Patent US4521485A successfully refreshed from Google Patents.
US4521485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical insulation
Assignee: Raychem Corp
•
Filing: 1983-09-27
•
Granted: 1985-06-04
•
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 14:00
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.
References Cited (Backward Citations)
US4108837A
Cited
US4175175A
Cited
US3354129A
Cited
US3580829A
Cited
US3446654A
Cited
US3441538A
Cited
US3658932A
Cited
US3847867A
Cited
US3738923A
Cited
US3838097A
Cited
US3953400A
Cited
US3763222A
Cited
US3840619A
Cited
US3947525A
Cited
US3956240A
Cited
US3956240B1
Cited
US4031167A
Cited
US3911192A
Cited
US3894118A
Cited
US3985716A
Cited
US3995091A
Cited
US3970770A
Cited
US4155823A
Cited
US4121001A
Cited
US4107147A
Cited
US4320224A
Cited
US4176027A
Cited
US4184001A
Cited
US4293670A
Cited
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 |