Polyvinyl-Alcohol-Stabilized Redispersible Powders With Plasticized Properties

a technology of polyvinylalcohol and redispersible powder, which is applied in the direction of special tyres, vehicle components, tire parts, etc., can solve the problem of reducing the fluidity of the modification of construction compositions such as mortar or concrete with redispersible powder, and achieve the effect of improving the fluidity of construction compounds

Inactive Publication Date: 2007-07-05
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] An object of the invention is to provide redispersible powders stabilized with polyvinyl alcohol which improve the fluidity of construction compounds to which they are added. This and other objects are achieved through the preparation and use of a polyvinyl alcohol-stabilized mixture of a first redispersible polymer or copolymer, and a second copolymer prepared from at least two acid-containing monomers.

Problems solved by technology

In many cases modification of construction compositions such as mortar or concrete with redispersible powders decreases fluidity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 3

[0035] 23 parts by weight of a redispersible powder prepared by spraying an aqueous polymer dispersion based on a vinyl acetate / ethylene copolymer having a Tg of 17° C., stabilized with 8% by weight of partially hydrolyzed polyvinyl alcohol, and containing 5% by weight of partially hydrolyzed polyvinyl alcohol, and with 7.4% by weight of plasticizer A (copolymer of 22% by weight methacrylic acid, 49% by weight ethyl acrylate, 7% by weight methyl methacrylate, and 22% by weight sulfopropyl acrylate), were tested in the above formulation. The results are summarized in Table 2.

example 4

[0036] Example 3 was followed, but instead of co-spraying with 7.4% by weight of plasticizer A, 6.7% by weight of plasticizer B (copolymer of 27% by weight methacrylic acid, 49% by weight ethyl acrylate, 7% by weight methyl methacrylate, 17% by weight sulfopropyl acrylate) was used. The results are summarized in Table 2.

example 5

[0037] Example 3 was followed, but instead of co-spraying with 7.4% by weight of plasticizer A, 10% by weight of plasticizer A was used. The results are summarized in table 2.

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Abstract

Polyvinyl-alcohol-stabilized redispersible powders which have plasticizing properties are obtained by drying polyvinyl-alcohol-stabilized aqueous dispersions of polymers of one or more monomers from the group of vinyl esters of optionally branched C1-18 alkylcarboxylic acids, (meth)acrylic esters of optionally branched C1-15 alcohols, dienes, olefins, vinylaromatics and vinylhalides, in the presence of a copolymer formed from a) one or more monomers from the group of ethylenically unsaturated monocarboxylic acids, ethylenically unsaturated dicarboxylic acids and their anhydrides, each having 4 to 8 carbon atoms, and salts thereof, b) one or more ethylenically unsaturated compounds containing sulfonic, sulfuric, and / or phosphonic acid groups, and salts thereof, and c) one or more monomers from the group consisting of vinyl esters of optionally branched C1-18 alkylcarboxylic acids and (meth)acrylic esters of optionally branched C1-15 alcohols.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The invention relates to polyvinyl-alcohol-stabilized redispersible powders having plasticizing properties, to processes for preparing them, and to their use in chemical products for the construction industry. [0003] 2. Background Art [0004] Polymer powders stabilized with protective colloid which are redispersible in water (redispersible powders) are employed as additives in construction compositions, based for example on cement or gypsum, in order to improve strength and abrasion resistance, or in the case of construction adhesives, to improve adhesive tensile strength. The protective colloid used is frequently polyvinyl alcohol, since this colloid contributes to improved strength, in comparison to polymers stabilized with low molecular weight emulsifiers. [0005] Redispersible powders of this kind are obtainable by drying the corresponding protective-colloid-stabilized polymer dispersions, with the addition during...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C04B24/26C08J3/16C04B24/16C08J3/12C08L29/04C08L31/04C09D123/00C09D125/00C09D127/00C09D129/04C09D131/02C09D133/06C09J123/00C09J125/00C09J127/00C09J129/04C09J131/02C09J133/06
CPCC04B24/163C04B24/2623C04B24/2641C04B24/2676C04B24/2688C08L29/04C04B2103/30C04B2111/62C04B2111/70C08J3/122C04B2103/0057
Inventor HAERZSCHEL, REINHARDBASTELBERGER, THOMASDIETRICH, ULFHOFFMANN, ARMIN
Owner WACKER CHEM GMBH
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