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US3933772A
Expired / Lapsed
US
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Dielectric polyolefin compositions
Assignee: Kureha Corp
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Filing: 1974-06-20
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Granted: 1976-01-20
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Expires: 1994-06-20
Abstract
Abstract Polyolefin compositions having excellent dielectric properties comprising an alkylpyrene having the following formula ##SPC1## (wherein R represents an alkyl group containing from 1 to 4 carbon atoms, and x is an integer of from 1 to 4, and when x is an integer of 2 or greater, R may be different or the same) in an amount of at last 0.5 parts by weight per 100 parts by weight of a polyolefin.
Inventors
- 👤 Masaaki Takahashi
- 👤 Akira Ito
- 👤 Yuriko Igarashi
- 👤 Shichiro Kawada
- 👤 Jiro Ogura
- 👤 Ryoichi Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:41
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/01
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
75 words
A dielectric composition comprising a polyolefin and an alkylpyrene of the formula ##SPC4## wherein R represents an alkyl group containing from 1 to 4 carbon atoms and x is an integer of 1 to 4, provided that when x is an integer of 2 or greater, R may be the same or different; said alkylpyrene being present in an amount of at least 0.5 parts by weight per 100 parts by weight of said polyolefin.
Claim 2
Dependent Claim
75 words
A dielectric composition comprising a polyolefin and an alkylpyrene of the formula ##SPC4## wherein R represents an alkyl group containing from 1 to 4 carbon atoms and x is an integer of 1 to 4, provided that when x is an integer of 2 or greater, R may be the same or different; said alkylpyrene being present in an amount of at least 0.5 parts by weight per 100 parts by weight of said polyolefin.
Claim 3
Dependent Claim
28 words
The composition of claim 1, wherein said alkylpyrene is present in an amount of 0.5 to 10 parts by weight per 100 parts by weight of said polyolefin.
Claim 4
Dependent Claim
13 words
The composition of claim 1, wherein said alkylpyrene is a mixture of isomers.
Claim 5
Dependent Claim
13 words
The composition of claim 1, wherein said alkylpyrene is a mixture of alkylpyrenes.
Claim 6
Dependent Claim
21 words
The composition of claim 1, wherein said polyolefin is selected from the group consisting of polyethylene, polypropylene, polybutene, and ethylene-propylene copolymers.
Claim 7
Dependent Claim
24 words
The composition of claim 1, wherein said alkylpyrene is selected from the group consisting of methylpyrene, ethylpyrene, monopropylpyrene, dipropylpyrene, tripropylpyrene, butylpyrene and mixtures thereof.
Claim 8
Dependent Claim
76 words
A dielectric composition comprising an ethylenevinylacetate copolymer and an aklylpyrene of the formula: ##SPC5## wherein R represents an alkyl group containing from 1 to 4 carbon atoms and x is an integer of 1 to 4, provided that when x is an integer of 2 or greater, R may be the same or different; said alkylpyrene being present in an amount of at least 0.5 parts by weight per 100 parts by weight of said polyolefin.
Claim 9
Dependent Claim
76 words
A dielectric composition comprising an ethylenevinylacetate copolymer and an aklylpyrene of the formula: ##SPC5## wherein R represents an alkyl group containing from 1 to 4 carbon atoms and x is an integer of 1 to 4, provided that when x is an integer of 2 or greater, R may be the same or different; said alkylpyrene being present in an amount of at least 0.5 parts by weight per 100 parts by weight of said polyolefin.
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) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |