US5180754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer composition for foam molding
Assignee: Mitsubishi Cable Industries Ltd
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Filing: 1991-06-11
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Granted: 1993-01-19
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Expires: 2011-06-11
Abstract
Abstract Polymer compositions for molding in the presence of a foaming agent which comprise at least a polyolefin resin as a base resin and low polarity boron compound powder which is not decomposed at a foaming temperature, such as boron nitride powder as a nucleator. Polymer compositions of the invention are useful for formation of a foamed insulating layer on a conductive material by way of foam molding. By using said polymer composition, a foamed insulating layer excellent in insulation properties which has small dielectric loss factor, tan δ, at high frequency and high extent of foaming of not less than 70% can be obtained.
Inventors
- 👤 Yukio Morita
- 👤 Toshihiro Zushi
- 👤 Nobuyoshi Matsuda
- 👤 Kaneharu Suga
- 👤 Takuma Takai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:18
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C08J2323/00; C08J2323/02; Y; Y10; Y10S; Y10S521/00; Y10S521/908
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
43 words
A foamable electrical insulator composition consisting essentially at least a propylene-ethylene copolymer containing 0.5-20 weight % ethylene component as a base resin, a foaming agent and a low polarity boron compound powder which is not decomposed at a foaming temperature as a nucleator.
Claim 2
Dependent Claim
43 words
A foamable electrical insulator composition consisting essentially at least a propylene-ethylene copolymer containing 0.5-20 weight % ethylene component as a base resin, a foaming agent and a low polarity boron compound powder which is not decomposed at a foaming temperature as a nucleator.
Claim 3
Dependent Claim
16 words
A foamable electrical insulator composition according to claim 1, wherein the nucleator is boron nitride powder.
Claim 4
Dependent Claim
21 words
A foamable electrical insulator composition according to claim 1, wherein particle diameter of the nucleator is not more than 100 μm.
Claim 5
Dependent Claim
19 words
A foamable electrical insulator composition according to claim 1, wherein purity of the nucleator is not less than 95%.
Claim 6
Dependent Claim
20 words
A foamable electrical insulator composition according to claim 1, wherein water content of the nucleator is not more than 0.8%.
Claim 7
Dependent Claim
32 words
A foamable electrical insulator composition according to claim 1, wherein the propylene-ethylene copolymer containing 0.5-20 weight % of ethylene component has a flexural modulus of not less than 50 kg/mm 2 .
Claim 8
Dependent Claim
32 words
A foamable electrical insulator composition according to claim 1, wherein the propylene-ethylene copolymer containing 0.5-20 weight % of ethylene component has an Izod impact strength of not less than 3.0 kg. cm/cm.
Claim 9
Dependent Claim
32 words
A foamable electrical insulator composition according to claim 1, wherein the propylene-ethylene copolymer containing 0.5-20 weight % of ethylene component has a melt flow rate of not less than 1.0 g/10 min.
Claim 10
Dependent Claim
15 words
A foamable electrical insulator composition according to claim 1, wherein the foaming agent is (monochlorodifluoroethane).
Claim 11
Dependent Claim
39 words
An insulator for a coaxial cable prepared from a composition consisting essentially of propylene-ethylene copolymer as a base resin, a foaming agent and a nucleator of low polarity boron compound powder which does not decompose at a foaming temperature.
Claim 12
Dependent Claim
39 words
An insulator for a coaxial cable prepared from a composition consisting essentially of propylene-ethylene copolymer as a base resin, a foaming agent and a nucleator of low polarity boron compound powder which does not decompose at a foaming temperature.
Claim 13
Dependent Claim
17 words
An insulator for a coaxial cable according to claim 10, wherein the nucleator is boron nitride powder.
Claim 14
Dependent Claim
22 words
An insulator for a coaxial cable according to claim 10, wherein particle diameter of the nucleator is not more than 100 μm.
Claim 15
Dependent Claim
20 words
An insulator for a coaxial cable according to claim 10, wherein purity of the nucleator is not less than 95%.
Claim 16
Dependent Claim
22 words
An insulator for a coaxial cable according to claim 10, wherein the the propylene-ethylene copolymer contains 0.5-20 weight % of ethylene component.
Claim 17
Dependent Claim
26 words
An insulator for a coaxial cable according to claim 14, wherein said propylene-ethylene copolymer has a flexural modulus of not less than 50 kg/mm 2 .
Claim 18
Dependent Claim
26 words
An insulator for a coaxial cable according to claim 14, wherein said propylene-ethylene copolymer has an Izod impact strength of not less than 3.0 kg. cm/cm.
Claim 19
Dependent Claim
26 words
An insulator for a coaxial cable according to claim 14, wherein said propylene-ethylene copolymer has a melt flow rate of not less than 1.0 g/10 min.
Claim 20
Dependent Claim
19 words
The foamable insulator composition according to claim 1, wherein the propylene-ethylene copolymer contains 1-10 weight % of ethylene component.
Claim 21
Dependent Claim
21 words
The insulator for a coaxial cable according to claim 12, wherein the propylene-ethylene copolymer contains 1-10 weight % of ethylene component.
Claim 22
Dependent Claim
16 words
An insulator for a coaxial cable according to claim 10, wherein the foaming agent is monochlorodifluoroethane.
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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) | 1996-01-19 | 1996-07-20 | 1997-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-01-19 | 2000-07-20 | 2001-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-01-19 | 2004-07-20 | 2005-01-19 | $7700.00 | Window Closed / Lapsed |