US4755435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coating steel panels
Assignee: Kansai Paint Co Ltd
•
Filing: 1985-11-08
•
Granted: 1988-07-05
•
Expires: 2005-11-08
Abstract
Abstract A process for coating a metallic substrate, characterized by applying on a metallic substrate a cation type electrocoating paint, applying thereon 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
2026-10-30 07:35
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/50; B05D7/56; B05D7/57; B05D7/577; B05D7/576; B05D7/58; B05D7/586; 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: 27
Claim 1
Independent Claim
214 words
A process for coating a metallic substrate, characterized by applying on a metallic substrate a cationic electrodeposition paint, applying thereon 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. 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 form 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° 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
214 words
A process for coating a metallic substrate, characterized by applying on a metallic substrate a cationic electrodeposition paint, applying thereon 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. 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 form 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° 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 reuslting resin in water.
Claim 4
Dependent Claim
29 words
A process according to claim 1, herein 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
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 7
Dependent Claim
17 words
A proces according to claim 5, wherein the static glass transition temperature is -40° to -55° C.
Claim 8
Dependent Claim
24 words
A process according to claim 1, wherein the modified polyolefin resin is obtained by graft-polymerizing a polyolefin resin with maleic acid or maleic anhydride.
Claim 9
Dependent Claim
46 words
A process according to claim 7, wherein the modified polyolefin resin is obtained by graft-polymerizing 100 parts by weight of a propylene-ethylene copolymer having a propylene: ethylene mole ratio of 40:60 to 80:20 with 0.1 to 50 parts by weight of maleic acid or maleic anhydride.
Claim 10
Dependent Claim
54 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 resin having a chlorination degree of 1 to 60% and having a number average molecular weight of 10,000 to 1,000,000.
Claim 11
Dependent Claim
31 words
A process according to claim 9, 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 12
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 13
Dependent Claim
21 words
A process according to claim 11, wherein the elongation at break is 300 to 800% in an atmosphere of -20° C.
Claim 14
Dependent Claim
15 words
A process according to claim 1, wherein the barrier coat is an organic solvent-base paint.
Claim 15
Dependent Claim
25 words
A process according to claim 1, wherein the film formed by the barrier coat is 1 to 20μ in terms of thickness of dried film.
Claim 16
Dependent Claim
24 words
A process according to claim 1, wherein an intermediate coating paint is applied to the barrier coat prior to application of the top coat.
Claim 17
Dependent Claim
59 words
A process according to claim 15, wherein the intermediate coating paint is a thermosetting intermediate coating paint of organic solvent-base or water-base paint containing, as a vehicle main component, a combination of (1) a short oil or 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 18
Dependent Claim
26 words
A process according to claim 15, wherein the film formed by the intermediate coating paint has a pencil hardness of 3B to 6H at 20° C.
Claim 19
Dependent Claim
29 words
A process according to claim 15, wherein the film formed by the intermediate coating film has a thickness of 10 to 100μ in terms of thickness of cured film.
Claim 20
Dependent Claim
28 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 alkyl-etherified amino resin/alkyd resin.
Claim 21
Dependent Claim
21 words
A process according to claim 1, wherein the top coating paint is a paint capble of forming an ultra-hard coating film.
Claim 22
Dependent Claim
29 words
A process according to claim 20, wherein the ultra-hard coating film has a pencil hardness of 4H to 9H at 20° C. in terms of hardness of cured film.
Claim 23
Dependent Claim
30 words
A process according to claim 4 in which the cationic electrodeposition pain contains 55 to 100 parts by weight of pigments based on 100 parts by weight of resin solid.
Claim 24
Dependent Claim
15 words
A process according to claim 22, wherein the top coating paint is in powder form.
Claim 25
Dependent Claim
14 words
A process according to claim 23, wherein the barrier coat contains a compatible solvent.
Claim 26
Dependent Claim
25 words
A process according to claim 22, wherein the barrier coat contains at least one deterioration inhibitor for resins, selected from ultraviolet absorbers, photostabilizers and anti-oxidants.
Claim 27
Dependent Claim
11 words
A metallic substrate coated according to the process of claim 1.
References Cited (Backward Citations)
US3922473A
Cited
US3998716A
Cited
US4139672A
Cited
US4175018A
Cited
US4370190A
Cited
US4259163A
Cited
US4312902A
Cited
US4358508A
Cited
US4481239A
Cited
US4508767A
Cited
US4529632A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |