US4454256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dielectrically heatable polyolefin foams
Assignee: Bayer AG
•
Filing: 1983-04-29
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Granted: 1984-06-12
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Expires: 2003-04-29
Abstract
Abstract Dielectrically heatable polyolefin foams which contain from 3 to 20% by weight of an unsaturated polyester being optionally fully hardened.
Inventors
- 👤 Bruno Pellicelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:31
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; B; B29; B29C; B29C35/00; B29C35/02; B29C35/12; C08J2323/00; C08J2323/02; C08J2467/00; Y; Y10; Y10S; Y10S264/00; Y10S264/18; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T442/00; Y10T442/30; Y10T442/3325
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
72 words
Dielectrically heatable, polyolefin foamed mouldings consisting essentially of from 3 to 20% by weight, based on the foam, of an unsaturated polyester obtained by a process which comprises mixing polyolefin and 3 to 20% by weight, based on the foam to be formed, of an unsaturated polyester with a foaming agent and a crosslinking agent, extruding the mixture to a moulding, and then crosslinking and foaming the moulding by heating the moulding.
Claim 2
Dependent Claim
72 words
Dielectrically heatable, polyolefin foamed mouldings consisting essentially of from 3 to 20% by weight, based on the foam, of an unsaturated polyester obtained by a process which comprises mixing polyolefin and 3 to 20% by weight, based on the foam to be formed, of an unsaturated polyester with a foaming agent and a crosslinking agent, extruding the mixture to a moulding, and then crosslinking and foaming the moulding by heating the moulding.
Claim 3
Dependent Claim
18 words
Foamed mouldings as claimed in claim 1, containing from 5 to 10% by weight of an unsaturated polyester.
Claim 4
Dependent Claim
12 words
Foamed mouldings as claimed in claim 1, wherein the polyester fully hardened.
Claim 5
Dependent Claim
25 words
Foamed mouldings as claimed in claim 1, wherein the polyolefin is polyethylene or a mixture of polyethylene and at maximum 30% by weight chlorinated polyethylene.
Claim 6
Dependent Claim
62 words
The process for producing dielectrically heatable, polyolefin foamed mouldings which comprises mixing a polymeric blend consisting essentially of a polyolefin and 3 to 20% by weight, based on the foam to be formed, of an unsaturated polyester with a foaming agent and a crosslinking agent, extruding the mixture to a moulding, and then crosslinking and foaming the moulding by heating the moulding.
Claim 7
Dependent Claim
62 words
The process for producing dielectrically heatable, polyolefin foamed mouldings which comprises mixing a polymeric blend consisting essentially of a polyolefin and 3 to 20% by weight, based on the foam to be formed, of an unsaturated polyester with a foaming agent and a crosslinking agent, extruding the mixture to a moulding, and then crosslinking and foaming the moulding by heating the moulding.
Claim 8
Dependent Claim
20 words
The process according to claim 5 wherein the polyester is mixed in the amount of 5 to 10% by weight.
Claim 9
Dependent Claim
12 words
The process according to claim 5 wherein the polyester is fully hardened.
Claim 10
Dependent Claim
25 words
The process according to claim 5 wherein the polyolefin is polyethylene or a mixture of polyethylene with up to 30% by weight of chlorinated polyethylene.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |