Aqueous dispersion of vinyl copolymer resin

Claim 2

An aqueous dispersion of a vinyl copolymer resin prepared by dispersing a vinyl copolymer resin solution in water, said vinyl copolymer resin solution being obtained by polymerizing 1 to 15 parts by weight of a polyoxyethylene-containing hydrophilic polymerizable vinyl monomer of which polyoxyethylene moiety has an average molecular weight of 2,000 to 10,000, 99 to 85 parts by weight of at least one polymerizable vinyl monomer selected from the group consisting of (meth)acrylates, unsaturated nitriles, vinyl halides, styrene or styrene derivatives, alpha-olefins, maleic esters, itaconic esters, dimethylaminoethylmethacrylate and diethylaminoethyl methacrylate, and 0 to 5 parts by weight of alpha, beta-unsaturated carboxylic acids, salts thereof or anhydrides thereof, in an organic solvent.

Claim 3

The aqueous dispersion of claim 1 wherein the polyoxyethylene-containing hydrophilic polymerizable vinyl monomer is represented by the following general formula ##STR11## wherein each of R 1 and R 2 represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a phenyl group, R 3 represents an alkylene group having 2 or 3 carbon atoms, R 4 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and n represents the number of repeating oxyethylene units.

Claim 4

The aqueous dispersion of claim 1 wherein the polyoxyethylene-containing hydrophilic polymerizable vinyl monomer contains not more than 30% by weight, based on the polyoxyethylene, of polyoxypropylene.

Claim 5

The aqueous dispersion of claim 1 wherein the vinyl copolymer resin solution is obtained by polymerizing 2 to 10 parts by weight of the polyoxyethylene-containing hydrophilic polymerizable vinyl monomer and 98 to 90 parts by weight of the at least one polymerizable vinyl monomer.

Claim 6

The aqueous dispersion of claim 1 wherein the vinyl copolymer resin solution is obtained by polymerizing the polyoxyethylene-containing hydrophilic polymerizable vinyl monomer and the at least one polymerizable vinyl monomer in an amount of 100 parts by weight in total in 10 to 100 parts by weight of the organic solvent.

Claim 7

The aqueous dispersion of claim 1 which contains 30 to 60% by weight of the vinyl copolymer resin.

Claim 8

A process for producing an aqueous dispersion of a vinyl copolymer resin, which comprises polymerizing 1 to 15 parts by weight of a polyoxyethylene-containing hydrophilic polymerizable vinyl monomer of which polyoxyethylene moiety has an average molecular weight of 2,000 to 10,000, 99 to 85 parts by weight of at least one polymerizable vinyl monomer selected from the group consisting of (meth)acrylates, unsaturated nitriles, vinyl halides, styrene or styrene derivatives, alpha-olefins, maleic esters, itaconic esters, dimethylaminoethyl methacrylate and diethylaminoethyl methacrylate, and 0 to 5 parts by weight of alpha, beta-unsaturated carboxylic acids, salts thereof or anhydrides thereof, in an organic solvent, adding water to the resulting vinyl copolymer resin solution and mixing them.

Claim 9

A process for producing an aqueous dispersion of a vinyl copolymer resin, which comprises polymerizing 1 to 15 parts by weight of a polyoxyethylene-containing hydrophilic polymerizable vinyl monomer of which polyoxyethylene moiety has an average molecular weight of 2,000 to 10,000, 99 to 85 parts by weight of at least one polymerizable vinyl monomer selected from the group consisting of (meth)acrylates, unsaturated nitriles, vinyl halides, styrene or styrene derivatives, alpha-olefins, maleic esters, itaconic esters, dimethylaminoethyl methacrylate and diethylaminoethyl methacrylate, and 0 to 5 parts by weight of alpha, beta-unsaturated carboxylic acids, salts thereof or anhydrides thereof, in an organic solvent, adding water to the resulting vinyl copolymer resin solution and mixing them.

Claim 10

The process of claim 7 wherein the polyoxyethylene-containing hydrophilic polymerizable vinyl monomer is represented by the following general formula ##STR12## wherein each of R 1 and R 2 represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a phenyl group, R 3 represents an alkylene group having 2 or 4 carbon atoms, R 4 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and n represents the number of repeating oxyethylene units.

Claim 11

The process of claim 7 wherein the polyoxyethylene-containing hydrophilic polymeric vinyl monomer contains not more than 30% by weight, based on the polyoxyethylene, of polyoxypropylene.

Claim 12

A paint comprising the aqueous dispersion of claim 1 as a main component.

Claim 13

The aqueous dispersion of claim 1 wherein the polyoxyethylene-containing hydrophilic polymerizable vinyl monomer is selected from the group consisting of compounds obtained by the addition of ethylene oxide or ethylene oxide containing not more than 30% by weight of propylene oxide to hydroxyethyl acrylate, beta-hydroxypropyl acrylate or beta-hydroxyethyl methacrylate; and compounds obtained by reacting polyoxyethylene glycol having an average molecular weight of 2,000 to 10,000 having H or a C 1-4 alkyl group as one terminal group and a hydroxyl as the other terminal group, or a random copolymer or graft copolymer of the aforesaid glycol and not more than 30% by weight of propylene oxide, with acrylic acid, methacrylic acid, cinnamic acid, methyl acrylate, ethyl acrylate, methyl methacrylate, propyl acrylate, butyl acrylate, methyl cinnamate or ethyl cinnamate.

Claim 14

The aqueous dispersion of claim 1 wherein the polyoxyethylene moiety has an average molecular weight of from 3,000 to 8,000.

Claim 15

The aqueous dispersion of claim 1 wherein the at least one polymerizable vinyl monomer comprises an alpha, beta-unsaturated carboxylic acid or salt thereof.

Claim 16

The aqueous dispersion of claim 1 wherein the organic solvent is selected from the group consisting of aromatic hydrocarbons, aliphatic hydrocarbons, alicyclic hydrocarbons, esters, ethers, ketones, alcohols, and Cellosolve solvents.

Claim 17

The aqueous dispersion of claim 1 wherein the organic solvent is selected from the group consisting of ethers having 1 to 4 carbon atoms, ketones having 1 to 8 carbon atoms, alcohols having 1 to 4 carbon atoms, and Cellosolve solvents.

Claim 18

The aqueous dispersion of claim 1 wherein the organic solvent is selected from the group consisting of ethylene glycol monoethyl ether, ethylene glycol monobutyl ether and diethylene glycol monoethyl ether.

Claim 19

A self-dispersing, film-forming aqueous dispersion comprising a vinyl copolymer resin-organic solvent solution dispersed in water, said vinyl copolymer resin comprising a copolymer of 2 to 10 parts by weight of a polyoxyethylene-containing hydrophilic polymerizable vinyl monomer, the polyoxyethylene moiety of which has an average molecular weight of 2,000 to 10,000, 98 to 90 parts by weight of at least one polymerizable vinyl monomer selected from the group consisting of (meth)acrylates, unsaturated nitriles, vinyl halides, styrene or styrene derivatives, alpha-olefins, maleic esters, itaconic esters, dimethylaminoethyl methacrylate and diethylaminoethyl methacrylate, and 0 to 5 parts by weight of alpha, beta-unsaturated carboxylic acids, salts thereof or anhydrides thereof, said dispersion containing from 30 to 60% by weight of the vinyl copolymer resin in the form of dispersed particles having a particle diameter of not more than about 0.5 micrometers.

Claim 20

A self-dispersing, film-forming aqueous dispersion comprising a vinyl copolymer resin-organic solvent solution dispersed in water, said vinyl copolymer resin comprising a copolymer of 2 to 10 parts by weight of a polyoxyethylene-containing hydrophilic polymerizable vinyl monomer, the polyoxyethylene moiety of which has an average molecular weight of 2,000 to 10,000, 98 to 90 parts by weight of at least one polymerizable vinyl monomer selected from the group consisting of (meth)acrylates, unsaturated nitriles, vinyl halides, styrene or styrene derivatives, alpha-olefins, maleic esters, itaconic esters, dimethylaminoethyl methacrylate and diethylaminoethyl methacrylate, and 0 to 5 parts by weight of alpha, beta-unsaturated carboxylic acids, salts thereof or anhydrides thereof, said dispersion containing from 30 to 60% by weight of the vinyl copolymer resin in the form of dispersed particles having a particle diameter of not more than about 0.5 micrometers.

Claim 21

A coating composition comprising the aqueous dispersion of claim 17 and pigment.