Storage-stable, silane-modified core-shell copolymers
First Claim
1. A storage-stable, silane-modified core-shell copolymer comprising a shell-forming copolymer I ofa) from 70 to 95% by weight, based on the overall weight of the shell, of acrylic and/or methacrylic C1 - to C10 -alkyl esters of which from 20 to 80% by weight have a water solubility of not more than 2 g/l and from 80 to 20% by weight, based in each case on the comonomers a), have a water solubility of at least 10 g/l, andb) from 5 to 30% by weight, based on the overall weight of the shell, of one or more ethylenically unsaturated, functional and water-soluble monomers including a proportion of from 25 to 100% by weight, based on the comonomers b), of unsaturated carboxylic acids, and a core-forming copolymer II of one or more monomers c) from the group of the vinyl esters, monoolefinically unsaturated mono- or dicarboxylic esters, vinylaromatic compounds, olefins, 1,3-dienes and vinyl halides,wherein the shell contains no silane compounds and the core comprises one or more silane compounds d) from the group of the mercaptosilanes alone or in combination with one or more olefinically unsaturated, hydrolyzable silicon compounds.
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Abstract
Storage-stable, silane-modified core-shell copolymers are provided comprising a shell-forming copolymer I of
a) from 70 to 95% by weight, based on the overall weight of the shell, of acrylic and/or methacrylic C1 - to C10 -alkyl esters of which from 20 to 80% by weight have a water solubility of not more than 2 g/l and from 80 to 20% by weight, based in each case on the comonomers a), have a water solubility of at least 10 g/l, and
b) from 5 to 30% by weight, based on the overall weight of the shell, of one or more ethylenically unsaturated, functional and water-soluble monomers including a proportion of from 25 to 100% by weight, based on the comonomers b), of unsaturated carboxylic acids, and a core-forming copolymer II of one or more monomers c) from the group of the vinyl esters, monoolefinically unsaturated mono- or dicarboxylic esters, vinylaromatic compounds, olefins, 1,3-dienes and vinyl halides,
wherein the shell contains no silane compounds and the core comprises one or more silane compounds d) from the group of the mercaptosilanes alone or in combination with olefinically unsaturated, hydrolyzable silicon compounds.
39 Citations
11 Claims
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1. A storage-stable, silane-modified core-shell copolymer comprising a shell-forming copolymer I of
a) from 70 to 95% by weight, based on the overall weight of the shell, of acrylic and/or methacrylic C1 - to C10 -alkyl esters of which from 20 to 80% by weight have a water solubility of not more than 2 g/l and from 80 to 20% by weight, based in each case on the comonomers a), have a water solubility of at least 10 g/l, and b) from 5 to 30% by weight, based on the overall weight of the shell, of one or more ethylenically unsaturated, functional and water-soluble monomers including a proportion of from 25 to 100% by weight, based on the comonomers b), of unsaturated carboxylic acids, and a core-forming copolymer II of one or more monomers c) from the group of the vinyl esters, monoolefinically unsaturated mono- or dicarboxylic esters, vinylaromatic compounds, olefins, 1,3-dienes and vinyl halides, wherein the shell contains no silane compounds and the core comprises one or more silane compounds d) from the group of the mercaptosilanes alone or in combination with one or more olefinically unsaturated, hydrolyzable silicon compounds.
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7. A process for preparing storage-stable, silane-modified core-shell copolymer dispersions and powders by free-radical emulsion polymerization of a comonomer mixture I comprising
a) from 70 to 95% by weight, based on the overall weight of the comonomer mixture I, of acrylic and/or methacrylic C1 - to C10 -alkyl esters of which from 20 to 80% by weight have a water solubility of not more than 2 g/l and from 80 to 20% by weight, based in each case on the comonomers a), have a water solubility of at least 10 g/l, and b) from 5 to 30% by weight, based on the overall weight of the comonomer mixture I, of one or more ethylenically unsaturated, functional and water-soluble monomers including a proportion of from 25 to 100% by weight, based on the comonomers b), of unsaturated carboxylic acids, and the comonomer mixture I is introduced into a reactor together with water and emulsifier at a pH of from 2 to 5, polymerization is started by adding an initiator at a temperature of from 40° - C. to 90°
C. and, at a conversion of at least 40% of the comonomer mixture I, a comonomer mixture II comprising one or more monomers c) selected from the group consisting of the vinyl esters, monoolefinically unsaturated mono- or dicarboxylic esters, vinylaromatic compounds, olefins, 1,3-dienes and vinyl halides is metered in, alone or with further emulsifier and initiator, and the resulting copolymer dispersion is dried if desired, wherein the comonomer mixture I contains no silane compounds and the comonomer mixture II comprises one or more silane compounds d) from the group of the mercaptosilanes alone or in combination with one or more olefinically unsaturated, hydrolyzable silicon compounds.
- C. to 90°
Specification