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Semi-crystalline ethylene vinyl-acetic ester emulsion polymer for heat-seal

A vinyl acetate, emulsion polymerization technology, applied in the direction of monocarboxylic acid ester copolymer adhesive, acid copolymer adhesive, adhesive type, etc., can solve the problem of pressure-sensitive adhesive hardening, stickiness and poor adhesion

Inactive Publication Date: 2004-09-08
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is reported that when the ethylene content exceeds 40% by weight, the crystallization of ethylene is exhibited and the pressure-sensitive adhesive becomes hard, and the tackiness and adhesion are poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Hydroxyethyl Cellulose / Anionic Surfactant

[0071] Delayed addition of vinyl acetate

[0072] Material

[0073] Rhodapon UB sodium lauryl sulfate (30% aqueous solution) was supplied by Rhodia;

[0074] Natrosol 250GR (2% in water) HEC (hydroxyethyl cellulose) was supplied by Rhodia.

[0075] Material

[0076] Firstly, compressed nitrogen gas was used for purging, and the stirring speed was 100 rpm. Stirring was then increased to 800 rpm and the reactor was heated to 80°C. After the reactor pressure was increased to 1800 psig (12,512 kPa) with ethylene, 5 g of the initiator solution was added at a rate of 5.0 g / min. The vinyl acetate time delay for initiation was started at 0.54 g / min, the surfactant time delay was started at 1.03 g / min, and the initiator time delay was started again at 0.34 g / min. The ethylene pressure was maintained at 1800 psig for 300 minutes. After 300 minutes the vinyl acetate delay, surfactant delay and ethylene pressuri...

Embodiment 2

[0080] Anionic surfactant and polyvinyl alcohol stabilized VAE

[0081] Delayed addition of vinyl acetate and thermal initiation

[0082] Material

[0083] Celvol 205: 86-88% hydrolyzed polyvinyl alcohol by Celanese

[0084] Material

[0085] polymer composition

Embodiment 3

[0087] Hybrid HEC / surfactant stabilized VAE

[0088] Delayed addition of vinyl acetate

[0089] low temperature, redox initiator

[0090] Material

[0091] Triton: anionic surfactant from Union Carbide

[0092] Igepal CO-630: Nonylphenol ethoxylate surfactant supplied by Rhone-Polenc.

[0093] Material

[0094] SFS = sodium formaldehyde sulfoxylate

[0095] polymer composition

[0096] *Tm transition is broad, approximately 16-50°C, as determined by DSC.

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Abstract

This invention is directed to aqueous-based ethylene-vinyl acetate (EVA) polymer emulsions suited for use in heat seal applications. The EVA polymers of this invention are produced by a relatively low-pressure process, i.e., less than 2000 psig, preferably from about 1000 to about 2000 psig. The aqueous-based EVA based polymer emulsions contain crystalline segments resulting from ethylene linkages and are prepared by emulsion polymerizing ethylene and vinyl acetate, preferably with a carboxylic monomer, in the presence of a stabilizing system containing surfactant or a cellulosic protective colloid in combination with surfactant.

Description

Background of the invention [0001] Aqueous dispersions of vinyl acetate and ethylene copolymers are known. Generally, copolymers are considered high ethylene copolymers when the ethylene content of the copolymer exceeds 40% by weight of the polymer, usually greater than 50% by weight of the polymer. These are commonly referred to as EVA copolymers, while copolymers with less than 50% by weight ethylene are commonly referred to as VAE copolymers. One method of preparing copolymer emulsions with high ethylene content is to polymerize vinyl acetate and ethylene in the presence of a solvent, and then emulsify the polymer by mechanical means. Another method of forming vinyl acetate and ethylene copolymers is the emulsion polymerization of vinyl acetate and ethylene at high pressure in the presence of water and a stabilizing medium. [0002] EVA polymers have been recognized to have many uses, including as coatings, pressure sensitive adhesives, paper saturation binders, coatings ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/24C08F210/02C08F218/08C08J3/07C08L1/02C09D123/08C09J11/08C09J123/08C09J131/04C09J133/02
CPCC08L1/02C09D123/0853C08F218/08C08F210/02Y10T428/31855Y10T428/31895C08F2/24C08L2666/26C08F2500/20C08F220/06C08J3/07
Inventor J·J·拉拉斯科C·L·达尼尔斯D·W·霍瓦特M·S·维拉萨诺斯R·H·博特
Owner WACKER CHEM GMBH
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