Method for preparation of ethylene vinylacetate copolymer

A vinyl acetate copolymer, vinyl acetate technology, applied in the direction of pressure vessels used in chemical processes, etc., can solve problems such as low mechanical strength and low crystallinity

Active Publication Date: 2020-03-17
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Meanwhile, although ethylene-vinyl acetate copolymer has high transparency and adhesiveness, it is generally known to have low crystallinity and thus low mechanical strength compared with polyethylene

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  • Method for preparation of ethylene vinylacetate copolymer

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[0023] According to one embodiment of the present invention, a kind of preparation method of ethylene-vinyl acetate copolymer is provided, the method comprises the following steps: in the presence of initiator, make ethylene monomer and vinyl acetate Monomer polymerization, wherein the temperature of the upper section of the autoclave reactor in the polymerization step is 130°C to 160°C, the temperature of the lower section of the autoclave reactor in the polymerization step is 170°C to 230°C, and the pressure of the autoclave reactor is 1800 bar to 2100 bar.

[0024] Ethylene-vinyl acetate (EVA) copolymers can be prepared in autoclave reactors or tubular reactors, generally, ethylene-vinyl acetate prepared in autoclave reactors has a broad molecular weight distribution, while in tubular reactors Ethylene-vinyl acetate produced in a reactor has a narrow molecular weight distribution, and thus, can be produced by selecting a reactor according to usage.

[0025] Meanwhile, in t...

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Abstract

The present invention relates to a method for preparation of an ethylene vinylacetate copolymer wherein a polymerization condition is controlled with the aid of an autoclave reactor to improve mechanical strength of the copolymer.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2017-0146281 filed with the Korean Intellectual Property Office on November 3, 2017, the entire contents of which are incorporated herein by reference. [0003] The present invention relates to the preparation method of ethylene-vinyl acetate copolymer. Specifically, the present invention relates to a method for preparing an ethylene-vinyl acetate copolymer whose mechanical strength can be improved by controlling polymerization conditions. Background technique [0004] Ethylene-vinyl acetate is a copolymer of ethylene and vinyl acetate. According to the content of vinyl acetate, its use range is very wide, from hard materials to soft materials (such as hot melt adhesives), and it is compatible with polyethylene Compared with it, it has lower crystallinity and excellent low temperature performance and impact resistance. [0005] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/02C08F218/08C08F2/44C08K5/14C08L23/08
CPCC08F210/02C08F2/02C08F18/08C08F218/08C08F2500/09C08F2/44C08K5/14C08L23/0853B01J3/04B01J2203/065B01J2219/00051B01J2219/00162C08F2/01C08F2400/02
Inventor 申大荣周垠廷郑珍镐李忠勋朴敬洙承裕泽
Owner LG CHEM LTD
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