Patent US3877970A successfully refreshed from Google Patents.
US3877970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective curing of multiple layers of polyarylene sulfide coatings
Assignee: Phillips Petroleum Co
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Filing: 1973-09-26
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Granted: 1975-04-15
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Expires: 1993-09-26
Abstract
Abstract An arylene sulfide coating composition containing a fluorocarbon polymer is applied as a first or base coat to a substrate and cured under conditions to give only a partial cure. Multiple base coats can be applied and each partially cured prior to application of the next coat. Thereafter a single top coat of poly(arylene sulfide) is applied and the final coating cured under normal curing conditions.
Inventors
- 👤 Jr James T Edmonds
- 👤 Jennings P Blackwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:52
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/50; B05D7/52; B05D7/54; B05D7/546; B05D2506/00; B05D2506/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
167 words
A METHOD FOR COATING A SUBSTRATE WITH AN ARYLENE SULFIDE POLYMER COMPOSITION COMPRISING APPLYING AT LEAST ONE BASE COAT OF SAID ARYLENE SULFIDE POLYMER CONTAINING A FLUOROCARBON POLYMER OF SUFFICIENTLY LOWER MOLECULAR WEIGHT TO EXHIBIT SOME FLOW UNDER ASTMD 1238 MELT FLOW TEST AT 380*C WITH A 5000 G WEIGHT AND CURING SAID THUS FORMED BASE COAT AT A FIRST ELEVATED TEMPERATURE WITHIN THE RANGE OF 225* TO 610*F FOR A TIME, T IN MINUTES NO MORE THAN AN AMOUNT REPRESENTED BY THE EQUATION T=(-T/20) + 62 WHEREIN T IS AN INTEGER CORRESPONDING TO SAID FIRST ELEVATED TEMPERATURE IN *F, SO AS TO GIVE AN INCOMPLETE CURE; AND THEREAFTER APPLYING A TOP COAT OF ARYLENE JECTING THE THUS-COATED SUBSTRATE TO A SECOND ELEVATED TEMPERATURE WITHIN THE RANGE OF 650* TO 900*F FOR A TIME IN MINUTES T'', GREATER THAN THE REPRESENTED BY THE FORMULA T'' =(-2T/25) + 77 WHEREIN T'' IS AN INTEGER CORRESPONDING TO SAID SECOND ELEVATED TEMPERATURE IN *F, TO GIVE A RELATIVELY COMPLETE CURE.
Claim 2
Independent Claim
167 words
A METHOD FOR COATING A SUBSTRATE WITH AN ARYLENE SULFIDE POLYMER COMPOSITION COMPRISING APPLYING AT LEAST ONE BASE COAT OF SAID ARYLENE SULFIDE POLYMER CONTAINING A FLUOROCARBON POLYMER OF SUFFICIENTLY LOWER MOLECULAR WEIGHT TO EXHIBIT SOME FLOW UNDER ASTMD 1238 MELT FLOW TEST AT 380*C WITH A 5000 G WEIGHT AND CURING SAID THUS FORMED BASE COAT AT A FIRST ELEVATED TEMPERATURE WITHIN THE RANGE OF 225* TO 610*F FOR A TIME, T IN MINUTES NO MORE THAN AN AMOUNT REPRESENTED BY THE EQUATION T=(-T/20) + 62 WHEREIN T IS AN INTEGER CORRESPONDING TO SAID FIRST ELEVATED TEMPERATURE IN *F, SO AS TO GIVE AN INCOMPLETE CURE; AND THEREAFTER APPLYING A TOP COAT OF ARYLENE JECTING THE THUS-COATED SUBSTRATE TO A SECOND ELEVATED TEMPERATURE WITHIN THE RANGE OF 650* TO 900*F FOR A TIME IN MINUTES T'', GREATER THAN THE REPRESENTED BY THE FORMULA T'' =(-2T/25) + 77 WHEREIN T'' IS AN INTEGER CORRESPONDING TO SAID SECOND ELEVATED TEMPERATURE IN *F, TO GIVE A RELATIVELY COMPLETE CURE.
Claim 3
Dependent Claim
19 words
A method according to claim 1 wherein said first elevated temperature is within the range of 250* to 600*F.
Claim 4
Dependent Claim
21 words
A method according to claim 1 wherein said first elevated temperature is below the melting point of said arylene sulfide polymer.
Claim 5
Dependent Claim
37 words
A method according to claim 1 wherein said fluorocarbon polymer is polytetrafluoroethylene having a melt viscosity within the range of 1 X 104 and 1 X 105 poise as calculated from flow obtained by said ASTM test.
Claim 6
Dependent Claim
14 words
A method according to claim 1 wherein said arylene sulfide polymer is polyphenylene sulfide.
Claim 7
Dependent Claim
15 words
A method according to claim 1 wherein said substrate is one of metal or ceramic.
Claim 8
Dependent Claim
42 words
A method according to claim 1 wherein said fluorocarbon polymer in each of said coats is present in an amount within the range of 10 to 40 weight per cent based on the weight of said arylene sulfide polymer in each coat.
Claim 9
Dependent Claim
36 words
A method according to claim 1 wherein said time, t in minutes, is at least an amount represented by the equation t (-T/60) + 16 where T is said integer corresponding to said first elevated temperature.
Claim 10
Dependent Claim
93 words
A method according to claim 1 wherein each of said coats is applied in the form of an aqueous slurry containing a non-ionic surfactant and wherein said fluorocarbon polymer is present in each of said slurries in an amount within the range of 10 to 15 parts by weight based on 100 parts by weight of said arylene sulfide polymer in that slurry and wherein each of said slurries comprises in addition 10-50 parts by weight of a pigment based on 100 parts by weight of said arylene sulfide polymer in that slurry.
Claim 11
Dependent Claim
66 words
A method according to claim 1 wherein said base coat is cured at a temperature within the range of 500* to 600*F for a time within the range of 10 to 30 minutes and said coated substrate after application of said top coat is cured at a temperature within the range of 700* to 800*F for a time within the range of 30 to 60 minutes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |