US3843593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radar absorptive coating composition of an acrylic polymer,a polyester and an isocyanate cross-linking agent
Assignee: EIDP Inc
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Filing: 1972-06-05
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Granted: 1974-10-22
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Expires: 1992-06-05
Abstract
Abstract A coating composition that forms a durable, flexible radar absorptive coating for aircraft that contains as the binder AN ACRYLIC GRAFT COPOLYMER HAVING ATTACHED TO ITS BACKBONE SIDE CHAIN ESTER UNITS HAVING REACTIVE HYDROXYL GROUPS; A HYDROXYL TERMINATED LINEAR POLYESTER OF A SATURATED ALIPHATIC OR AROMATIC DICARBOXYLIC ACID AND AN ALIPHATIC GLYCOL OR AN OLEFIN OXIDE HAVING A TERMINAL OXIRANE GROUP; AN ORGANIC POLYISOCYANATE CROSS-LINKING AGENT; AND CONTAINS 60-90 PERCENT BY WEIGHT, BASED ON THE WEIGHT OF THE BINDER, OF A CARBONYL IRON PIGMENT; THE COMPOSITION IS PARTICULARLY USEFUL AS A COATING ON MILITARY AIRCRAFT WHICH ABSORBS RADAR; PIGMENTATION OF THE BINDER WITH IRON OXIDE OR CHROMIUM OXIDE PIGMENT PROVIDES A COATING FOR MAGNETIC TAPES; THE BINDER CAN ALSO BE USED AS AN AUTOMOTIVE BUMPER FINISH.
Inventors
- 👤 T Shell
- 👤 J Vasta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:39
CPC Classifications
H; H01; H01Q; H01Q17/00; H01Q17/004; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/4009; C08G18/4063; C08G18/62; C08G18/6216; C08G18/622; C08G18/6225; C08G18/6229; C08G18/6233; C09; C09D; C09D151/00; C09D151/003; C09D175/00; C09D175/04; C09D5/00; C09D5/30; F; F41; F41H; F41H3/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31681
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
19 words
A COATING COMPOSITION COMPRISING 10-70 PERCENT WEIGHT OF A FILM-FORMING BINDER CONSISTS ESSENTIALLY OF FILM-FORMING BINDER CONSISTS ESSENTIALLY OF
Claim 2
Dependent Claim
19 words
A COATING COMPOSITION COMPRISING 10-70 PERCENT WEIGHT OF A FILM-FORMING BINDER CONSISTS ESSENTIALLY OF FILM-FORMING BINDER CONSISTS ESSENTIALLY OF
Claim 3
Dependent Claim
83 words
A RESIN BLEND OF 50-85 PERCENT BY WEIGHT OF A GRAFT,COPOLYMER HAVING A BACKBONE OF POLYMERIZED MONOMERS SELECTED FROM THE GROUP CONSISING OF POLYMERIZED MONOMERS OF AN AROMATIC HYDROCARBON HAVING VINYLENE GROUPS, AN ALKYL ACRYLATE, AN ALKYL MELTHACRYLATE, ACRYLONITRILE, METHACRYLONITRILE AND MIXTURES THEREOF WHEREIN THE ALKYL GROUPS HAVE 1-8 CARBON ATOMS AND HAVING ESTER GROUPS ATTACHED DIRECTLY TO ITS BACKBONE, SAID ESTER GROUPS COMPRISING ABOUT 10 TO 75 PERCENT OF THE TOTAL WEIGHT OF THE POLYMER AND CONSISTING ESSENTIALLY OF ESTER GROUP (A)
Claim 4
Dependent Claim
83 words
A RESIN BLEND OF 50-85 PERCENT BY WEIGHT OF A GRAFT,COPOLYMER HAVING A BACKBONE OF POLYMERIZED MONOMERS SELECTED FROM THE GROUP CONSISING OF POLYMERIZED MONOMERS OF AN AROMATIC HYDROCARBON HAVING VINYLENE GROUPS, AN ALKYL ACRYLATE, AN ALKYL MELTHACRYLATE, ACRYLONITRILE, METHACRYLONITRILE AND MIXTURES THEREOF WHEREIN THE ALKYL GROUPS HAVE 1-8 CARBON ATOMS AND HAVING ESTER GROUPS ATTACHED DIRECTLY TO ITS BACKBONE, SAID ESTER GROUPS COMPRISING ABOUT 10 TO 75 PERCENT OF THE TOTAL WEIGHT OF THE POLYMER AND CONSISTING ESSENTIALLY OF ESTER GROUP (A)
Claim 5
Dependent Claim
53 words
A POLYISOCYANATE WHEREIN THE MOLAR RATIO OF ISOCYANATE TO HYDROXYL OF THE RESIN BLEND IS ABOUT 1:1 TO ABOUT 1:1.25; AND THE COATING COMPOSITION CONTAINS ABOUT 50-90 PERCENT BY WEIGHT, BASED ON THE WEIGHT OF THE FILM-FORMING BINDER, OF UNIFORMLY DISPERSED CARBONYL IRON PIGMENT HAVING A PARTICLE SIZE OF 0.5 - 15 MICRONS.
Claim 6
Dependent Claim
53 words
A POLYISOCYANATE WHEREIN THE MOLAR RATIO OF ISOCYANATE TO HYDROXYL OF THE RESIN BLEND IS ABOUT 1:1 TO ABOUT 1:1.25; AND THE COATING COMPOSITION CONTAINS ABOUT 50-90 PERCENT BY WEIGHT, BASED ON THE WEIGHT OF THE FILM-FORMING BINDER, OF UNIFORMLY DISPERSED CARBONYL IRON PIGMENT HAVING A PARTICLE SIZE OF 0.5 - 15 MICRONS.
Claim 7
Dependent Claim
52 words
a polyisocyanate wherein the molar ratio of isocyanate to hydroxyl of the resin blend is about 1:1 to about 1:1.25; and the coating composition contains about 50-90 percent by weight, based on the weight of the film-forming binder, of uniformly dispersed carbonyl iron pigment having a particLe size of 0.5 -15 microns.
Claim 8
Dependent Claim
52 words
a polyisocyanate wherein the molar ratio of isocyanate to hydroxyl of the resin blend is about 1:1 to about 1:1.25; and the coating composition contains about 50-90 percent by weight, based on the weight of the film-forming binder, of uniformly dispersed carbonyl iron pigment having a particLe size of 0.5 -15 microns.
Claim 9
Dependent Claim
52 words
The coating composition of claim 1 having a binder content of 30-60 percent by weight and wherein the binder consists essentially of a polymer blend 60-80 percent by weight of the graft copolymer, 20-40 percent by weight of the polyester and the molar ratio of isocyanate to hydroxyl is maintained at 1:1.
Claim 10
Dependent Claim
21 words
the polyisocyanate is the biuret of hexamethylene diisocyanate and wherein the carbonyl iron pigment has a particle size of 6-9 microns.
Claim 11
Dependent Claim
21 words
the polyisocyanate is the biuret of hexamethylene diisocyanate and wherein the carbonyl iron pigment has a particle size of 6-9 microns.
Claim 12
Dependent Claim
7 words
an aliphatic glycol having 2-8 carbon atoms.
Claim 13
Dependent Claim
7 words
an aliphatic glycol having 2-8 carbon atoms.
Claim 14
Dependent Claim
75 words
The coating composition of claim 2 wherein the graft copolymer has a backbone consisting essentially of styrene and an acrylic ester selected from the group consisting of an alkyl methacrylate, an alkyl acrylate and mixture thereof in which the alkyl group contains 1-8 carbon atoms; in which R1 is a saturated hydrocarbon group having 2-4 carbon atoms, R2 is an aromatic radical, and R3 is a tertiary hydrocarbon group having 8 through 10 carbon atoms.
Claim 15
Dependent Claim
12 words
The coating composition of claim 2 wherein the polyester consists essentially of
Claim 16
Dependent Claim
14 words
The coating composition of claim 2 in which the polyisocyanate is of the formula
Claim 17
Dependent Claim
7 words
The coating composition of claim 2 wherein
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |