US4387170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of foamed materials from polyolefins
Assignee: Dynamit Nobel AG
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Filing: 1981-06-15
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Granted: 1983-06-07
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Expires: 2001-06-15
Abstract
Abstract An improved process for the foaming of polyolefin materials is disclosed where the polyolefin is crosslinked by a peroxide and foamed by a chemical foaming agent combined with an auxiliary foaming agent is disclosed. According to the invention, the auxiliary foaming is a sterically hindered phenol and/or an organic phosphorus compound.
Inventors
- 👤 Werner Kuhnel
- 👤 Paul Spielau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:59
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J9/101; C08J9/0014; C08J2323/00; C08J2323/02; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S521/00; Y10S521/909; Y10S521/91
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
63 words
In a process for the production of a foamed material from polyolefin by organic peroxide crosslinking and foaming by means of a chemical foaming agent with a decomposition point or range starting at about 190° C. and an auxiliary foaming agent, the improvement wherein said polyolefin is foamed employing as said auxiliary foaming agent a sterically hindered phenol or an organic phosphorus compound.
Claim 2
Dependent Claim
63 words
In a process for the production of a foamed material from polyolefin by organic peroxide crosslinking and foaming by means of a chemical foaming agent with a decomposition point or range starting at about 190° C. and an auxiliary foaming agent, the improvement wherein said polyolefin is foamed employing as said auxiliary foaming agent a sterically hindered phenol or an organic phosphorus compound.
Claim 3
Dependent Claim
36 words
A process according to claim 1 wherein said auxiliary foaming agent is a sterically hindered phenol and said sterically hindered phenol contains from 1 to 4 phenolically bound OH groups, the phenolic structural units being monohydric.
Claim 4
Dependent Claim
24 words
A process according to claim 1 wherein the auxiliary foaming agent is an organic phosphorus compound and said organic phosphorus compound is a diphosphonite.
Claim 5
Dependent Claim
12 words
A process according to claim 3 wherein said diphosphonite is 4,4'-biphenylene diphosphonite.
Claim 6
Dependent Claim
35 words
A process according to claim 1 wherein said sterically hindered phenol and/or said organic phosphorus compound is employed in an amount ranging from 0.05 to 3 weight percent, based upon the amount of polyolefin employed.
Claim 7
Dependent Claim
19 words
A process according to claim 1 wherein the chemically foaming agent has a decomposition point of about 190° C.
References Cited (Backward Citations)
US3098831A
Cited
US3098832A
Cited
US3278466A
Cited
US3468821A
Cited
US3645929A
Cited
US3966651A
Cited
US4203815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |