Resin composition and method for producing the same

Abstract

The present invention provides a resin composition which comprises EVOH and a thermoplastic resin other than EVOH and which generates less odor and therefore is suitable for food packaging applications. The invention also provides an environmentally friendly method for producing a resin composition, without releasing any carboxylic acid such as acetic acid to the peripheral environment. A resin composition containing less carboxylate group is obtained by contacting an ethylene-vinyl alcohol copolymer resin with an aqueous solution containing both carbon dioxide gas and at least one additive selected from the group consisting of an alkali metal salt (A) and a boron compound (B) and then melt kneading with a thermoplastic resin (G) other than EVOH.

Description

technical field

[0001] The present invention relates to a resin composition containing an ethylene-vinyl alcohol copolymer and a thermoplastic resin other than the ethylene-vinyl alcohol copolymer and a method for preparing the same. Background technique

[0002] Ethylene-vinyl alcohol copolymer (hereinafter referred to as EVOH) is a useful polymer material with good oxygen barrier properties, oil resistance, antistatic properties, mechanical strength, etc., and is widely used as various packaging materials such as films, plates, and containers. use. There are various methods of forming EVOH pellets into various molded products, and most of them are methods of melt-molding EVOH pellets such as extrusion molding or injection molding. However, usually in the molding process of EVOH resin, the melting temperature must be above 200 ° C, therefore, EVOH without additives is easy to age during melt molding, and fish eyes and plaques will occur on the product, which will cause pro...

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