US4493788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamable electroconductive polyolefin resin compositions
Assignee: Dow Chemical Co
•
Filing: 1982-08-10
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Granted: 1985-01-15
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Expires: 2002-08-10
Abstract
Abstract A foamable, electroconductive polyolefinic resin composition comprising 70 to 95 weight percent of a polyolefinic resin and 5 to 30 weight percent of an electrically-conductive particulate furnace black having a specific surface area of at least 900 square meters per gram. Foam products prepared from this composition, preferably by extrusion foaming, are particularly useful for packaging sensitive electronic parts.
Inventors
- 👤 Akira Fujie
- 👤 Minoru Hisamatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:54
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
43 words
An electroconductive polyolefin resin foam containing 70 to 95 percent by weight of a polyolefinic resin and 5 to 30 percent by weight of an electrically-conductive, hollow particulate furnace black having a specific surface area of at least 900 square meters per gram.
Claim 2
Dependent Claim
43 words
An electroconductive polyolefin resin foam containing 70 to 95 percent by weight of a polyolefinic resin and 5 to 30 percent by weight of an electrically-conductive, hollow particulate furnace black having a specific surface area of at least 900 square meters per gram.
Claim 3
Dependent Claim
19 words
The electroconductive resin foam of claim 1 wherein the polyolefin resin is a polyethylene or ethylene-vinyl acetate copolymer resin.
Claim 4
Dependent Claim
28 words
The electroconductive resin foam of claim 1 wherein the polyolefin resin is polyethylene with a melt index of 1 to 30 and a density of 0.910 to 0.930.
Claim 5
Dependent Claim
17 words
The electroconductive resin foam of claim 1 prepared by extrusion foaming with a volatile organic blowing agent.
Claim 6
Dependent Claim
23 words
The electroconductive resin foam of claim 1 wherein the volatile organic blowing agent is a C 1 -C 2 fluorocarbon or mixture thereof.
References Cited (Backward Citations)
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Cited
US4231901A
Cited
US4301040A
Cited
US4287117A
Cited
US4229396A
Cited
US4317888A
Cited
US4431575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-15 | 1988-07-16 | 1989-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-15 | 1992-07-16 | 1993-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-15 | 1996-07-16 | 1997-01-15 | $7700.00 | Window Closed / Lapsed |