Aqueous dispersion type coating composition

Claim 2

A heat curable aqueous dispersion coating composition comprising (a) 90 to 30 parts by weight of an aqueous medium, (b) 10 to 70 parts by weight of water-insoluble synthetic resin particles having a softening point of 5° to 120° C. and an average particle size of 1 to 30μ and (c) separate particles of a scaly aluminum pigment in which the short diameter: long diameter ratio in the particles is 1: at least 10 and the long diameter is not larger than 100μ, in an amount of 0.05 to 30% by weight based on the resin particles said resin particles being selected from (1) a mixture in the respective particles of at least two types of synthetic resins capable of reacting with each other upon heating or (2) a mixture in the respective particles of a synthetic resin and a curing agent for said resin, capable of causing curing of said resin upon heating.

Claim 3

A coating composition as set forth in claim 1 wherein the component (c) is 0.1 to 30% by weight, based on the resin particles, of a mixture of a scaly aluminum pigment in which the short diameter: long diameter ratio in the particles is 1: at least 10 and the long diameter is not larger than 100μ, and a flaky pigment and the amount of the flaky pigment is 5 to 100% by weight based on the scaly aluminum pigment.

Claim 4

A coating composition as set forth in claim 1 wherein the component (b) is a mixture of an acrylic resin having a hydroxyl value of 20 to 120 and a number average molecular weight of 3000 to 35000 and a blocked isocyanate resin, the acrylic resin/blocked isocyanate resin weight ratio being from 100/5 to 100/100.

Claim 5

A coating composition as set forth in claim 1 wherein the component (b) is a mixture of an acrylic resin having a hydroxyl value of 0.05 to 100, and acid value of 5 to 30 and a number average molecular weight of 3000 to 35000 and an aminoplast resin, the acrylic resin/aminoplast resin weight ratio being from 100/10 to 100/100.

Claim 6

A coating composition as set forth in claim 1 wherein the component (b) is a combination of an acrylic copolymer containing 0.5 to 30% by weight of glycidyl group-containing α,β-ethylenically unsaturated monomer segments in the molecule and at least one member selected from dibasic acids, polybasic acids and acid anhydrides, the copolymer/acid weight ratio being from 100/3 to 100/30.

Claim 7

A coating composition as set forth in claim 1 wherein the component (b) is a combination of an acrylic copolymer containing 0.5 to 30% by weight of blocked isocyanate group-containing α,β-ethylenically unsaturated monomer segments in the molecule and a polyhydric alcoholic hydroxyl group-containing compound, the copolymer/polyhydric alcoholic hydroxyl group-containing compound weight ratio being from 100/5 to 100/100.

Claim 8

A coating composition as set forth in claim 1 wherein the component (b) is a combination of an epoxy resin having an epoxy equivalent of 400 to 5000 and a softening point of 40° to 120° C. and at least one member selected from amines, polybasic acids, aminoplast resins, imidazoles, acid anhydrides, blocked isocyanates, triazoles and dicyandiamine, the mixing weight ratio of the two components being from 100/0.5 to 100/30.

Claim 9

A coating composition as set forth in claim 1 wherein the component (b) is a combination of a polyester resin having a hydroxyl value of 30 to 100 and a softening point of 20° to 120° C. and at least one member selected from acid anhydrides and blocked isocyanates, the mixing weight ratio of the two components being from 100/5 to 100/80.

Claim 10

A coating composition as set forth in claim 1 wherein the component (b) comprises resin particles containing 30 to 100% by weight of an acrylic copolymer containing 0.5 to 30% by weight of glycidyl group-containing α,β-ethylenically unsaturated monomer segments in the molecule and resin particles containing 30 to 100% by weight of a carboxyl group-containing acrylic copolymer containing 0.5 to 30% by weight of segments of at least one monomer selected from acrylic acid, methacrylic acid, itaconic acid, crotonic acid and maleic anhydride, the glycidyl group-containing acrylic copolymer/carboxyl group-containing acrylic copolymer weight ratio being from 99/1 to 1/99.

Claim 11

A coating composition as set forth in claim 4 wherein the aminoplast resin is at least one member selected from methylolated products of urea, benzoguanamine and melamines, methyl-esterified and butyletherified products of said methylolated products, and condensates thereof, and the acrylic resin/aminoplast resin weight ratio is from 90/10 to 50/50.

Claim 12

A heat curable aqueous dispersion coating composition comprising (a) 90 to 30 parts by weight of an aqueous medium, (b) 10 to 70 parts of water-insoluble synthetic resin particles having a softening point of 5° to 120° C. and an average particle size of 1 to 30μ, (c) separate particles of a scaly aluminum pigment in which the short diameter: long diameter ratio in the particles is 1: at least 10 and the long diameter is not larger than 100μ, in an amount of 0.05 to 30% by weight based on the resin particles and (d) a water-dilutable resin in an amount of up to 30% by weight based on the resin particles, said resin particles being selected from (1) a mixture in the respective particles of at least two types of synthetic resins capable of reacting with each other upon heating or (2) a mixture in the respective particles of a synthetic resin and a curing agent for said resin capable of causing curing of said resin upon heating.

Claim 13

A heat curable aqueous dispersion coating composition comprising (a) 90 to 30 parts by weight of an aqueous medium, (b) 10 to 70 parts of water-insoluble synthetic resin particles having a softening point of 5° to 120° C. and an average particle size of 1 to 30μ, (c) separate particles of a scaly aluminum pigment in which the short diameter: long diameter ratio in the particles is 1: at least 10 and the long diameter is not larger than 100μ, in an amount of 0.05 to 30% by weight based on the resin particles and (d) a water-dilutable resin in an amount of up to 30% by weight based on the resin particles, said resin particles being selected from (1) a mixture in the respective particles of at least two types of synthetic resins capable of reacting with each other upon heating or (2) a mixture in the respective particles of a synthetic resin and a curing agent for said resin capable of causing curing of said resin upon heating.

Claim 14

A coating composition as set forth in claim 11 wherein the component (c) is 0.1 to 30% by weight, based on the resin particles, of a mixture of a scaly aluminum pigment and a flaky pigment and the amount of the flaky pigment is 5 to 100% by weight based on the scaly aluminum pigment.

Claim 15

A coating composition as set forth in claim 11 wherein the component (d) is an acrylic resin having an acid value of 30 to 80 and/or an alkyd resin with a water-soluble aminoplast resin, the mixing weight ratio as the solids of the acrylic and/or alkyd resin/aminoplast resin components being from 100/10 to 100/70.

Claim 16

A coating composition as set forth in claim 11 wherein the component (b) is a mixture of an acrylic resin having a hydroxyl value of 20 to 120 and a number average molecular weight of 3000 to 35000 and a blocked isocyanate resin, the acrylic resin/blocked isocyanate resin weight ratio being from 100/5 to 100/100.

Claim 17

A coating composition as set forth in claim 11 wherein the component (b) is a mixture of an acrylic resin having a hydroxyl value of 0.05 to 100, an acid value of 5 to 30 and a number average molecular weight of 3000 to 35000 and an aminoplast resin, the acrylic resin/aminoplast resin weight ratio being from 100/10 to 100/100.

Claim 18

A coating composition as set forth in claim 11 wherein in the component (b) is a combination of an acrylic copolymer containing 0.5 to 30% by weight of glycidyl group-containing α,β-ethylenically unsaturated monomer segments in the molecule and at least one member selected from dibasic acids, polybasic acids and acid anhydrides, the acrylic copolymer/acid weight ratio being from 100/3 to 100/30.

Claim 19

A coating composition as set forth in claim 11 wherein the component (b) is a combination of an acrylic copolymer containing 0.5 to 30% by weight of blocked isocyanate group-containing α,β-ethylenically unsaturated monomer segments in the molecule and a polyhydric alcoholic hydroxyl group-containing compound, the acrylic copolymer/polyhydric alcoholic hydroxyl group-containing compound weight ratio being from 100/5 to 100/100.

Claim 20

A coating composition as set forth in claim 12 wherein the component (b) is a combination of an epoxy resin having an epoxy equivalent of 400 to 5000 and a softening point of 40° to 120° C. and at least one member selected from amines, polybasic acids, aminoplast resins, imidazoles, acid anhydrides, blocked isocyanates, triazoles and dicyandiamine, the mixing weight ratio of the two components being from 100/0.5 to 100/30.

Claim 21

A coating composition as set forth in claim 12 wherein the component (b) is a combination of a polyester resin having a hydroxyl value of 30 to 100 and a softening point of 20° to 120° C. and at least one member selected from acid anhydrides and blocked isocyanates, the mixing weight ratio of the two components being from 100/5 to 100/80.

Claim 22

A coating composition as set forth in claim 11 wherein the component (b) contains 30 to 100% by weight of an acrylic resin having a hydroxyl value of 0.5 to 100, an acid value of 5 to 30 and a number average molecular weight of 3000 to 35000 and the component (d) is a water-soluble aminoplast resin, the acrylic resin/water-soluble aminoplast resin weight ratio being from 100/0.5 to 100/100.

Claim 23

A coating composition as set forth in claim 11 wherein the component (b) comprises resin particles containing 30 to 100% by weight of an acrylic copolymer containing 0.5 to 30% by weight of glycidyl group-containing α,β-ethylenically unsaturated monomer segments in the molecule and resin particles containing 30 to 100% by weight of a carboxyl group-containing acrylic copolymer containing 0.5 to 30% by weight of segments of at least one monomer selected from acrylic acid, methacrylic acid, itaconic acid, crotonic acid and maleic anhydride in the molecule, the glycidyl group-containing acrylic copolymer/carboxyl group-containing acrylic copolymer weight ratio being from 99/1 to 1/99.

Claim 24

A coating composition as set forth in claim 11 wherein the isocyanate equivalent of the blocked isocyanate resin is 100 to 2000 and the mixing ratio of the blocked isocyanate resin and the acrylic resin is such that the ratio of the number of isocyanate groups to the number of hydroxyl group is from 0.4 to 1.2.

Claim 25

A coating composition as set forth in claim 19 wherein the blocked isocyanate is a blocked isocyanate resin having an isocyanate equivalent of 100 to 2000 and the mixing ratio of the blocked polyisocyanate resin and the polyester resin is such that the ratio of the number of isocyanate groups to the number of hydroxyl group is from 0.4 to 1.2.