US4707381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for finish coating on polyurethane formed articles
Assignee: Nissan Motor Co Ltd
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Filing: 1986-05-22
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Granted: 1987-11-17
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Expires: 2006-05-22
Abstract
Abstract A method for finish coating on polyurethane formed articles, which comprises formulating a finish coating composition so as to have a content of pyrrolidone or its derivative represented by the general formula <IMAGE> (I) in which R stands for hydrogen or an alkyl group having at the most 4 carbon atoms, in an amount of 5-40% by weight upon the coating, applying this finish coating composition on the polyurethane formed article directly and heating the so called polyurethane formed article at a temperature of at least 50 DEG C. but lower than the thermal deformation temperature of the polyurethane formed article, said method being capable of attaining a coating layer exhibiting both the properties for a primer coat, namely, a better adhesion onto polyurethane formed articles, and for a finish coat, namely, better weather resistance, higher chemical resistance, favorable appearance and so on, with only a single application and permitting thus to dispense with the primer coating and the heat drying procedure therefor.
Inventors
- 👤 Takashi Toyama
- 👤 Masashi Ohno
- 👤 Kiminori Ishii
- 👤 Shosaku Yamamoto
- 👤 Kazuo Kakinuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:33
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3412; C08K5/3415; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/044; C08J7/046; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
194 words
A method for finish coating a shaped, polyurethane article, which comprises: coating directly on the surface of a polyurethane article which has not been coated with a primer, a first coating layer of a finish paint composition comprising a first film-forming paint component selected from the group consisting of (1) a single-liquid thermosetting paint comprising a polyester resin or an acrylic resin, in combination with a cross-linking component selected from the group consisting of an aminoplast, a blocked aliphatic isocyanate and a blocked cycloaliphatic isocyanate, (2) a two-liquid urethane paint comprising a polyester resin or an acrylic resin, in combination with a cross-linking component selected from the group consisting of an aliphatic isocyanate and a cycloaliphatic isocyanate, and (3) a lacquer paint made from an acrylic resin, nitrocellulose or cellulose acetate butyrate, said finish paint composition containing from 5 to 40% by weight of at least one compound having the formula ##STR3## wherein R is hydrogen or alkyl having up to 4 carbon atoms; then heating the coated polyurethane article at a temperature of at least 50° C., but lower than the thermal deformation temperature of the polyurethane article, to cure said coating layer.
Claim 2
Independent Claim
194 words
A method for finish coating a shaped, polyurethane article, which comprises: coating directly on the surface of a polyurethane article which has not been coated with a primer, a first coating layer of a finish paint composition comprising a first film-forming paint component selected from the group consisting of (1) a single-liquid thermosetting paint comprising a polyester resin or an acrylic resin, in combination with a cross-linking component selected from the group consisting of an aminoplast, a blocked aliphatic isocyanate and a blocked cycloaliphatic isocyanate, (2) a two-liquid urethane paint comprising a polyester resin or an acrylic resin, in combination with a cross-linking component selected from the group consisting of an aliphatic isocyanate and a cycloaliphatic isocyanate, and (3) a lacquer paint made from an acrylic resin, nitrocellulose or cellulose acetate butyrate, said finish paint composition containing from 5 to 40% by weight of at least one compound having the formula ##STR3## wherein R is hydrogen or alkyl having up to 4 carbon atoms; then heating the coated polyurethane article at a temperature of at least 50° C., but lower than the thermal deformation temperature of the polyurethane article, to cure said coating layer.
Claim 3
Dependent Claim
26 words
A method according to claim 1, wherein said compound is at least one compound selected from the group consisting of 2-pyrrolidone, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, N-propyl-2-pyrrolidone and N-butyl-2-pyrrolidone.
Claim 4
Dependent Claim
54 words
A method according to claim 1, wherein after said coating step and before said heating step, the coated polyurethane article is coated with a topcoat of a transparent or clear lacquer, both of said coating layer and said topcoat comprising an acrylic resin or a polyester resin, in combination with an aminoplast or isocyanate.
Claim 5
Dependent Claim
32 words
A method according to claim 3 in which said first coating layer has a high content of pigment and said topcoat is free of pigment or contains a low content of pigment.
Claim 6
Dependent Claim
37 words
A method according to claim 4 in which said first coating layer contains from 3 to 95% by weight of said first film-forming paint component and the weight ratio of pigment/film-forming paint component is up to 3/1.
Claim 7
Dependent Claim
39 words
A method according to claim 1 in which said first coating layer contains pigment and from 3 to 95% by weight of said first film-forming paint component and the weight ratio of pigment/film-forming paint component is up to 3/1.
Claim 8
Dependent Claim
21 words
A method according to claim 1 in which said finish paint composition contains from zero to 92% by weight, of solvent.
Claim 9
Dependent Claim
36 words
A method according to claim 1 in which said first coating layer is an external decorative coating which is superior in weather resistance, has a pleasing aesthetic appearance and is capable of dissolving in said component.
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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) | 1990-11-16 | 1991-05-18 | 1991-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-16 | 1995-05-18 | 1995-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-16 | 1999-05-18 | 1999-11-17 | $7700.00 | Window Closed / Lapsed |