EP0611095A1
Expired / Lapsed
EP
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Water-based coating composition
Assignee: Nippon Paint Co Ltd
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Filing: 1994-02-02
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Granted: —
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Expires: 2014-02-02
Abstract
Abstract A water-based coating composition is disclosed, comprising (1) a self-emulsified polyurethane resin emulsion, (2) a resin which is either (i) a polymer of an oxazoline represented by formula (I): wherein R¹, R², R³, and R⁴ each represents a hydrogen atom, a halogen atom, an alkyl group, a phenyl group, or a substituted phenyl group; and R⁵ represents a non-cyclic organic group having an addition-polymerizable unsaturated bond or (ii) a copolymer of the oxazoline and a monomer which is not reactive to an oxazoline group, and (3) a self-emulsifiable epoxy resin.
Inventors
- 👤 Masaaki Takimoto
- 👤 Minao Izumi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 02:15
CPC Classifications
C; C09; C09D; C09D175/00; C09D175/04
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
88 words
A water-based coating composition comprising (1) a self-emulsified polyurethane resin emulsion, (2) a resin which is either (i) a polymer of an oxazoline represented by formula (I): wherein R¹, R², R³, and R⁴ each represents a hydrogen atom, a halogen atom, an alkyl group, a phenyl group, or a substituted phenyl group; and R⁵ represents a non-cyclic organic group having an addition-polymerizable unsaturated bond or (ii) a copolymer of the oxazoline and a monomer which is not reactive to an oxazoline group, and (3) a self-emulsifiable epoxy resin.
Claim 2
Dependent Claim
84 words
The water-based coating composition as claimed in claim 1, which further contains (4) a melamine cyanurate (a) and/or an ingredient (b) which is (b-1) a water-dispersible silica or water-dispersible aluminum silicate or (b-2) a colloidal particle dispersion comprising mainly (i) a fumed silica or fumed aluminum silicate, (ii) a colloidizing agent (aid) which is at least one compound selected from the group consisting of a phosphoric acid compound, a molybdic acid compound, a boric acid compound, and a silicic acid compound, and (iii) water.
Claim 3
Dependent Claim
51 words
The water-based coating composition as claimed in claim 1, wherein the polyurethane resin (1) is one obtained by reacting (a) a polyol which is at least one compound selected from the group consisting of a diol, a polyester polyol and a polyether polyol with (b) an aromatic, aliphatic, or alicyclic diisocyanate.
Claim 4
Dependent Claim
29 words
The water-based coating composition as claimed in claim 3, wherein the polyol (a) is a polycarbonate diol and the polyurethane resin emulsion (1) is an anionic self-emulsified polyurethane emulsion.
Claim 5
Dependent Claim
18 words
The water-based coating composition as claimed in claim 1, wherein R⁵ in formula (I) is a propenyl group.
Claim 6
Dependent Claim
32 words
The water-based coating composition as claimed in claim 1, wherein the oxazoline polymer resin or oxazoline (2) is at least one compound selected from the group consisting of 2-isopropenyl-2-oxazoline, 2-isopropenyl-4-methyl-2-oxazoline, and 2-isopropenyl-5-methyl-2-oxazoline.
Claim 7
Dependent Claim
18 words
The water-based coating composition as claimed in claim 6, wherein the oxazoline polymer resin or oxazoline is 2-isopropenyl-2-oxazoline.
Claim 8
Dependent Claim
59 words
The water-based coating composition as claimed in claim 1, wherein the monomer which is not reactive to an oxazoline group is at least one compound selected from the group consisting of a (meth)acrylic acid ester, an unsaturated nitrile, an unsaturated amide, a vinyl ester, a vinyl ether, an α-olefin, an α,β-unsaturated halogen compound monomer, and an α,β-unsaturated aromatic monomer.
Claim 9
Dependent Claim
35 words
The water-based coating composition as claimed in claim 1, wherein the amount of the oxazoline is 5 parts by weight or more per 100 parts by weight of the resin (2) on a solid basis.
Claim 10
Dependent Claim
42 words
The water-based coating composition as claimed in claim 1, wherein the amount of the self-emulsifiable epoxy resin (3) is from 5 to 50 parts by weight per 100 parts by weight of the self-emulsified polyurethane resin emulsion (1) on a solid basis.
Claim 11
Dependent Claim
43 words
The water-based coating composition as claimed in claim 1, wherein the amount of the self-emulsifiable epoxy resin emulsion (3) is from 5 to 40 parts by weight per 100 parts by weight of the self-emulsified polyurethane resin emulsion (1) on a solid basis.
Claim 12
Dependent Claim
49 words
The water-based coating composition as claimed in claim 1, wherein the amount of the resin (2) is from 1 to 50 parts by weight per 100 parts by weight of the sum of the self-emulsified polyurethane resin emulsion (1) and the self-emulsified epoxy resin (3) on a solid basis.
Claim 13
Dependent Claim
49 words
The water-based coating composition as claimed in claim 1, wherein the amount of the resin (2) is from 5 to 20 parts by weight per 100 parts by weight of the sum of the self-emulsified polyurethane resin emulsion (1) and the self-emulsifiable epoxy resin (3) on a solid basis.
Claim 14
Dependent Claim
39 words
The water-based coating composition as claimed in claim 2, wherein the amount of the melamine cyanurate (a) is from 0.05 to 25 parts by weight per 100 parts by weight of the resin solid components on a solid basis.
Claim 15
Dependent Claim
70 words
The water-based coating composition as claimed in claim 2, wherein the amount of the silica or aluminum silicate (b-1) is from 20 to 60 parts by weight and from 40 to 100 parts by weight per 100 parts by weight of the resin solid components on a solid basis when the component (b-1) has a particle diameter of from 100 to 150 nm and from 150 to 250 nm, respectively.
Claim 16
Dependent Claim
45 words
The water-based coating composition as claimed in claim 2, wherein the amount of the colloidal particle dispersion (b-2) is from 15 to 60 parts by weight per 100 parts by weight of the resin solid components of the water-based coating composition on a solid basis.
Claim 17
Dependent Claim
45 words
The water-based coating composition as claimed in claim 2, wherein the amount of the colloidal particle dispersion (b-2) is from 20 to 40 parts by weight per 100 parts by weight of the resin solid components of the water-based coating composition on a solid basis.
Claim 18
Dependent Claim
103 words
The water-based coating composition as claimed in claim 2, wherein the solid/solvent ratio is (15-50)/(85-50) by weight and the proportions of the solid components are such that the ratio of the self-emulsifiable epoxy resin (3) to the self-emulsified polyurethane resin emulsion (1) is (5-40)/100 by weight, the ratio of the resin (2) to the sum of the polyurethane resin (1) and the epoxy resin (3) is (5-20)/100 by weight, the ratio of the melamine cyanurate (a) to the resin solid components is (0.05-25)/100 by weight, and the ratio of the colloidal particles dispersion (b-2) to the resin solid components is (20-40)/100 by weight.
Claim 19
Dependent Claim
30 words
The water-based coating composition as claimed in claim 18, wherein the self-emulsified polyurethane resin emulsion (1) is a polycarbonate diol and the oxazoline polymer resin or oxazoline (2) is 2-isopropenyl-2-oxazoline.
Claim 20
Dependent Claim
35 words
The water-based coating composition as claimed in claim 1, wherein the coating composition is coated on a substrate pretreated with a metal in a thickness of from 0.5 to 20 µm on a dry basis.
Claim 21
Dependent Claim
25 words
The water-based coating composition as claimed in claim 20, wherein the film coated with the water-based coating composition is further subjected to an electro-deposition coating.
Claim 22
Dependent Claim
21 words
The water-based coating composition as claimed in claim 21, wherein the electrodeposited film is subjected to an intermediate-coating and/or a topcoating.
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