Patent US4284743A successfully refreshed from Google Patents.
US4284743A
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Process for the cross-linking of high density polyethylene with diene units in solid state
Assignee: Anic SpA
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Filing: 1979-12-17
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Granted: 1981-08-18
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Expires: 1999-12-17
Abstract
Abstract A process for the cross-linking of high density polyethylene in the solid state according to which the polyethylene is admixed with the agents normally used for the vulcanization of unsaturated rubber compounds, then processed into the desired article and thereafter cross-linked at a temperature lower than the melting point of the polyethylene, the process being carried out in polyethylene containing a certain number of unsaturated bonds along the polymer chain.
Inventors
- 👤 Gian P. Giuliani
- 👤 Roberto Paiella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:41
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/24; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
72 words
A process for cross-linking high density polyethylene containing diene unsaturation in the amount of 0.1 to 100 double bonds per 1000 carbon atoms which comprises meltmixing said high density polyethylene with a sulfur based vulcanizing system and at a temperature of from 150°-180° C. for a period of time that avoids any premature cross-linking and thereafter heating said polyethylene at a temperature of from 100°-130° C. to obtain high density cross-linked polyethylene.
Claim 2
Dependent Claim
72 words
A process for cross-linking high density polyethylene containing diene unsaturation in the amount of 0.1 to 100 double bonds per 1000 carbon atoms which comprises meltmixing said high density polyethylene with a sulfur based vulcanizing system and at a temperature of from 150°-180° C. for a period of time that avoids any premature cross-linking and thereafter heating said polyethylene at a temperature of from 100°-130° C. to obtain high density cross-linked polyethylene.
Claim 3
Dependent Claim
50 words
A process as defined in claim 1 wherein the polyethylene contain 1.5 mole percent of butadiene and the sulfur based vulcanizing system contains 1.0 g of 2,2'-methylenebis (4-methyl-6-tert-butylphenol); 5.0 g of zinc oxide; 1.0 g of stearic acid; 1.5 g N-oxydiethylbenzothiazole-2-sulfenamide; 0.5 g dibenzothiozyl disulfide and 3.0 g of sulfur.
References Cited (Backward Citations)
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US3901862A
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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) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |