Patent US4599391A successfully refreshed from Google Patents.
US4599391A
Expired / Lapsed
US
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Coating composition for power cable
Assignee: Eneos Corp
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Filing: 1984-12-18
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Granted: 1986-07-08
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Expires: 2004-12-18
Abstract
Abstract Provided is a power cable coating composition comprising a copolymer of ethylene or ethylene and an alpha -olefin with 0.02-2 mol % of a cyclic non-conjugated diene, said copolymer being prepared by a high-pressure radical polymerization process, said copolymer having a melt index of 0.2-10 g/10 min and an iodine value in the range of 0.2 to 20, and not more than 2.5 parts by weight, based on 100 parts by weight of said copolymer, of a peroxide, said composition on heat-crosslinking affording a crosslinked product having at least the following properties: (a) a percent heat-deformation at 120 DEG C. not more than 20%, and (b) a maximum peak temperature (Tm) not lower than 100 DEG C. measured according to the differential scanning calorimetry (DSC).
Inventors
- 👤 Kaoru Yamamoto
- 👤 Takashi Inoue
- 👤 Shinji Kojima
- 👤 Sadahiro Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:28
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/083; C08F; C08F210/00; C08F210/16; C08F210/18; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/14; C08L23/06; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; C08F210/02; C08L2312/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
143 words
A power cable coating composition comprising a copolymer of ethylene or ethylene and an α-olefin with 0.02-2 mol % of a cyclic non-conjugated diene, wherein the amount of the α-olefin copolymerized in said copolymer is in the range of 0 to 3 mol % in terms of monomer, said copolymer being prepared by a high-pressure radical polymerization process, said copolymer having a melt index of 0.2-10 g/10 min and iodine value in the range of 0.2 to 20, and not more than 2.5 parts by weight, based on 100 parts by weight of said copolymer, of a peroxide, said composition on heat-crosslinking affording a crosslinked product having at least the following properties: (a) a percent heat-deformation at 120° C. not more than 20%, and (b) a maximum peak temperature (Tm) not lower than 100° C. measured according to the differential scanning calorimetry (DSC).
Claim 2
Dependent Claim
143 words
A power cable coating composition comprising a copolymer of ethylene or ethylene and an α-olefin with 0.02-2 mol % of a cyclic non-conjugated diene, wherein the amount of the α-olefin copolymerized in said copolymer is in the range of 0 to 3 mol % in terms of monomer, said copolymer being prepared by a high-pressure radical polymerization process, said copolymer having a melt index of 0.2-10 g/10 min and iodine value in the range of 0.2 to 20, and not more than 2.5 parts by weight, based on 100 parts by weight of said copolymer, of a peroxide, said composition on heat-crosslinking affording a crosslinked product having at least the following properties: (a) a percent heat-deformation at 120° C. not more than 20%, and (b) a maximum peak temperature (Tm) not lower than 100° C. measured according to the differential scanning calorimetry (DSC).
Claim 3
Dependent Claim
26 words
The power cable coating composition of claim 1, wherein the cyclic non-conjugated diene is selected from the group consisting of vinyl nornornene, ethylidene norbornene and vinylcyclohexene.
Claim 4
Dependent Claim
23 words
The power cable coating composition of claim 1, wherein said composition contains said copolymer in an amount not less than 60 weight percent.
Claim 5
Dependent Claim
21 words
The power cable coating composition of claim 1, wherein said polymer composition further contains an ethylenic polymer blended with said copolymer.
Claim 6
Independent Claim
174 words
A method for forming an insulation coating on a power cable, which method comprises extrusion-coating a composition onto a cable conductor, and then heating the composition to allow crosslinking to take place to thereby convert the composition into a crosslinked product having at least the following properties: (a) a percent heat-deformation at 120° C. not more than 20%, and (b) a maximum peak temperature (Tm) not lower than 100° C. measured according to the differential scanning calorimetry (DSC), said composition comprising a copolymer of ethylene or ethylene and an α-olefin with 0.02-2 mol % of a cyclic non-conjugated diene, wherein the amount of the α-olefin copolymerized in said copolymer is in the range of 0 to 3 mol % in terms of monomer, said copolymer being prepared by a high-pressure radical polymerization process said copolymer having a melt index of 0.2-10 g/10 min and an iodine value in the range of 0.2 to 20, and not more than 2.5 parts by weight, based on 100 parts by weight of said copolymer, of a peroxide.
Claim 7
Independent Claim
174 words
A method for forming an insulation coating on a power cable, which method comprises extrusion-coating a composition onto a cable conductor, and then heating the composition to allow crosslinking to take place to thereby convert the composition into a crosslinked product having at least the following properties: (a) a percent heat-deformation at 120° C. not more than 20%, and (b) a maximum peak temperature (Tm) not lower than 100° C. measured according to the differential scanning calorimetry (DSC), said composition comprising a copolymer of ethylene or ethylene and an α-olefin with 0.02-2 mol % of a cyclic non-conjugated diene, wherein the amount of the α-olefin copolymerized in said copolymer is in the range of 0 to 3 mol % in terms of monomer, said copolymer being prepared by a high-pressure radical polymerization process said copolymer having a melt index of 0.2-10 g/10 min and an iodine value in the range of 0.2 to 20, and not more than 2.5 parts by weight, based on 100 parts by weight of said copolymer, of a peroxide.
Claim 8
Dependent Claim
32 words
The power cable coating composition of claim 1, wherein said copolymer of ethylene or ethylene and an α-olefin with 0.02-2mol % of a cyclic non-conjugated diene has a density of 0.92-0.94 g/cc.
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) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |