Patent US4756975A successfully refreshed from Google Patents.
US4756975A
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US
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Process for coating automotive outer bodies
Assignee: Kansai Paint Co Ltd
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Filing: 1985-11-08
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Granted: 1988-07-12
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Expires: 2005-11-08
Abstract
Abstract A process for coating automotive bodies which are composed of metallic members and plastic members, said process comprising assembling metallic members and plastic members into automotive outer bodies, applying a cation type electrocoating to the metallic members either before or after the assembling, applying onto the surfaces of the two types of members including the electrocoated surfaces of the assembled body a barrier coat comprising a modified polyolefin resin and capable of forming a barrier coat film having a static glass transition temperature of 0° to -60° C., optionally applying on said barrier coat an intermediate coating paint and then applying thereon a top coating paint.
Inventors
- 👤 Yasuhiro Fujii
- 👤 Osamu Iwase
- 👤 Hiroshi Oosumimoto
- 👤 Shinji Sugiura
- 👤 Ichiro Tabushi
- 👤 Masafumi Kume
- 👤 Takashi Udagawa
- 👤 Komaharu Matsui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:15
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/50; B05D7/52; B05D7/54; B05D7/56; B05D7/58; C; C09; C09D; C09D151/00; C09D151/06; B05D1/00; B05D1/007; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
256 words
A process of coating automotive bodies which are composed of metallic members and plastic members, said process comprising assembling metallic members and plastic members into automotive outer bodies, applying a cationic electrodeposition paint to the metallic members either before or after the assembling, applying onto the surfaces of the two types of members, including the electrodeposited surfaces of the assembled body, a barrier coat comprising a modified polyolefin resin and capable of forming a barrier coat film having a static glass transition temperature of 0° to -160° C. and then applying thereon a top coating paint, said modified polyolefin resin being selected from the group consisting of: (i) resins obtained by graft-polymerizing maleic acid or maleic anhydride onto base polyolefin resins, (ii) resins obtained by graft-polymerizing acrylic acid or methacrylic acid onto chlorinated products of base polyolefin resins (iii) copolymers between (a) at least one member selected from ethylenic hydrocarbons and (b) at least one comonomer selected from vinyl acetate, acrylic acid and methacrylic acid, (iv) compositions obtained by adding 1 to 90 parts by weight of chlorinated polyolefins to 100 parts by weight of base polyolefins, (v) compositions obtained by adding 1 to 90 parts by weight of acrylic resins having a static glass transition temperature of 0° C. or lower and a number average molecular weight of 5,000 to 100,000 to 100 parts by weight of base polyolefin resins, and (vi) compositions obtained by adding 1 to 90 parts by weight of a styrene-butadiene copolymer to 100 parts by weight of base polyolefin resins.
Claim 2
Dependent Claim
256 words
A process of coating automotive bodies which are composed of metallic members and plastic members, said process comprising assembling metallic members and plastic members into automotive outer bodies, applying a cationic electrodeposition paint to the metallic members either before or after the assembling, applying onto the surfaces of the two types of members, including the electrodeposited surfaces of the assembled body, a barrier coat comprising a modified polyolefin resin and capable of forming a barrier coat film having a static glass transition temperature of 0° to -160° C. and then applying thereon a top coating paint, said modified polyolefin resin being selected from the group consisting of: (i) resins obtained by graft-polymerizing maleic acid or maleic anhydride onto base polyolefin resins, (ii) resins obtained by graft-polymerizing acrylic acid or methacrylic acid onto chlorinated products of base polyolefin resins (iii) copolymers between (a) at least one member selected from ethylenic hydrocarbons and (b) at least one comonomer selected from vinyl acetate, acrylic acid and methacrylic acid, (iv) compositions obtained by adding 1 to 90 parts by weight of chlorinated polyolefins to 100 parts by weight of base polyolefins, (v) compositions obtained by adding 1 to 90 parts by weight of acrylic resins having a static glass transition temperature of 0° C. or lower and a number average molecular weight of 5,000 to 100,000 to 100 parts by weight of base polyolefin resins, and (vi) compositions obtained by adding 1 to 90 parts by weight of a styrene-butadiene copolymer to 100 parts by weight of base polyolefin resins.
Claim 3
Dependent Claim
39 words
A process according to claim 1, wherein the cationic electrodeposition paint is a thermosetting cathodic deposition paint obtained by neutralizing a base resin having basic amino groups with an acid and dissolving or dispersing the resulting resin in water.
Claim 4
Dependent Claim
29 words
A process according to claim 1, wherein the cationic electrodeposition paint contains 35 parts by weight or less of pigments based on 100 parts by weight of resin solid.
Claim 5
Dependent Claim
29 words
A process according to claim 1, wherein the cationic electrodeposition paint contains 40 to 150 parts by weight, of pigments based on 100 parts by weight of resin solid.
Claim 6
Dependent Claim
30 words
A process according to claim 1, wherein the plastic members are subjected to a preliminary surface treatment selected from degreasing with solvent vapor, grinding, acid treatment and corona discharge treatment.
Claim 7
Dependent Claim
25 words
A process according to claim 1, wherein the film formed by the barrier coat has a static glass transition temperature of -30° to -60° C.
Claim 8
Dependent Claim
17 words
A process accoding to claim 6, wherein the static glass transition temperature is -40° to -55° C.
Claim 9
Dependent Claim
24 words
A process according to claim 1, wherein the modified polyolefin resin is obtained by graft-polymerizing maleic acid or maleic anhydride onto a polyolefin resin.
Claim 10
Dependent Claim
45 words
A process according to claim 8, wherein the modified polyolefin resin is obtained by graft-polymerizing 0.1 to 50 parts by weight of maleic acid or maleic anhydride onto 100 parts by weight of a propylene-ethylene copolymer having a propylene:ethylene mole ratio of 40:60 to 80:20.
Claim 11
Dependent Claim
52 words
A process according to claim 1, wherein the modified polyolefin resin is a blend of 100 parts by weight of a polyolefin resin and 1 to 90 parts by weight of a chlorinated polyolefin having a chlorination degree of 1 to 60% and a number average molecular weight of 10,000 to 1,000,000.
Claim 12
Dependent Claim
31 words
A process according to claim 10, wherein the polyolefin resin is a propylene-ethylene copolymer having a propylene:ethylene mole ratio of 40:60 to 80:20 and the chlorinated polyolefin is a chlorinated polypropylene.
Claim 13
Dependent Claim
29 words
A process according to claim 1, wherein the film formed by the barrier coat has an elongation at break of 200 to 1,000% in an atmosphere of -20° C.
Claim 14
Dependent Claim
21 words
A process according to claim 12, wherein the elongation at break is 300 to 800% in an atmosphere of -20° C.
Claim 15
Dependent Claim
14 words
A process according to claim 1, wherein the barrier coat contains an electroconductive substance.
Claim 16
Dependent Claim
32 words
A process according to claim 1, wherein the barrier coat contains at the most 150 parts by weight of an electroconductive substance per 100 parts by weight of the modified polyolefin resin.
Claim 17
Dependent Claim
14 words
A process according to claim 1, wherein the barrier coat contains a corrosion-preventive pigment.
Claim 18
Dependent Claim
25 words
A process according to claim 16, wherein the corrosion-preventive pigment is that of which aqueous extract has an electroconductivity of at least 100 μ /cm.
Claim 19
Dependent Claim
29 words
A process according to claim 16, wherein the barrier coat contains, per 100 parts by weight of the modified polyolefin resin, 1-150 parts by weight of the corrosion-preventive pigment.
Claim 20
Dependent Claim
27 words
A process according to claim 16, wherein the water absorption of the film formed of the cationic electrodeposition paint is within the range of 0.3-20% by weight.
Claim 21
Dependent Claim
15 words
A process according to claim 1, wherein the barrier coat is an organic solvent-base paint.
Claim 22
Dependent Claim
22 words
A process according to claim 1, wherein the film formed by the barrier coat has a thickness of 1 to 20 μ.
Claim 23
Dependent Claim
21 words
A process according to claim 1, wherein an intermediate coating paint is applied onto the barrier coat before applying top coat.
Claim 24
Dependent Claim
61 words
A process according to claim 22, wherein the intermediate coating pain is a thermosetting intermediate coating pain of an organic solvent-base paint or a water-base paint containing, as a vehicle main component, a combination of (1) a short oil ultra-short oil alkyd resin having an oil length of 30% or less and/or an oil-free polyester resin and (2) an amino resin.
Claim 25
Dependent Claim
26 words
A process according to claim 21, wherein the film formed by the intermediate coating paint has a pencil hardness of 3B to 6H at 20° C.
Claim 26
Dependent Claim
26 words
A process according to claim 21, wherein the film formed by the intermediate coating film has a thickness of 10 to 100 μ as cured film.
Claim 27
Dependent Claim
26 words
A process according to claim 1, wherein the top coating paint is a top coating paint of an alkyl-etherified amino resin/acrylic resin or an alkyd resin.
Claim 28
Dependent Claim
21 words
A process according to claim 1, wherein the top coating paint is a paint capable of forming an ultra-hard coating film.
Claim 29
Dependent Claim
25 words
A process according to claim 27, wherein the ultra-hard coating film has a pencil hardness of 4H to 9H at 20° C. as cured film.
Claim 30
Dependent Claim
30 words
A process according to claim 4 in which the cationic electrodeposition paint contains 55 to 100 parts by weight of pigments based on 100 parts by weight of resin solid.
Claim 31
Dependent Claim
16 words
A process according to claim 1, wherein the top coating paint is in a powder form.
Claim 32
Dependent Claim
14 words
A process according to claim 30, wherein the barrier coat contains a compatible solvent.
Claim 33
Dependent Claim
25 words
A process according to claim 30, wherein the barrier coat contains at least one deterioration inhibitor for resins, selected from ultraviolet absorbers, photostabilizers and anti-oxidants.
Claim 34
Dependent Claim
12 words
The automotive outer bodies coated according to the process of claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |