US5021297A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coating plastic substrates with powder coating compositions
Assignee: PPG Industries Inc
•
Filing: 1988-12-02
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Granted: 1991-06-04
•
Expires: 2008-12-02
Abstract
Abstract A process of coating a preformed plastic sustrate susceptible to gassing upon heating characterised by the steps of: a) preheating the substrate at temperatures and for a time sufficient to degas the substrate, said temperatures being above the temperature sufficient to cure a subsequently applied powder coating composition; b) applying immediately a powder coating composition to the preheated substrate above the temperature sufficient to cure the powder coating composition; and c) heating immediately the coated substrate at a temperature and for a time sufficient to cure the powder coating composition, is disclosed. The method is effective in sealing the substrate against popping.
Inventors
- 👤 Frederick F. Rhue
- 👤 William D. Franks
- 👤 Gary C. Craig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:19
CPC Classifications
B; B05; B05D; B05D1/00; B05D7/00; B05D7/02; B05D3/00; B05D3/02; B05D3/0218; C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/044; C08J7/08; B05D2401/00; B05D2401/30; B05D2401/32; B05D3/0254; C08J2367/00; C08J2367/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31616
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
89 words
A process of coating a preformed fiber-reinforced plastic substrate susceptible to gassing upon heating comprising: (a) preheating the substrate at temperatures and for time sufficient to degas the substrate, said temperatures above the temperature sufficient to cure a subsequently applied thermosetting powder coating composition; (b) applying immediately a thermosetting powder coating composition to the preheated substrate above the temperature sufficient to cure the thermosetting powder coating composition; and (c) heating immediately the coated substrate at a temperature and for a time sufficient to cure the thermosetting powder coating composition.
Claim 2
Dependent Claim
89 words
A process of coating a preformed fiber-reinforced plastic substrate susceptible to gassing upon heating comprising: (a) preheating the substrate at temperatures and for time sufficient to degas the substrate, said temperatures above the temperature sufficient to cure a subsequently applied thermosetting powder coating composition; (b) applying immediately a thermosetting powder coating composition to the preheated substrate above the temperature sufficient to cure the thermosetting powder coating composition; and (c) heating immediately the coated substrate at a temperature and for a time sufficient to cure the thermosetting powder coating composition.
Claim 3
Dependent Claim
17 words
The process of claim 1 in which the fiber-reinforced plastic substrate is a fiber glass-reinforced polyester substrate.
Claim 4
Dependent Claim
26 words
The process of claim 1 in which the substrate is preheated at 300° F. (149° C.) to 400° F. (204° C.) for at least 15 minutes.
Claim 5
Dependent Claim
24 words
The process of claim 1 in which the thermosetting powder coating composition is based on an epoxy-containing acrylic polymer and a polyacid curing agent.
Claim 6
Dependent Claim
23 words
The process of claim 1 in which the thermosetting powder coating composition is applied at a thickness of about 3 to 6 mils.
Claim 7
Dependent Claim
27 words
The process of claim 1 in which the coated substrate is heated at 250° F. (121° C.) to 375° F. (191° C.) for at least 15 minutes.
Claim 8
Dependent Claim
17 words
The process of claim 1 in which the coated substrate is subsequently topcoated with a finish coat.
Claim 9
Dependent Claim
14 words
The process of claim 7 in which the finish coat is cured by heating.
Claim 10
Dependent Claim
9 words
An article coated by the method of claim 7.
Claim 11
Dependent Claim
9 words
An article coated by the method of claim 1.
Claim 12
Dependent Claim
112 words
A process of coating a preformed glass fiber-reinforced polyester substrate susceptible to gassing upon heating comprising: (a) preheating the substrate at a temperature of at least 300° F. (149° C.) for at least 15 minutes to degas the substrate, said temperature being above the temperature sufficient to cure a subsequently applied thermosetting powder coating composition; (b) applying immediately a thermosetting powder coating composition at a thickness of from 3 to 6 mils to the preheated substrate above the temperature sufficient to cure the thermosetting powder coating composition; and (c) heating at a temperature of at least 250° F. (121° C.) for at least 15 minutes until the powder coating composition is cured.
Claim 13
Dependent Claim
112 words
A process of coating a preformed glass fiber-reinforced polyester substrate susceptible to gassing upon heating comprising: (a) preheating the substrate at a temperature of at least 300° F. (149° C.) for at least 15 minutes to degas the substrate, said temperature being above the temperature sufficient to cure a subsequently applied thermosetting powder coating composition; (b) applying immediately a thermosetting powder coating composition at a thickness of from 3 to 6 mils to the preheated substrate above the temperature sufficient to cure the thermosetting powder coating composition; and (c) heating at a temperature of at least 250° F. (121° C.) for at least 15 minutes until the powder coating composition is cured.
Claim 14
Dependent Claim
24 words
The process of claim 11 in which the thermosetting powder coating composition is based on an epoxy-containing acrylic polymer and a polyacid curing agent.
Claim 15
Dependent Claim
24 words
The process of claim 11 in which the coated substrate is subsequently topcoated with a finish coat and the finish coat cured by heating.
Claim 16
Dependent Claim
9 words
An article coated by the method of claim 13.
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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) | 1994-06-03 | 1994-12-03 | 1995-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-03 | 1998-12-03 | 1999-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-03 | 2002-12-03 | 2003-06-04 | $7700.00 | Window Closed / Lapsed |