US4521485A
Expired / Lapsed
US
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Electrical insulation
Assignee: Raychem Corp
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Filing: 1983-09-27
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Granted: 1985-06-04
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Expires: 2003-09-27
Abstract
Abstract Electrical insulation comprises (1) an inner layer of a cross-linked polymer, e.g. polyethylene, an ethylene/tetrafluoroethylene copolymer, an ethylene/chlorotrifluoroethylene polymer or a vinylidene fluoride polymer, and (2) an outer layer of an aromatic polymer having a glass transition temperature of at least 100° C., e.g. a polyether ether ketone, a polyether ketone or a polyether sulfone. Such insulation combines excellent properties under normal service conditions with low smoke evolution on burning, and is therefore particularly useful for aircraft wire and cable.
Inventors
- 👤 Stephen L. Tondre
- 👤 Hans E. Lunk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:26
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/29; H01B7/295; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2947
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
103 words
An insulated electrical article, comprising (a) a conductor; (b) a melt-shaped inner insulating layer comprising a first organic polymer component which is a cross-linked fluorocarbon polymer containing more than 10% by weight fluorine, and (c) a melt-shaped outer insulating layer which contacts the inner insulating layer and which comprises a second organic polymer component which is a substantially linear aromatic polymer having a glass transition temperature of at least 100° C. and which comprises units of the formula --Ar--Q-- wherein Ar is a polyvalent aromatic radical and Q is a radical of the formula --O-- --S-- --SO.sub.2 -- --CO-- --NH.CO-- --COO-- or ##STR8##
Claim 2
Dependent Claim
103 words
An insulated electrical article, comprising (a) a conductor; (b) a melt-shaped inner insulating layer comprising a first organic polymer component which is a cross-linked fluorocarbon polymer containing more than 10% by weight fluorine, and (c) a melt-shaped outer insulating layer which contacts the inner insulating layer and which comprises a second organic polymer component which is a substantially linear aromatic polymer having a glass transition temperature of at least 100° C. and which comprises units of the formula --Ar--Q-- wherein Ar is a polyvalent aromatic radical and Q is a radical of the formula --O-- --S-- --SO.sub.2 -- --CO-- --NH.CO-- --COO-- or ##STR8##
Claim 3
Dependent Claim
27 words
An article according to claim 1 wherein the inner layer is in contact with the conductor, and the outer layer is in contact with the inner layer.
Claim 4
Dependent Claim
13 words
An article according to claim 1 wherein the inner layer is radiation cross-linked.
Claim 5
Dependent Claim
18 words
An article according to claim 1 wherein the fluorocarbon polymer contains more than 25% by weight of fluorine.
Claim 6
Dependent Claim
29 words
An article according to claim 1 wherein the fluorocarbon polymer consists essentially of a polymer selected from the group consisting of ethylene/tetrafluorethylene copolymers, ethylene/chlorotrifluorethylene copolymers and vinylidene fluoride polymers.
Claim 7
Dependent Claim
23 words
An article according to claim 1 wherein the aromatic polymer is a crystalline polymer having a melting point of at least 250° C.
Claim 8
Dependent Claim
73 words
An article according to claim 1 wherein the aromatic polymer is a crystalline polyarylene ether comprising recurring units of the formula --O--E--O--E'-- where E is the residue of a dihydric phenol and E' is the residue of an aromatic compound having an electron-withdrawing group in at least one of the positions ortho and para to the valence bonds; the E and E' radicals being linked to the --O-- radicals through aromatic carbon atoms.
Claim 9
Dependent Claim
19 words
An article according to claim 1 wherein the aromatic polymer consists essentially of repeating units of the formula ##STR9##
Claim 10
Dependent Claim
19 words
An article according to claim 1 wherein the aromatic polymer consists essentially of repeating units of the formula ##STR10##
Claim 11
Dependent Claim
60 words
An article according to claim 1 wherein the aromatic polymer consists essentially of repeating units of the formula ##STR11## wherein each of x, m and n is 0 or 1, with n being 0 when x is 1, p is an integer from 1 to 4, with m being 1 and x being 0 when p is greater than 1.
Claim 12
Dependent Claim
19 words
An article according to claim 1 wherein the aromatic polymer consists essentially of repeating units of the formula ##STR12##
Claim 13
Dependent Claim
19 words
An article according to claim 1 wherein the aromatic polymer consists essentially of repeating units of the formula ##STR13##
Claim 14
Dependent Claim
60 words
An article according to claim 1 wherein the aromatic polymer consists essentially of repeating units of the formula ##STR14## wherein each of x, m and n is 0 or 1, with n being 0 when x is 1, p is an integer from 1 to 4, with m being 1 and x being 0 when p is greater than 1.
Claim 15
Dependent Claim
112 words
Electrical cable which comprises (a) a conductor, (b) a melt-extruded inner insulating layer which surrounds and contacts the conductor and which comprises a first organic polymer component which is a cross-linked fluorocarbon polymer containing more than 10% by weight fluorine, and (c) a melt-extruded outer insulating layer which surrounds and contacts the inner insulating layer and which comprises a second organic polymer component which is a substantially linear aromatic polymer having a glass transition temperature of at least 100° C., and which comprises units of the formula --Ar--Q-- wherein Ar is a polyvalent aromatic radical and Q is a radical of the formula --O-- --S-- --SO.sub.2 -- --CO-- --NH.CO-- --COO-- or ##STR15##
Claim 16
Dependent Claim
112 words
Electrical cable which comprises (a) a conductor, (b) a melt-extruded inner insulating layer which surrounds and contacts the conductor and which comprises a first organic polymer component which is a cross-linked fluorocarbon polymer containing more than 10% by weight fluorine, and (c) a melt-extruded outer insulating layer which surrounds and contacts the inner insulating layer and which comprises a second organic polymer component which is a substantially linear aromatic polymer having a glass transition temperature of at least 100° C., and which comprises units of the formula --Ar--Q-- wherein Ar is a polyvalent aromatic radical and Q is a radical of the formula --O-- --S-- --SO.sub.2 -- --CO-- --NH.CO-- --COO-- or ##STR15##
Claim 17
Dependent Claim
39 words
Cable according to claim 14 wherein the inner layer is of annular cross-section with a wall thickness of 3 to 10 mils, and the outer layer is of annular cross-section with a wall thickness of 3 to 15 mils.
Claim 18
Dependent Claim
16 words
Cable according to claim 14 wherein the first organic polymer component is a cross-linked ethylene/tetrafluoroethylene copolymer.
Claim 19
Dependent Claim
34 words
Cable according to claim 16 wherein the aromatic polymer is a crystalline polymer which has a melting point of at least 250° C. and which consists essentially of said units of the formula --Ar--Q--
Claim 20
Dependent Claim
14 words
Cable according to claim 17 wherein the aromatic polymer is a polyether ether ketone.
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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) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |