Core/shell copolymer dispersion whose shell comprises hydrolyzab

Details Core/shell copolymer dispersion whose shell comprises hydrolyzab Core/shell copolymer dispersion whose shell comprises hydrolyzab

1995-10-02

1998-01-13

Dean, Ralph H.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525902, 523201, C08F29100

Patent

active

057080933

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1) Field of the Invention
The invention relates to core/shell copolymer dispersions whose shell comprises hydrolyzable organosilicon comonomers, to processes for their preparation, and to their use as binders for paints, plasters and tile adhesives having good water resistance.
2) Background Art
In order to improve wet adhesion in their application as coating compositions, comonomers comprising silanol groups are incorporated by copolymerization into the copolymers of polymer dispersions. In accordance with the prevailing teaching, binders of high quality in terms of their water resistance are obtained by polymerizing a hydrolyzable organosilicon compound together with the major proportion of the monomers employed. The prior art describes a range of methods for achieving this.
U.S. Pat. No. 3,814,716 describes polymer dispersions based on vinyl acetate, acrylic ester, maleic and/or fumaric ester with 0.5-5% of a copolymerizable silane. The silane is dissolved in the entirety of the monomers employed, and the monomers--including the silane--are divided into an initial charge and a portion which is metered in slowly in the course of polymerization.
DE-C-21 48 457 (GB-A-1 407 827) discloses the use of dispersions containing silanol groups as binders of architectural coating compositions. Polymers of vinyl esters, acrylic esters or butadiene/styrene copolymers are used, into which silanol groups are incorporated by copolymerization, and which exhibit outstanding adhesion to mineral substrates. The preparation of such silanol group-containing vinyl eater polymers is the subject of DE-C-21 48 458 (GB-A-1 407 827), where it is taught to prepare the polymers by the emulsion polymerization method with the organosilicon monomers being metered in in the course of polymerization, since otherwise, if the silane is included in the initial charge, the dispersion would contain coagulates and lose its adhesion properties.
DE-A-38 03 450 (AU-A 89/29590) relates to low-emission polymer dispersions based on ethylenically unsaturated comonomers and from 0.05 to 2% by weight of ethylenically unsaturated, hydrolyzable organosilicon compounds. They are prepared by the emulsion polymerization method, with the addition of the silicon monomer being a matter of open choice--it can take place together with the comonomer phase or separately, during the entire duration of polymerization or with the first half and/or the second half of the comonomer phase.
DE-A-38 34 638 (U.S. Pat. No. 4,886,852) describes a highly complex multistage process for the preparation of an aqueous dispersion. In a first stage, a nonaqueous dispersion is prepared comprising 1 to 90% by weight of a vinyl monomer which contains alkoxysilane groups, 1 to 25% by weight of an .alpha.,.beta.-ethylenically unsaturated carboxylic acid, and 9 to 98% by weight of a further unsaturated monomer which can be polymerized by a free-radical mechanism. In a second stage, at least one further free-radically polymerizable monomer, in an organic solvent in which the polymer particles formed are insoluble, is reacted in the presence of the dispersion stabilizing resin prepared in stage 1 to give a likewise nonaqueous dispersion. In a third stage, the neutralized nonaqueous dispersion is converted by addition of water into an aqueous dispersion. The dispersions prepared in accordance with this teaching are suitable, on the basis of their good water resistance, as coating compositions.
EP-A-35 332 describes the use of unsaturated organosilicon compounds for the preparation of dispersions which are suitable as binders in dispersion tile adhesives. In addition to the organosilicon compound, the copolymers also contain aromatic vinyl monomers and (meth) acrylate monomers. They are prepared by including a portion of the monomer phase with acrylic acid in the initial charge, and metering in the remaining portion with the entirety of organosilicon monomer.
EP-A-327 376 relates to a process for the preparation of silyl-containing copolymers of vinyl esters, if d

REFERENCES:
patent: 3814716 (1974-06-01), Kowalski et al.
patent: 4886852 (1989-12-01), Numa
patent: 5120889 (1992-06-01), Yamamoto et al.
patent: 5461125 (1995-10-01), Lu et al.
"Vinyl and Diene Monomers, Part 1", E.C. Leonard Ed., Wily-Interscience, New York (1970) p. 149ff.

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