US4778866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethylene copolymer
Assignee: Mitsubishi Chemical Corp
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Filing: 1986-07-07
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Granted: 1988-10-18
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Expires: 2006-07-07
Abstract
Abstract An ethylene copolymer comprising an ethylene unit and an ester unit selected from ethylenically alpha , beta -unsaturated acid esters represented by the formula (I) or (II): <IMAGE> (I) wherein R1 represents a hydrogen atom or a methyl group; and R2 represents a halogenated alkyl group having from 1 to 15 carbon atoms; <IMAGE> (II) wherein R3 represents a hydrogen atom or a methyl group; and n represents 0 or 1, wherein said ester unit is present in a total amount of from 0.001 to 10 mol %. The copolymer has excellent dielectric breakdown characteristics, such as electricity treeing property, water treeing property, etc., and is useful as an insulating material for high-voltage cables.
Inventors
- 👤 Takeo Shimada
- 👤 Iwao Ishino
- 👤 Noriyuki Okada
- 👤 Tsutomu Isaka
- 👤 Akiyoshi Oonishi
- 👤 Masaki Saito
- 👤 Shuhei Doi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:20
CPC Classifications
C; C08; C08F; C08F255/00; C08F255/02; C08F210/00; C08F210/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
63 words
An ethylene copolymer for use as electrical insulation comprised of ethylene monomer and an ethylenically α,β-unsaturated ester monomer of the formula: ##STR5## wherein R 1 is hydrogen or methyl and R 2 is a fluorinated alkyl group having from 1 to 15 carbon atoms, said ester monomer unit being present in the copolymer in an amount of from 0.1 to 1.6% by weight.
Claim 2
Dependent Claim
63 words
An ethylene copolymer for use as electrical insulation comprised of ethylene monomer and an ethylenically α,β-unsaturated ester monomer of the formula: ##STR5## wherein R 1 is hydrogen or methyl and R 2 is a fluorinated alkyl group having from 1 to 15 carbon atoms, said ester monomer unit being present in the copolymer in an amount of from 0.1 to 1.6% by weight.
Claim 3
Dependent Claim
40 words
The ethylene copolymer of claim 1, wherein said copolymer has a density ranging from 0.88 to 1.00 g/cm 2 , a degree of crystallinity of from 25 to 70% and a number average molecular weight ranging from 1,000 to 100,000.
Claim 4
Dependent Claim
32 words
The ethylene copolymer of claim 1, wherein said copolymer further contains a monomer unit selected from the group consisting of vinyl esters, alkyl acrylic esters, alkyl methacrylic esters and ethylenically α,β-unsaturated acids.
Claim 5
Dependent Claim
24 words
The ethylene copolymer of claim 1, wherein said fluorinated alkyl group is trifluoroethyl, difluoromethyl, monofluoroethyl, monofluoromethyl, trifluoromethyl, tetrafluoroethyl, pentafluoroethyl, pentafluoropentadecanyl, heptafluorodecanyl, heptadecylfluorodecanyl or hexafluorononyl.
References Cited (Backward Citations)
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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) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |