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Aqueous latex

A technology of water-based latex and monomer, applied in the direction of adhesives, adhesive types, monocarboxylate copolymer adhesives, etc., can solve the problems of reducing viscosity temperature dependence, insufficient, etc., and achieve small temperature dependence, Excellent coatability effect

Active Publication Date: 2012-07-04
RESONAC CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the temperature dependence of viscosity can be reduced to some extent by this method, it is still not sufficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Distilled water, 36 parts by mass of vinyl acetate, and 2.5 parts by mass of polyvinyl alcohol "PVA-205" (manufactured by Kuraray Co., Ltd., with a saponification degree of 88 mol%) were added to a stainless steel autoclave with an inner capacity of 1.5 liters equipped with an anchor mixer. , average degree of polymerization 500), 0.3 parts by mass of polyvinyl alcohol "PVA-217" (manufactured by Kuraray Co., Ltd., saponification degree 88 mol%, average degree of polymerization 1700), 0.2 parts by mass of ascorbic acid, 1 part by mass of 80 mass% an aqueous solution of acrylic acid, and 2 parts by mass of an aqueous solution of 50% by mass of acrylamide. Next, the air in the autoclave was fully replaced with ethylene.

[0042] Under stirring, the polymerization temperature was set at 60° C., and the ethylene pressure was increased to 5.0 MPa. Next, while adding 0.1 parts by mass of hydrogen peroxide uniformly over 8 hours, 12 parts by mass of vinyl acetate was uniformly...

Embodiment 2

[0044] Except that the addition amount of the aqueous solution of 80 mass % acrylic acid is changed into 2 mass parts, all the other operate in the same manner as in Example 1 to obtain the aqueous latex.

Embodiment 3

[0046] Except having used 1 mass part of diacetone acrylamide instead of the 50 mass % aqueous solution of acrylamide, it carried out similarly to Example 1, and obtained the aqueous latex.

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PUM

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Abstract

The invention aims to provide a kind of water borne latex of which the viscosity has little temperature dependence. The latex has good water resistance, mild water resistance, boiling water resistance and coating property. The water borne latex of the invention is characterized in that the water borne latex is produced by the copolymerization of ethylene, vinyl acetate, unsaturated monomers containing carboxyl and lactam monomers in the presence of polyvinyl alcohol having a saponification degree of 80 to 90 mole%. The used lactam monomers can be represented the follow general formula (1): CH2=CR1-CONHR2 (wherein R1 is H or CH3, R2 is H or C (CH3)2COCH3).

Description

technical field [0001] The present invention relates to an aqueous latex having a small temperature dependence of viscosity and excellent water resistance, warm water resistance, boiling water resistance, and applicability. Background technique [0002] Now, polyvinyl alcohol (hereinafter, sometimes referred to as PVA) is used as a protective colloid to copolymerize ethylene and vinyl acetate to obtain water-based latex containing ethylene-vinyl acetate copolymer resin, which is widely used in paper and woodworking. And binders, coatings, etc. for fiber processing. Among them, when water resistance and adhesiveness are required, a widely used method is to use fully saponified PVA as a protective colloid and to use a carboxyl group-containing unsaturated monomer in combination. However, the obtained water-based latex has good cohesiveness and water resistance, but it has a great disadvantage, that is, the viscosity rises sharply at low temperature, and sometimes reaches the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/02C08F218/08C08F2/22C08F220/56C08F220/06C09J123/08C09J131/04
Inventor 高月洋岛崎伸
Owner RESONAC CORPORATION