Patent US4027080A successfully refreshed from Google Patents.
US4027080A
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Crosslinking of polyolefines
Assignee: United Initiators GmbH and Co KG
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Filing: 1976-09-22
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Granted: 1977-05-31
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Expires: 1996-09-22
Abstract
Abstract Polyolefines are crosslinked in the presence of a crosslinking agent having the formula ##STR1## wherein each R is selected from the group consisting of hydrogen, an alkyl group having from 1 to 6 C-atoms and an alkoxy group having 1 or 2 C-atoms, and R 1 , R 2 , R 3 and R 4 each is selected from the group consisting of hydrogen and an alkyl group having from 1 to 6 C-atoms, at least two of R 1 , R 2 , R 3 and R 4 being an alkyl group, and n is an integer from 1 to 5.
Inventors
- 👤 Rudolf Amtmann
- 👤 Hans Seidl
- 👤 Hansjoachim Twittenhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:18
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/01; C08K5/04; C08K5/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
105 words
A method of crosslinking a polyolefine in the presence of a crosslinking agent having the formula ##STR3## wherein each R is selected from the group consisting of hydrogen, an alkyl group having from 1 to 6 C-atoms and an alkoxy group having 1 or 2 C-atoms, and R 1 , R 2 , R 3 and R 4 each is selected from the group consisting of hydrogen and an alkyl group having from 1 to 6 C-atoms, at least two of R 1 , R 2 , R 3 and R 4 being an alkyl group, and n is an integer from 1 to 5.
Claim 2
Independent Claim
105 words
A method of crosslinking a polyolefine in the presence of a crosslinking agent having the formula ##STR3## wherein each R is selected from the group consisting of hydrogen, an alkyl group having from 1 to 6 C-atoms and an alkoxy group having 1 or 2 C-atoms, and R 1 , R 2 , R 3 and R 4 each is selected from the group consisting of hydrogen and an alkyl group having from 1 to 6 C-atoms, at least two of R 1 , R 2 , R 3 and R 4 being an alkyl group, and n is an integer from 1 to 5.
Claim 3
Dependent Claim
21 words
The method of claim 1, wherein R 1 , R 2 , R 3 , and R 4 are alkyl groups.
Claim 4
Dependent Claim
14 words
The method of claim 2, wherein the alkyl groups are methyl or ethyl groups.
Claim 5
Dependent Claim
10 words
The method of claim 1, wherein the polyolefine is polyethylene.
Claim 6
Dependent Claim
15 words
The method of claim 1, wherein the polyolefine is a copolymer of ethylene and propylene.
Claim 7
Dependent Claim
18 words
The method of claim 1, wherein the polyolefine is cross-linked at a temperature from 170° to 400° C.
Claim 8
Dependent Claim
27 words
The method of claim 1, wherein the polyolefine is crosslinked in the presence of 0.1 to 5%, by weight, based on the polyolefine, of the crosslinking agent.
Claim 9
Dependent Claim
51 words
A method as set forth in claim 6, wherein said polyolefine is intimately mixed prior to said crosslinking with said crosslinking agent at a temperature above the softening point of said polyolefine, but not exceeding 190° C., said polyolefine consisting essentially of repeating units having not more than four carbon atoms.
Claim 10
Dependent Claim
58 words
A method as set forth in claim 8, wherein the intimately mixed polyolefine and crosslinking agent are held at said 170° to 400° C. for a period of ten hours to six minutes, the amount of said cross linking agent and said period being sufficient to cause a significant increase in the resistance of said mixture to kneading.
Claim 11
Dependent Claim
42 words
A method as set forth in claim 8, wherein the amount of said cross linking agent is sufficient to cause a significant increase in the resistance of said mixture to kneading within 30 minutes at 280° C., n being one or two.
References Cited (Backward Citations)
GB1118597A
Cited
US3651011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |