Ethylene-vinyl alcohol copolymer resin compound pellet clusters

A technology of resin composition and vinyl alcohol, which is applied in the field of ethylene-vinyl alcohol copolymer resin composition pellets, can solve the problems of reduced coloring and appearance of molded products, and achieve the effect of excellent long-term processability and reduced melt viscosity

Active Publication Date: 2018-08-03
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When EVOH resin is processed into films, sheets, etc., it is heated and melted using an extruder to form the desired shape. However, during the long-term melt molding process, the EVOH resin is deteriorated due to the heat history, and in the molding machine Colored matter and cross-linked matter are generated and mixed into the molded product, which may cause coloring of the molded product, fish eyes in the molded product, gel, etc., which may reduce the appearance, and it is required to improve the long-term processability of EVOH resin

Method used

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  • Ethylene-vinyl alcohol copolymer resin compound pellet clusters

Examples

Experimental program
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Embodiment 1

[0117] A water / methanol mixed solution (mixed weight ratio of water / methanol=35 / 65) of ethylene-vinyl alcohol copolymer [ethylene content 44 mol%, saponification degree 99.7 mol%, MI 12g / 10min (210°C, load 2160g)] , EVOH resin concentration 40%, solution temperature 60 ℃), extrude into coagulation bath (water / methanol=97 / 3 mixing weight ratio) groove with strand shape from cylindrical nozzle, after contacting in coagulation bath, The strands were pulled out from the coagulation bath, and the strands were cut with a cutter to obtain white porous cylindrical pellets with a diameter of 3.7 mm and a length of 4 mm.

[0118] Next, the EVOH resin pellets were washed with warm water at 35°C to obtain EVOH resin pellets with a water content of 58%. In addition, the obtained EVOH resin pellets were put into 30 parts containing 0.005 parts of sodium acetate (in terms of metal), 0.1 part of acetic acid, 0.004 parts of boric acid (in terms of boron), and 0.002 parts of magnesium acetate (...

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Abstract

The present invention provides ethylene-vinyl alcohol copolymer resin compound pellet clusters with superior workability over an extended period of time, said ethylene-vinyl alcohol copolymer resin compound pellet clusters containing an ethylene-vinyl alcohol copolymer and a divalent metal salt, and no more than 3% of the total number of individual pellets having a b* value of 5 or greater after being heat-treated for 30 minutes at 230 DEG C.

Description

technical field [0001] The present invention relates to an ethylene-vinyl alcohol-based copolymer resin composition pellet set, and more specifically, to an ethylene-vinyl alcohol-based copolymer resin composition pellet set excellent in long-term processability during melt molding. Background technique [0002] Conventionally, ethylene-vinyl alcohol-based copolymers (hereinafter sometimes referred to as "EVOH resins") have very strong intermolecular forces due to hydrogen bonds between hydroxyl groups present in polymer side chains. Therefore, since the crystallinity is high and the intermolecular force is high even in the amorphous part, gas molecules etc. do not easily pass through the EVOH resin, and a film using the EVOH resin exhibits excellent gas barrier properties. [0003] Taking advantage of this excellent gas barrier property, EVOH resin is used as a film, sheet, or container such as a food packaging material, pharmaceutical packaging material, industrial chemica...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C08L29/04C08K5/09
CPCC08L29/04C08K5/098B29B9/06B29B9/065B29B9/12C08K5/09
Inventor中岛彩乃田边孝路佐藤伸昭横矢荣作本田盛一井上馨
OwnerMITSUBISHI CHEM CORP