Patent US5180754A successfully refreshed from Google Patents.
US5180754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer composition for foam molding
Assignee: Mitsubishi Cable Industries Ltd
•
Filing: 1991-06-11
•
Granted: 1993-01-19
•
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 04:08
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.
References Cited (Backward Citations)
US3072583A
Cited
US3976605A
Cited
US4560829A
Cited
US4716073A
Cited
US4764538A
Cited
US4877815A
Cited
US5023279A
Cited
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 |