EP0398755A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Composite paint film
Assignee: Kansai Paint Co Ltd
•
Filing: 1990-05-18
•
Granted: —
•
Expires: 2010-05-18
Abstract
Abstract The composite paint film comprises an electrodeposition paint film (I), coated on a sheet-steel automotive outer panel, and an intermediate coat paint film (II) coated on the first paint film. The electrodeposition paint film (I) is formed of epoxy-based cationic electrodeposition paint composition and has a minimum melt viscosity (λmin) not less than 0.2 during hardening. The epoxy-based composition includes an amine-added epoxy resin (1) of the type hardened with a blocked isocyanate, a colloidal silica-containing gelled particulate (2), and an alkyltin ester compound (3) of a liquid aliphatic carboxylic acid. The gelled particulate (2) is formed by dispersing a mixture of an acrylic copolymer, having a hydrolizable alkoxysilane group and a cationic group, and a cationic acidic colloidal silica in a water to carry out cross-linking reaction in particles of the colloidal silica. The second paint film (II) has a hardening starting time ranging from 15 to 20 minutes.
Inventors
- 👤 Hiroyuki Kishi
- 👤 Hitoshi Kimura
- 👤 Katsuya Yamamoto
- 👤 Yoshinobu Tamura
- 👤 Tsuneo Sakauchi
- 👤 Masahide Nagaoka
- 👤 Yoichi C/O Kansai Paint Company Ltd. Masubuchi
- 👤 Eisaku C/O Kansai Paint Company Ltd. Nakatani
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 05:58
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/44; C09D5/4419; C09D5/443; C09D5/4457; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/259; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31678; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
190 words
A composite paint film comprising: a first paint film (I) formed of epoxy-based cationic electrodeposition paint composition and having a minimum melt viscosity not less than 0.2 during hardening, said minimum melt viscosity being determined according to a logarithmic decrement of viscoelasticity of said first paint film and by an oscillated pendulum type viscoelasticity measuring device, said epoxy-based cationic electrodeposition paint composition including an amine-added epoxy resin (1) of the type which is hardened with a blocked isocyanate, a colloidal silica-containing gelled particulate (2) which is formed by dispersing a mixture of an acrylic copolymer having a hydrolizable alkoxysilane group and a cationic group and a cationic acidic colloidal silica in a water to carry out cross-linking reaction in particles of said colloidal silica, and an alkyltin ester compound (3) of a liquid aliphatic carboxylic acid; and a second paint film (II) coated on said first paint film, said second paint film having a hardening starting time ranging from 5 to 20 minutes, said hardening starting time being determined according to a logarithmic decrement of viscoelasticity of said second paint film and by an oscillated pendulum type viscoelasticity measuring device.
Claim 2
Dependent Claim
190 words
A composite paint film comprising: a first paint film (I) formed of epoxy-based cationic electrodeposition paint composition and having a minimum melt viscosity not less than 0.2 during hardening, said minimum melt viscosity being determined according to a logarithmic decrement of viscoelasticity of said first paint film and by an oscillated pendulum type viscoelasticity measuring device, said epoxy-based cationic electrodeposition paint composition including an amine-added epoxy resin (1) of the type which is hardened with a blocked isocyanate, a colloidal silica-containing gelled particulate (2) which is formed by dispersing a mixture of an acrylic copolymer having a hydrolizable alkoxysilane group and a cationic group and a cationic acidic colloidal silica in a water to carry out cross-linking reaction in particles of said colloidal silica, and an alkyltin ester compound (3) of a liquid aliphatic carboxylic acid; and a second paint film (II) coated on said first paint film, said second paint film having a hardening starting time ranging from 5 to 20 minutes, said hardening starting time being determined according to a logarithmic decrement of viscoelasticity of said second paint film and by an oscillated pendulum type viscoelasticity measuring device.
Claim 3
Dependent Claim
44 words
A composite paint film as claimed in Claim 1, wherein said blocked isocyanate hardening type amine-added epoxy resin is a reaction product between a polyepoxide compound and one selected from the group consisting of amines and a hydroxyl compound having a primary amino group.
Claim 4
Dependent Claim
57 words
A composite paint film as claimed in Claim 2, wherein said amines are selected from the group consisting of a mixture of primary monoamine and primary polyamine, a mixture of secondary monoamine and secondary polyamine, a mixture of primary and secondary polyamines, and a mixture of secondary monoamine and secondary polyamine which has a primary amino group.
Claim 5
Dependent Claim
33 words
A composite paint film as claimed in Claim 2 or 3, wherein said polyepoxide compound has at least two epoxy groups per molecule and a number average molecular weight of at least 200.
Claim 6
Dependent Claim
27 words
A composite paint film as claimed in Claim 2, 3 or 4, wherein said polyepoxide compound is formed by a reaction between a polyphenol compound and epichlorohydrin.
Claim 7
Dependent Claim
51 words
A composite paint film as claimed in any preceding claim, wherein said acrylic copolymer is formed by copolymerization of a mixture including a polymerizable unsaturated vinylsilane monomer, having a vinyl-type double bond and a hydrolizable alkoxysilane group, and a polymerizable unsaturated monomer, having a vinyl-type double bond and a cationic group.
Claim 8
Dependent Claim
27 words
A composite paint film as claimed in Claim 6, wherein said mixture includes a polymerizable unsaturated monomer having a vinyl type double bond and a hydroxyl group.
Claim 9
Dependent Claim
38 words
A composite paint film as claimed in Claim 6 or 7, wherein said polymerizable vinylsilane monomer is one selected from the group consisting of vinyltrimethoxy silane, vinyltriethoxy silane, vinyltris-β-methoxyethoxy silane, γ-(meth)acryloyl oxypropyl trimethoxy silane, and γ-methacryloyl oxypropylmethyldimethoxy silane.
Claim 10
Dependent Claim
38 words
A composite paint film as claimed in Claim 6, 7 or 8, wherein said polymerizable unsaturated monomer having a vinyl-type double bond and a cationic group is selected from the group consisting of dimethylaminopropyl (meth)acrylate and diethylaminoethyl (meth)acrylate.
Claim 11
Dependent Claim
35 words
A composite paint film as claimed in Claim 7, wherein said polymerizable unsaturated monomer having a vinyl-type double bond and a hydroxyl group is selected from the group consisting of 2-hydroxyethyl (meth)acrylate and hydroxypropyl (meth)acrylate.
Claim 12
Dependent Claim
40 words
A composite paint film as claimed in Claim 7, wherein said mixture includes an additional monomer selected from the group consisting of an alkyl ester of (meth)acrylic acid, a vinyl aromatic monomer, an amide derivative of (meth)acrylic acid, and (meth)acrylonitrile.
Claim 13
Dependent Claim
28 words
A composite paint film as claimed in Claim 11, wherein said alkyl ester of (meth)acrylic acid is selected from methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, and isopropyl (meth)acrylate.
Claim 14
Dependent Claim
23 words
A composite paint film as claimed in Claim 11, wherein said vinyl aromatic monomer is selected from styrene, α-methyl styrene, and vinyl toluene.
Claim 15
Dependent Claim
44 words
A composite paint film as claimed in any of claims 6 to 13, wherein said polymerizable unsaturated monomer having a vinyl-type double bond and a hydrolizable alkoxysilane is within a range from 1 to 30%, preferably 3 to 20%, by weight of said mixture.
Claim 16
Dependent Claim
44 words
A composite paint film as claimed in any of claims 6 to 15, wherein said polymerizable unsaturated monomer having a vinyl-type double bond and a cationic group is within a range from 5 to 30%, preferably 5 to 25%, by weight of said mixture.
Claim 17
Dependent Claim
41 words
A composite paint film as claimed in Claim 7, wherein said polymerizable unsaturated monomer having a vinyl type double bond and a hydroxyl group is within a range from 0 to 30%, preferably 5 to 20%, by weight of said mixture.
Claim 18
Dependent Claim
30 words
A composite paint film as claimed in Claim 11, wherein said additional monomer is within a range from 10 to 94%, preferably 35 to 82%, by weight of said mixture.
Claim 19
Dependent Claim
53 words
A composite paint film as claimed in any preceding claim, wherein said acrylic copolymer has an amine value of 10 to 100, preferably 15 to 80, a hydroxyl value of 0 to 200, preferably 30 to 130, and a number average molecular weight of 5000 to 100 000, preferably 7000 to 30 000.
Claim 20
Dependent Claim
27 words
A composite paint film as claimed in any preceding claim, wherein said cationic acidic colloidal silica has an average particle size ranging from 0.004 to 0.1 µm.
Claim 21
Dependent Claim
50 words
A composite paint film as claimed in any preceding claim, wherein said cationic acidic colloidal silica is within a range from 5 to 30 parts by weight, preferably 10 to 20 parts by weight, relative to 100 parts by weight of the resinous solid content of said electrodeposition paint composition.
Claim 22
Dependent Claim
25 words
A composite paint film as claimed in any preceding claim, wherein said alkyltin ester compound is selected from dibytyltin laurate, dibutyltin diacetate, and dioctyltin diacetate.
Claim 23
Dependent Claim
49 words
A composite paint film as claimed in any preceding claim, wherein said alkyltin ester compound is within a range from 0.1 to 10 parts by weight, preferably 0.2 to 5 parts by weight, relative to 100 parts by weight of the resinous solid content of said electrodeposition paint composition.
Claim 24
Dependent Claim
21 words
A composite paint film as claimed in any preceding claim, applied to a sheet-steel outer panel of an automotive vehicle body.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.