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Resin composition and method for producing the same

一种树脂组合物、热塑性树脂的技术，应用在热塑性树脂的树脂组合物领域，能够解决透明性降低等问题，达到散发臭味少、熔融稳定性和长期使用性优异的效果

Inactive Publication Date: 2005-05-18
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the disadvantage of greatly reducing the transparency

Method used

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  • Resin composition and method for producing the same
  • Resin composition and method for producing the same
  • Resin composition and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0333] [Manufacture of EVOH resin composition (F)]

[0334] The 45% methanol solution of the ethylene-vinyl acetate copolymer with 50kg ethylene content of 32 mol % and the methyl alcohol of 129kg are packed in the saponification reactor of 470L capacity, while blowing into nitrogen in the reactor, internal temperature is set on the one hand Set at 60°C. Further, 29 L of methanol solution of sodium hydroxide (concentration: 80 g / L) was added thereto to start saponification reaction. During the saponification reaction, in order to improve the reaction efficiency, nitrogen is continuously blown into the reactor, so that the methyl acetate produced as a by-product in the reaction system is driven out of the reaction system together with the methanol in the reaction system. Based on the total amount of methyl acetate and methanol, the drive-out rate is about 20kg / hr. Use a condenser to condense and recover the drive-out liquid. After 2 hours from the start of the reaction, 29 L ...

Embodiment 2

[0349] [Preparation of EVOH resin composition (F)]

[0350] Be that 45% methanol solution of the ethylene-vinyl acetate copolymer of 27 mol % with 50kg ethylene content and the methyl alcohol of 129kg pack in the saponification reactor of 470L capacity, blow into nitrogen in the reactor on one side, set internal temperature to Set at 60°C. Further, 29 L of methanol solution of sodium hydroxide (concentration: 80 g / L) was added thereto to start saponification reaction. During the saponification reaction, in order to improve the reaction efficiency, nitrogen is continuously blown into the reactor, so that the methyl acetate produced as a by-product in the reaction system is driven out of the system together with the methanol in the reaction system. Based on the total amount of methyl acetate and methanol, the drive-out rate is about 20kg / hr. Use a condenser to condense and recover the drive-out liquid. After 2 hours from the start of the reaction, 29 L of methanol solution of ...

Embodiment 3

[0370] [Preparation of Modified EVOH (G3)]

[0371] Modified EVOH (G3) was prepared according to the method described below. The raw material EVOH and the resulting modified EVOH (G3) were analyzed in accordance with the method described in International Publication No. 02 / 092643 pamphlet.

[0372] 28 parts by weight of zinc acetylacetonate hydrate and 957 parts by weight of 1,2-dimethoxyethane were mixed to obtain a mixed solution. While stirring, 15 parts by weight of trifluoromethanesulfonic acid was added to prepare a catalyst solution. That is, a solution in which 1 mol of trifluoromethanesulfonic acid was mixed with 1 mol of zinc acetylacetonate hydrate was prepared.

[0373] EVOH with an ethylene content of 44 mol%, a degree of saponification of 99.8%, an intrinsic viscosity of 0.096L / g, and an MFR of 5g / 10min (at 190°C under a load of 2160g) was used {Acetic acid content of 53ppm, sodium content of 1ppm (in terms of metal elements) , Potassium content 8ppm (metal el...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08J3/205C08J5/00C08K3/00C08K3/24C08K3/38C08L23/08C08L29/02C08L77/00
CPCC08K3/24C08K3/38C08L23/02C08L23/0861C08L29/04B29B9/06B29B9/12B29B9/14B29B7/90B29B7/726B29B7/38B29B7/007B29B7/845C08L77/00C08L77/02
Inventor 内海直彦池田薰木田师幸原哲也河村修吉
Owner KURARAY CO LTD
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