US4060659A
Expired / Lapsed
US
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Electric wires or cables with styrene containing dielectric layer
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1975-11-07
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Granted: 1977-11-29
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Expires: 1995-11-07
Abstract
Abstract Electric wires or cables having a dielectric layer or layers of an uncross-linked or cross-linked mixture of (1) a polyolefin and (2a) polystyrene or (2b) a styrene copolymer. The polystyrene is present in such an amount as to provide a 10 to 30% styrene content, based on the entire mixture weight, while if the styrene copolymer is used it is present in such an amount as to provide a 3 to 30% styrene content, based on the entire mixture weight. The mixture may comprise, alternatively, both polystyrene and a styrene copolymer in an amount so as to provide a 10 to 30% and a 5 to 20% styrene content, due to the former and the later, respectively, based on the entire mixture weight.
Inventors
- 👤 Hironaga Matsubara
- 👤 Shousuke Yamanouchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:08
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; H01B3/442; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/296
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
124 words
Electric cables or wires having at least one dielectric layer consisting essentially of (1) of polyolefin and 2a. polystyrene, wherein for polymer composition (1)-(2a) the polystyrene is present in such an amount as to provide a 10 to 30% styrene content; 2b. a styrene copolymer, wherein for polymer composition (1)-(2b) the styrene copolymer is present in such an amount as to provide a 3 to 30% styrene content; or 2c. polystyrene and a styrene copolymer, wherein for polymer composition (1)-(2c) the polystyrene is present so as to provide a 10 to 30% styrene content and the styrene copolymer is present in such an amount so as to provide a 5 to 20% styrene content; all percentages being based on the entire polymer composition weight.
Claim 2
Dependent Claim
124 words
Electric cables or wires having at least one dielectric layer consisting essentially of (1) of polyolefin and 2a. polystyrene, wherein for polymer composition (1)-(2a) the polystyrene is present in such an amount as to provide a 10 to 30% styrene content; 2b. a styrene copolymer, wherein for polymer composition (1)-(2b) the styrene copolymer is present in such an amount as to provide a 3 to 30% styrene content; or 2c. polystyrene and a styrene copolymer, wherein for polymer composition (1)-(2c) the polystyrene is present so as to provide a 10 to 30% styrene content and the styrene copolymer is present in such an amount so as to provide a 5 to 20% styrene content; all percentages being based on the entire polymer composition weight.
Claim 3
Dependent Claim
14 words
Electric cables or wires as claimed in claim 1, wherein said mixture is cross-linked.
Claim 4
Dependent Claim
27 words
Electric cables or wire as claimed in claim 2, wherein the degree of cross-linking is represented by a degree of gellation of about 70 to about 95%.
Claim 5
Dependent Claim
15 words
Electric cables or wires as claimed in claim 1, wherein said mixture is not cross-linked.
Claim 6
Dependent Claim
26 words
Electric cables or wires as claimed in claim 1, wherein said polyolefin is a polyethylene homopolymer of a density of 0.92 and melt index of 1.0.
Claim 7
Dependent Claim
30 words
Electric cables or wires as claimed in claim 1, wherein said polyolefin is an ethylene-vinyl acetate copolymer of a density of 0.93 and a vinyl acetate content of 5 wt.%.
Claim 8
Dependent Claim
23 words
Electric cables or wires as claimed in claim 1, wherein said styrene copolymer is a styrene-butadiene copolymer containing 20 to 80 wt.% styrene.
Claim 9
Dependent Claim
23 words
Electric cables or wires as claimed in claim 1, wherein said at least one dielectric layer consists essentially of said polymer composition (1)-(2a).
Claim 10
Dependent Claim
23 words
Electric cables or wires as claimed in claim 1, wherein said at least one dielectric layer consists essentially of said polymer composition (1)-(2b).
Claim 11
Dependent Claim
61 words
Electric cables or wires having at least one dielectric layer consisting essentially of a polyolefin, polystyrene and a styrene copolymer, the polystyrene and styrene copolymer being present in such amounts as to provide a 10 to 30% styrene contents from the polystyrene and a 5 to 20% styrene content from the styrene copolymer, respectively, based on the entire polymer mixture weight.
Claim 12
Dependent Claim
61 words
Electric cables or wires having at least one dielectric layer consisting essentially of a polyolefin, polystyrene and a styrene copolymer, the polystyrene and styrene copolymer being present in such amounts as to provide a 10 to 30% styrene contents from the polystyrene and a 5 to 20% styrene content from the styrene copolymer, respectively, based on the entire polymer mixture weight.
Claim 13
Dependent Claim
14 words
Electric cables or wires as claimed in claim 10, wherein said mixture is cross-linked.
Claim 14
Dependent Claim
27 words
Electric cables or wires as claimed in claim 11, wherein the degree of cross-linking is represented by a degree of gellation of about 70 to about 95%.
Claim 15
Dependent Claim
15 words
Electric cables or wires as claimed in claim 10, wherein said mixture is not cross-linked.
Claim 16
Dependent Claim
27 words
Electric cables or wires as claimed in claim 10, wherein said polyolefin is a polyethylene homopolymer of a density of 0.92 and a melt index of 1.0.
Claim 17
Dependent Claim
30 words
Electric cables or wires as claimed in claim 10, wherein said polyolefin is an ethylene-vinyl acetate copolymer of a density of 0.93 and a vinyl acetate content of 5 wt.%.
Claim 18
Dependent Claim
23 words
Electric cables or wires as claimed in claim 10, wherein said styrene copolymer is a styrene-butadiene copolymer containing 20 to 80 wt.% styrene.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-28 | 1981-05-30 | 1981-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-28 | 1985-05-30 | 1985-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-28 | 1989-05-30 | 1989-11-29 | $7700.00 | Window Closed / Lapsed |