treatment process of the first stage) were carried out. In the aqueous solution used in the first-stage chemical treatment step, the weight ratio of the carboxylic acid concentration to the metal ion concentration of the metal carboxylate salt (carbox...

Embodiment 1

[0189] The amount of acetic acid in the aqueous solution in the second-stage chemical treatment process of Reference Example 1 was changed from 700 ppm to 1400 ppm, and the concentration of carboxylic acid in the aqueous solution used in the second-stage chemical treatment process was compared with that of the metal carboxylate. EVOH pellets were obtained in the same manner as in Reference Example 1 except that the weight ratio (carboxylic acid concentration / metal ion concentration) of the metal ion concentration was 13.5. Various measurement results of the obtained EVOH pellets are shown in Table 1 below.

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Abstract

Pellets that contain water and an ethylene vinyl alcohol copolymer. At end structures of the ethylene vinyl alcohol copolymer, the lactone ring content ratio (Y / Z) with respect to the total (Z) of thecarboxylic acid content (X) and the lactone ring content (Y) is at least 60 mol%. The water content of the pellets is no more than 0.5 wt%. The pellets have excellent thermal stability, e.g., excellent thermal decomposition resistance, even at high temperatures, and do not discolor or generate odors, even when processed at high temperatures.

Description

technical field [0001] The present invention relates to ethylene-vinyl alcohol-based copolymer pellets, and more specifically, to ethylene-vinyl alcohol-based copolymer pellets having excellent thermal stability at high temperatures as well as gas barrier properties, and the use of the pellets resin composition, multilayer structure. Background technique [0002] Ethylene-vinyl alcohol copolymers (hereinafter referred to as "EVOH"), especially saponified ethylene-vinyl acetate copolymers, are often used in films and sheets because of their excellent properties such as gas barrier properties and mechanical strength. , containers, fibers and other uses. [0003] In addition, the saponified product is produced by copolymerizing ethylene and vinyl acetate, removing unreacted vinyl acetate, and then saponifying the obtained ethylene-vinyl acetate copolymer. [0004] In order to manufacture various molded products using this EVOH, melt molding such as extrusion molding and injec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12B32B27/28C08F216/06C08L29/04
CPCB32B27/28C08F216/06C08J3/12C08F8/12B29B9/12B29B9/06B29B9/065B29B9/16C08F218/08C08F210/02C08F8/16C08F2500/24C08L29/04
Inventor 井上耕太桥本穗果佐藤伸昭
Owner MITSUBISHI CHEM CORP
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