Patent US3901835A successfully refreshed from Google Patents.
US3901835A
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Process for obtaining a foamed ethylene polymer and product obtained thereby
Assignee: SnamProgetti SpA
•
Filing: 1973-09-10
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Granted: 1975-08-26
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Expires: 1993-09-10
Abstract
Abstract A novel process is disclosed for the preparation of an ethylene polymer foam which is based on the use of a polycyclic polyene modified ethylene polymer, a sulfur based vulcanizing system and a foaming agent.
Inventors
- 👤 Roberto Paiella
- 👤 Giampaolo Giuliani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:30
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08F; C08F8/00; C08J2323/00; C08J2323/02; C08J2323/04; Y; Y10; Y10S; Y10S264/00; Y10S264/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
63 words
A PROCESS FOR THE PRODUCTION OF A FOAMED ETHYLENE POLYMER WHICH COMPRISES: A. FORMING A MIXTURE OF: I. A COPOLYMER OF ETHYLENE AND FROM 0.1 TO 10% BY WEIGHT OF A POLYCYCLIC POLYENE HAVING AT LEAST THREE DOUBLE BONDS IN THE MOLECULE, II. A SULFUR BASED VULCANIZING SYSTEM, AND III. A FOAMING AGENT, B. AND FOAMING SAID MIXTURE TO FORM SAID FOAMED POLYETHYLENE.
Claim 2
Dependent Claim
63 words
A PROCESS FOR THE PRODUCTION OF A FOAMED ETHYLENE POLYMER WHICH COMPRISES: A. FORMING A MIXTURE OF: I. A COPOLYMER OF ETHYLENE AND FROM 0.1 TO 10% BY WEIGHT OF A POLYCYCLIC POLYENE HAVING AT LEAST THREE DOUBLE BONDS IN THE MOLECULE, II. A SULFUR BASED VULCANIZING SYSTEM, AND III. A FOAMING AGENT, B. AND FOAMING SAID MIXTURE TO FORM SAID FOAMED POLYETHYLENE.
Claim 3
Dependent Claim
13 words
A foamed ethylene polymer when obtained according to the process of claim 1.
Claim 4
Dependent Claim
16 words
A process as defined in claim 1 wherein the polycyclic polyene is (4 or 5 methyl)-2-cyclopentadienyl-2''-norborn-5''-enylmethane.
Claim 5
Dependent Claim
53 words
A process as defined in claim 1 wherein step (b) is carried out so that said foamed ethylene polymer has a uniform cellular structure, a density ranging between 0.03 to 0.15 g/cm3, at least 85% of the pores are not larger than 1 mm and a gel content ranging from 5 to 80%.
Claim 6
Dependent Claim
24 words
A process as defined in claim 1 wherein the foaming agent is employed at from 1 to 15 parts per 100 parts of copolymer.
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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |