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High-solids ethylene-vinyl acetate latex

A technology of vinyl acetate and ethylene, which is applied in the field of high solid content ethylene-vinyl acetate dispersion, and can solve problems such as incompatibility

Inactive Publication Date: 2007-02-28
AKZO NOBEL CHEM INT BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application cites that common batch processes are no longer suitable for the preparation of high solids vinyl acetate / ethylene dispersions without surfactants

Method used

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  • High-solids ethylene-vinyl acetate latex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] An aqueous solution was prepared by adding 378 g of AIRVOL 203 (Air Products) to 1260 g of cold deionized water while stirring. The mixture was heated at 85°C for 1 hour. Once cooled, 1 g of sodium bicarbonate, 2 g of formaldehyde sulfoxylate (sodium formaldehyde sulfoxylate), 21 g of a 1% aqueous solution of ferrous sulfate, 21 g of a 1% aqueous solution of Versene (ETDA complexing agent) and 341 g of 25-1808 (National Starch and Chemical Company), an ethylene-vinyl acetate seed latex (55% solids, 12 / 88 ethylene / vinyl acetate stabilized with 5 parts polyvinyl alcohol). The solution was stirred and the pH was adjusted to 3.9-4.1 with phosphoric acid. It was then added to a 12L stainless steel reaction vessel and the inlet was rinsed with 200g of deionized water.

[0030] The reaction vessel was purged by pressurizing to 7 bar twice with nitrogen and once with ethylene to 7 bar. Empty the vessel between purges.

[0031] The reaction vessel was then evacuated and 5764...

Embodiment 2

[0041] This example was prepared using the same method as described in Example 1, but with the water partition changed. The initial reactor charge had 1860 g of deionized water, while each initiator solution contained 353 g of deionized water. The resulting polymer had a solids content of 68.25%, a viscosity of 2550 mPa.s, and a glass transition temperature of 16.3°C.

Embodiment 3

[0043] Example 3 was synthesized as described in Example 1, but without introducing the seed latex into the aqueous phase. The resulting polymer had a solids content of 68.84%, a viscosity of 3450 mPa.s, and a Tg of 11.2°C.

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Abstract

The present invention is directed to an ethylene-vinyl acetate dispersion and a process for making the dispersion by polymerizing a monomer mixture having vinyl acetate and ethylene in a batch process, in the presence of a stabilizing system of polyvinyl alcohol and without added surfactants, to form an ethylene-vinyl acetate polymer dispersion. The copolymer dispersion has a solids level of greater than 65 percent by weight, and a viscosity of less than 5000 mPa.s when measured at 65 percent solids at 25 DEG C. The dispersion can be dried to form a redispersible powder. Both the dispersion and powder are useful in adhesive and coating formulations.

Description

field of invention [0001] The present invention relates to high solids ethylene-vinyl acetate dispersions and their production by batch polymerization of monomer mixtures containing vinyl acetate and ethylene in the presence of a polyvinyl alcohol stabilizing system without other surfactants body method. The dispersion has a solids content higher than 65% by weight, and a viscosity (when measured at 65% solids at 25° C.) of lower than 5000 mPa.s. The dispersion can be dried to a redispersible powder. Both the dispersion and the powder can be used in adhesives, coatings and cement formulations. Background of the invention [0002] Ethylene-vinyl acetate dispersions, and the powders produced by drying these dispersions, are widely used in adhesives, coatings, and cement formulations. High solids dispersions are of particular interest due to the favorable economics achieved through increased reactor efficiency. Spray drying high solids dispersions has many benefits: less wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/02C08F218/08C04B24/26C04B26/04C04B28/02C08F2/20C08L31/04C09J131/04
CPCC08F218/08C08J3/03
Inventor J·C·H·克尔A·J·麦克伦南R·N·米切尔C·S·帕藤登
Owner AKZO NOBEL CHEM INT BV
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