US3884868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating compositions comprising polyimides and polysiloxanes
Assignee: Phelps Dodge Industries Inc
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Filing: 1973-05-17
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Granted: 1975-05-20
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Expires: 1993-05-17
Abstract
Abstract A coating composition which when applied to a substrate and baked forms a non-porous, tough and durable coating exhibiting good release properties comparable to polytetrafluoroethylene TEFLON II coatings, good abrasion, cut and scratch resistance, and good resistance to thermal degradation. The coating composition comprises an essentially linear, high molecular weight polyaromatic polycarboxylic aromatic polyimide and may include certain polyfunctional organic substituted polysiloxanes and/or powdered fillers and pigments.
Inventors
- 👤 Robert T Trice
- 👤 Gordon D Mcleod
- 👤 Amos R Anderson
- 👤 Dennis C Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:33
CPC Classifications
A; A47; A47J; A47J36/00; A47J36/02; C; C08; C08L; C08L79/00; C08L79/04; C08L79/08; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
65 words
A NON-POROUS, DURABLE, TOUGH COATING COMPOSITION HAVING GOOD RELEASE PROPERTIES, GOOD RESISTANCE TO THERMAL DEGRADATION AND GOOD CUT, SCRATCH AND ABRASION RESISTANCE COMPRISING AN ESSENTIALY LINEAR, HIGH MOLECULAR WEIGHT POLYAROMATIC POLYCARBOXYLIC AROMATIC POLYMIDE AND A MISCIBLE PHENYL AND METHYL SUBSTITUTED POLYFUNCTIONAL POLYSILOXANE HAVING A DEGREE OF SUBSTITUTION FROM ABOUT 1.0 TO ABOUT 1.5 IN AN AMOUNT UP TO ABOUT 100 PERCENT WEIGHT OF SAID IMIDE.
Claim 2
Dependent Claim
65 words
A NON-POROUS, DURABLE, TOUGH COATING COMPOSITION HAVING GOOD RELEASE PROPERTIES, GOOD RESISTANCE TO THERMAL DEGRADATION AND GOOD CUT, SCRATCH AND ABRASION RESISTANCE COMPRISING AN ESSENTIALY LINEAR, HIGH MOLECULAR WEIGHT POLYAROMATIC POLYCARBOXYLIC AROMATIC POLYMIDE AND A MISCIBLE PHENYL AND METHYL SUBSTITUTED POLYFUNCTIONAL POLYSILOXANE HAVING A DEGREE OF SUBSTITUTION FROM ABOUT 1.0 TO ABOUT 1.5 IN AN AMOUNT UP TO ABOUT 100 PERCENT WEIGHT OF SAID IMIDE.
Claim 3
Dependent Claim
29 words
The composition of claim 1 wherein said imide is of the group consisting of poly(methylene p,p''-dianiline) amide-(methylene p, p''-dianiline) imide of trimellitic anhydride and the polyimides of pyromellitic dianhydride.
Claim 4
Dependent Claim
21 words
The composition of claim 2 wherein said polyimide is a reaction product of an aromatic diisocyanate and an aromatic tricarboxylic acid.
Claim 5
Dependent Claim
58 words
The composition of claim 1 wherein the amount of said polysiloxane is less than about 80 percent weight of said imide, and further comprising powdered filler and pigment up to about 1200% weight of said imide, said filler and pigment having a particle size less than 2.5 microns and 98 percent weight thereof passing a 325 mesh screen.
Claim 6
Dependent Claim
42 words
The composition of claim 1 further comprising powdered filler and pigment up to about 800 percent weight of said imide, said filler and pigment having a particle size less than 2.5 microns and 98 percent weight thereof passing a 325 mesh screen.
Claim 7
Dependent Claim
26 words
The composition of claim 5 wherein said pigment and filler comprise up to about 20 percent weight of said imide of a colored pigment and filler.
Claim 8
Dependent Claim
61 words
The composition of claim 5 wherein said polysiloxane is present in an amount of from about 60 percent to about 90 percent weight of said imide, said powdered filler and pigment are present in an amount of from about 50 percent to about 150 percent weight of said imide, said imide being a poly(methylene p,p''-dianiline) amide-(methylene p,p''-dianiline) imide of trimellitic anhydride.
Claim 9
Dependent Claim
13 words
The composition of claim 7 wherein said filler is a zirconium silicate powder.
Claim 10
Dependent Claim
31 words
The composition of claim 7 wherein said filler and pigment are chosen from the group consisting of zirconium silicate, silicon dioxide, titanium dioxide, aluminum oxide, iron oxide and carbon black powders.
Claim 11
Dependent Claim
80 words
A substrate coated with a layer of the composition of claim 9, said layer ranging in thickness from about 1.5 to about 4.0 mils, said layer withstanding in excess of about 200 cooking cycles, having an abrasion resistance measured by 1000 cycles of a Taber abraser of less than 200 milligrams weight loss, having excellent appearance after 500 cooking cycles, adhering to said substrate to an extent that scratching through said layer does not loosen said layer from said substrate.
Claim 12
Dependent Claim
28 words
The composition of claim 9 further comprising a solvent in an Amount in excess of about 300 percent weight of said imide whereby said composition is a solution.
Claim 13
Dependent Claim
16 words
The composition of claim 11 wherein said solvent comprises at least about two-thirds of said composition.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |