Patent US4767668A successfully refreshed from Google Patents.
US4767668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric wire and cable
Assignee: Tyco Electronics UK Ltd
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Filing: 1985-11-15
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Granted: 1988-08-30
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Expires: 2005-11-15
Abstract
Abstract PCT No. PCT/GB85/00517 Sec. 371 Date Jul. 10, 1986 Sec. 102(e) Date Jul. 10, 1986 PCT Filed Nov. 15, 1985 PCT Pub. No. WO86/03049 PCT Pub. Date May 22, 1986.Electrical wire and cable is provided with a layer of insulation or jacketing material which comprises a mixture of: (1) a polyester based on tetramethylene terephthalate, preferably polytetramethylene terephthalate; and (2) more than 40%, based on polymer (1), of a block copolymer preferably having polytetramethylene terephthalate hard blocks and poly(polytetramethylene oxide terephthalate) soft blocks. Polymer (2) has a flex modulus of at least 69 MPa preferably at least 138 MPa. The insulation or jacketing material exhibits improved resistance to stress crazing in a number of solvents.
Inventors
- 👤 Timothy S. Smith
- 👤 David W. M. Thornley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:29
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; H01B3/421; C; C08; C08L; C08L67/00; C08L67/02; C08L67/025; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
121 words
An article of manufacture comprising an electrical wire or cable having a layer of insulating or jacketing material which comprises an intimate mixture of: (1) a polyester in which at least 70 mole % of the repeating units are tetramethylene terephthalate units; and (2) from more than 40% to 100% by weight, based on the weight of the polyester (1), of a block copolymer in which one of the blocks is composed of repeating units which have the formula ##STR4## in which p is an integer of at least 2 and Ar represents an unsubstituted or substituted aryl group, and the other of the blocks comprises a polyalkylene ether; the block copolymer having a flex modulus of at least 172 MPa.
Claim 2
Dependent Claim
121 words
An article of manufacture comprising an electrical wire or cable having a layer of insulating or jacketing material which comprises an intimate mixture of: (1) a polyester in which at least 70 mole % of the repeating units are tetramethylene terephthalate units; and (2) from more than 40% to 100% by weight, based on the weight of the polyester (1), of a block copolymer in which one of the blocks is composed of repeating units which have the formula ##STR4## in which p is an integer of at least 2 and Ar represents an unsubstituted or substituted aryl group, and the other of the blocks comprises a polyalkylene ether; the block copolymer having a flex modulus of at least 172 MPa.
Claim 3
Dependent Claim
27 words
An article as claimed in claim 1, wherein the insulating or jacketing material comprises more than 50% of polymer (2) based on the weight of polymer (1).
Claim 4
Dependent Claim
13 words
An article as claimed in claim 1, wherein polymer (1) is polytetramethylene terephthalate.
Claim 5
Dependent Claim
19 words
An article as claimed in claim 1, wherein polymer (2) has a flex modulus of less than 689 MPa.
Claim 6
Dependent Claim
56 words
An article as claimed in claim 1, wherein polymer (2) comprises a segmented polyether ester copolymer in which one of the blocks is composed of units of the formula ##STR5## and the other of the blocks is composed of units of the general formula ##STR6## in which n is an integer of from 6 to 40.
Claim 7
Dependent Claim
17 words
An article as claimed in claim 1, wherein the insulating or jacketing material includes a flame retardant.
Claim 8
Dependent Claim
26 words
An article as claimed in claim 6, wherein the flame retardant is present in an amount of at least 50% of the weight of polymer (2).
Claim 9
Dependent Claim
33 words
An article as claimed in claim 6, wherein the flame retardant is present in an amount in the range of from 5 to 30% by weight based on the weight of the mixture.
Claim 10
Dependent Claim
18 words
An article as claimed in claim 6, wherein the flame retardant comprises a bromine containing organic flame retardant.
Claim 11
Dependent Claim
16 words
An article as claimed in claim 6, wherein the insulating or jacketing material includes antimony trioxide.
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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) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |