US4824723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame resistant electrical insulating material
Assignee: General Electric Co
•
Filing: 1986-06-02
•
Granted: 1989-04-25
•
Expires: 2006-06-02
Abstract
Abstract A flame resistant electrically insulating multilayer material is described herein, in which a flame resistant core which may be comprised of coextrudable, thermoformable thermoplastic materials has at least one electrically insulating outer layer attached thereto. Preferred polymeric materials forming the core include blends of polycarbonates with halogen-containing polycarbonates. Each outer layer typically may be formed from polycarbonates and linear polyesters. The multilayer material may be shaped to surround and shield any sensitive device requiring protection from high voltage arcing or fire.
Inventors
- 👤 Richard W. Campbell
- 👤 Kirk L. Kimbel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:44
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; H01B3/421; H01B7/00; H01B7/17; H01B7/29; H01B7/295; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/266; Y10T428/31504; Y10T428/31507; Y10T428/31551; Y10T428/31565; Y10T428/31725; Y10T428/31736; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
91 words
A coextruded flame resistant electrically insulating multilayer material comprising a flame resistant core, said core comprised of a thermoplastic polymer selected from the group comprising polyolefins, poly(aryl ethers), polyetherimides, polyamides, poly(aryl sulfones), thermoplastic polyurethanes, alkenyl aromatic polymers, acrylic-based polymers, polycarbonates, nitrile barrier resins, thermoplastic polyester, and blends of said polymers blended with a flame retardant and an electrically insulating first thermoplastic outer layer wherein said thermoplastic core is the only flame resistant polymer in said multilayer material and wherein said flame retardant is the only flame retardant in said multilayer material.
Claim 2
Dependent Claim
91 words
A coextruded flame resistant electrically insulating multilayer material comprising a flame resistant core, said core comprised of a thermoplastic polymer selected from the group comprising polyolefins, poly(aryl ethers), polyetherimides, polyamides, poly(aryl sulfones), thermoplastic polyurethanes, alkenyl aromatic polymers, acrylic-based polymers, polycarbonates, nitrile barrier resins, thermoplastic polyester, and blends of said polymers blended with a flame retardant and an electrically insulating first thermoplastic outer layer wherein said thermoplastic core is the only flame resistant polymer in said multilayer material and wherein said flame retardant is the only flame retardant in said multilayer material.
Claim 3
Dependent Claim
26 words
The material of claim 1 further comprising an electrically insulating second thermoplastic outer layer attached to a second surface of the core opposite the first surface.
Claim 4
Dependent Claim
27 words
The material of claim 2 wherein the first and second outer layers are formed from polymers or copolymers selected from the group consisting of polyesters and polycarbonates.
Claim 5
Dependent Claim
17 words
The material of claim 2 wherein the core and first and second outer layers are extruded simultaneously.
Claim 6
Dependent Claim
16 words
The material of claim 2 wherein the core is formed from at least one thermoformable material.
Claim 7
Dependent Claim
13 words
The material of claim 2 wherein the thermoplastic polymer core is a polycarbonate.
Claim 8
Dependent Claim
22 words
The material of claim 6 wherein the halogen-containing organic compound is a copolycarbonate derived from a halogenated bisphenol-A and a dihydric phenol.
Claim 9
Dependent Claim
111 words
A coextruded flame resistant electrically insulating multilayer material comprising a flame resistant core, said core comprised of a thermoplastic polycarbonate polymer blended with a flame retardant comprised of a copolycarbonate derived from a halogenated bisphenol -A and a dihydric phenol, and electrically insulating first and second thermoplastic outer layers attached to a first and second surface of the core, respectively, said second surface of the core opposite to said first surface and wherein the first and second thermoplastic outer layers are polyesters and wherein said thermoplastic core is the only flame resistant polymer in said multilayer material and wherein said flame retardant is the only flame retardant in said multilayer material.
Claim 10
Dependent Claim
111 words
A coextruded flame resistant electrically insulating multilayer material comprising a flame resistant core, said core comprised of a thermoplastic polycarbonate polymer blended with a flame retardant comprised of a copolycarbonate derived from a halogenated bisphenol -A and a dihydric phenol, and electrically insulating first and second thermoplastic outer layers attached to a first and second surface of the core, respectively, said second surface of the core opposite to said first surface and wherein the first and second thermoplastic outer layers are polyesters and wherein said thermoplastic core is the only flame resistant polymer in said multilayer material and wherein said flame retardant is the only flame retardant in said multilayer material.
Claim 11
Dependent Claim
18 words
The material of claim 8 wherein the polyester forming the first and second outer layers is poly(ethylene terephthalate).
Claim 12
Dependent Claim
36 words
The material of claim 8 wherein the polyester forming the first and second outer layers is a blend of a polymer derived from cyclohexanedimethanol and a mixture of iso- and terephthalic acids with an aromatic polycarbonate.
Claim 13
Dependent Claim
69 words
A coextrudable and thermoformable multilayer material exhibiting flame resistance and electrical insulative capability, comprising a flame resistant core formed from an aromatic polycarbonate blended with a copolycarbonate derived from a halogenated bisphenol-A and a dihydric phenol, and first and second outer layers attached to first and second surfaces of the core, respectively, said outer layers formed from polymers or copolymers selected from the group consisting of polyesters and polycarbonates.
Claim 14
Dependent Claim
69 words
A coextrudable and thermoformable multilayer material exhibiting flame resistance and electrical insulative capability, comprising a flame resistant core formed from an aromatic polycarbonate blended with a copolycarbonate derived from a halogenated bisphenol-A and a dihydric phenol, and first and second outer layers attached to first and second surfaces of the core, respectively, said outer layers formed from polymers or copolymers selected from the group consisting of polyesters and polycarbonates.
Claim 15
Dependent Claim
19 words
The multilayer material of claim 11 wherein the polymer forming the first and second outer layers is poly(ethylene terephthalate).
Claim 16
Dependent Claim
37 words
The multilayer material of claim 11 wherein the polymer forming the first and second outer layers comprises: (a) a polyester derived from cyclohexanedimethanol and a mixture of iso- and terephthalic acids; and (b) an aromatic carbonate polymer.
Claim 17
Dependent Claim
73 words
A coextruded flame retardant electrically insulating multilayer material comprising a flame retardant core, said core comprised of a polycarbonate blended with a halogenated copolycarbonate, and an electrically insulating first thermoplastic outer layer comprised of polymers or copolymers selected from the group consisting of polyesters and polycarbonates, wherein said core is the only flame resistant polymer in said multilayer material and wherein said halogenated copolycarbonate is the only flame retardant in said multilayer material.
Claim 18
Dependent Claim
73 words
A coextruded flame retardant electrically insulating multilayer material comprising a flame retardant core, said core comprised of a polycarbonate blended with a halogenated copolycarbonate, and an electrically insulating first thermoplastic outer layer comprised of polymers or copolymers selected from the group consisting of polyesters and polycarbonates, wherein said core is the only flame resistant polymer in said multilayer material and wherein said halogenated copolycarbonate is the only flame retardant in said multilayer material.
Claim 19
Dependent Claim
20 words
A multilayer material according to claim 14 wherein said outer layer has a thickness of greater than about 1 mil.
Claim 20
Dependent Claim
22 words
A multilayer material according to claim 14 wherein said outer layer has a thickness of from about 1 to about 10 mils.
Claim 21
Dependent Claim
22 words
A multilayer material according to claim 14 wherein said outer layer has a thickness of from about 1 to about 7 mils.
Claim 22
Dependent Claim
19 words
A multilayer material according to claim 14 wherein said core has a thickness of greater than about 4 mils.
Claim 23
Dependent Claim
21 words
A multilayer material according to claim 14 wherein said core has a thickness of from about 4 to about 240 mils.
Claim 24
Dependent Claim
21 words
A multilayer material according to claim 14 wherein said core has a thickness of from about 12 to about 22 mils.
Claim 25
Dependent Claim
22 words
A multilayer material according to claim 11 wherein each of said outer layers has a thickness of greater than about 1 mil.
Claim 26
Dependent Claim
24 words
A multilayer material according to claim 11 wherein each of said outer layers has a thickness of from about 1 to about 10 mils.
Claim 27
Dependent Claim
24 words
A multilayer material according to claim 11 wherein each of said outer layers has a thickness of from about 1 to about 7 mils.
Claim 28
Dependent Claim
19 words
A multilayer material according to claim 11 wherein said core has a thickness of greater than about 4 mils.
Claim 29
Dependent Claim
21 words
A multilayer material according to claim 11 wherein said core has a thickness of from about 4 to about 240 mils.
Claim 30
Dependent Claim
21 words
A multilayer material according to claim 11 wherein said core has a thickness of from about 12 to about 22 mils.
Claim 31
Dependent Claim
18 words
A multilayer material according to claim 11 wherein each of said outer layers are substantially equal in thickness.
Claim 32
Dependent Claim
26 words
A multilayer material according to claim 11 wherein the total thickness of the core and said outer layers is from about 20 to about 30 mils.
Claim 33
Dependent Claim
112 words
A coextruded flame resistant electrically insulating multilayer material comprising a flame resistant core, said core comprised of a thermoplastic polymer selected from the group consisting of polyolefins, poly(aryl ethers), polyether imides, polyamides, poly(aryl sulfones), polyurethanes, alkenyl aromatic polymers, acrylic-based polymers, polycarbonates, nitrile barrier resins, and copolymers, mixtures and blends of the foregoing, blended with a flame retardant, and an electrically insulating first thermoplastic outer layer selected from the group consisting of polyesters, polycarbonates, polyphthalate carbonates, copolyestercarbonates and copolymers, mixtures and blends of the foregoing, wherein said thermoplastic core is the only flame resistant polymer in said multilayer material and wherein said flame retardant is the only flame retardant in said multilayer material.
Claim 34
Dependent Claim
112 words
A coextruded flame resistant electrically insulating multilayer material comprising a flame resistant core, said core comprised of a thermoplastic polymer selected from the group consisting of polyolefins, poly(aryl ethers), polyether imides, polyamides, poly(aryl sulfones), polyurethanes, alkenyl aromatic polymers, acrylic-based polymers, polycarbonates, nitrile barrier resins, and copolymers, mixtures and blends of the foregoing, blended with a flame retardant, and an electrically insulating first thermoplastic outer layer selected from the group consisting of polyesters, polycarbonates, polyphthalate carbonates, copolyestercarbonates and copolymers, mixtures and blends of the foregoing, wherein said thermoplastic core is the only flame resistant polymer in said multilayer material and wherein said flame retardant is the only flame retardant in said multilayer material.
Claim 35
Dependent Claim
63 words
A multilayer material according to claim 29 wherein said flame retardant is selected from the group consisting of chlorinated hydrocarbons, brominated hydrocarbons, halogenated organo phosphorous compounds, non-halogenated organo phosphorous compounds, zinc salts, antimony salts, aluminum salts, molybdenum salts, brominated aromatics, brominated aliphatic polyols, phosphorous-containing polyols, an admixture of an aromatic polycarbonate and a polytetrafluoro ethylene (PTFE), and mixtures of any of the foregoing.
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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) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |