US4542164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame-retardant polyolefin foam
Assignee: Toray Industries Inc
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Filing: 1983-10-04
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Granted: 1985-09-17
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Expires: 2003-10-04
Abstract
Abstract The present invention relates to a flame-retardant polyolefin foam comprising a polyolefinic thermoplastic resin consisting mainly of a homopolymer of α-olefin or copolymer of α-olefins having 2 to 10 carbon atoms; 2 to 10 percent by weight as bromine content, based on the weight of the foam, of a bisphenol A-based brominated epoxy resin or a crosslinked product thereof; and 0 to 25 percent by weight, based on the weight of the foam, of an inorganic filler. The foam of the present invention has superior flame retardancy and thermoformability in addition to the superior heat insulating property and shock absorbing property of the polyolefin foam, and because of these superior characteristics it is useful as an automotive interior material, etc.
Inventors
- 👤 Takeshi Nishioka
- 👤 Akira Nakamura
- 👤 Kenji Yabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:06
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08L; C08L23/00; C08L23/02; C08J2323/00; C08J2323/02; C08J2463/00; Y; Y10; Y10S; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
96 words
A flame-retardant polyolefin foam comprising at least a polyolefinic thermoplastic resin selected from the group consisting mainly of a homopolymer of α-olefin having 2 to 10 carbon atoms and copolymer of α-olefins having 2 to 10 carbon atoms; 2 to 10 percent by weight as bromine content, based on the weight of the foam, of at least a flame retardant selected from the group consisting mainly of a bisphenol A-based brominated epoxy resin and a crosslinked product thereof; and 0 to 25 percent by weight, based on the weight of the foam, of an inorganic filler.
Claim 2
Dependent Claim
96 words
A flame-retardant polyolefin foam comprising at least a polyolefinic thermoplastic resin selected from the group consisting mainly of a homopolymer of α-olefin having 2 to 10 carbon atoms and copolymer of α-olefins having 2 to 10 carbon atoms; 2 to 10 percent by weight as bromine content, based on the weight of the foam, of at least a flame retardant selected from the group consisting mainly of a bisphenol A-based brominated epoxy resin and a crosslinked product thereof; and 0 to 25 percent by weight, based on the weight of the foam, of an inorganic filler.
Claim 3
Dependent Claim
50 words
A flame-retardant polyolefin foam according to claim 1, wherein said polyolefinic thermoplastic resin comprises a blend of 70-40 percent by weight of a low density polyethylene and 30-60 percen by weight of an ethylene/C 3 -C 10 α-olefin copolymer having an ethylene content of 88 to 97 percent by weight.
Claim 4
Dependent Claim
61 words
A flame-retardant polyolefin foam according to claim 1, wherein said polyolefinic thermoplastic resin comprises a blend of 90-30 percent by weight of a random propylene/ethylene copolymer having an ethylene content of 1 to 15 percent by weight and 10-70 percent by weight of an ethylene/C 3 -C 10 α-olefin copolymer having an ethylene content of 88 to 97 percent by weight.
Claim 5
Dependent Claim
33 words
A flame-retardant polyolefin foam according to claim 1, wherein said flame retardant is a resin selected from the group consisting mainly of a diglycidyl ether of tetrabromobisphenol A and a crosslinked product thereof.
Claim 6
Dependent Claim
41 words
A flame-retardant polyolefin foam according to claim 4, wherein said diglycidyl ether of tetrabromobisphenol A has a bromine content of 16 to 52 percent by weight, an epoxy equivalent of 200 to 2000 and a molecular weight of 400 to 4000.
Claim 7
Dependent Claim
33 words
A flame-retardant polyolefin foam according to claim 1, wherein the content of said inorganic filler is in the range of 0 to 10 percent by weight based on the weight of the foam.
Claim 8
Dependent Claim
15 words
A flame-retardant polyolefin foam according to claim 1, wherein said inorganic filler is antimony trioxide.
Claim 9
Dependent Claim
17 words
A flame-retardant polyolefin foam according to claim 1, wherein said inorganic filler is a hydrated metal oxide.
Claim 10
Dependent Claim
31 words
A flame-retardant polyolefin foam according to claim 1, the foam is one having a gel content of 10 to 60 percent by weight and an expansion ratio of 10 to 100.
Claim 11
Dependent Claim
32 words
A flame-retardant polyolefin foam according to claim 1, wherein said polyolefinic thermoplastic resin comprises an ethylene/C 3 -C 10 α-olefin copolymer having an ethylene content of 88 to 97 percent by weight.
Claim 12
Dependent Claim
46 words
A flame-retardant polyolefin foam according to claim 1, wherein said polyolefinic thermoplastic resin comprises a crystalline propylene/ethylene random copolymer having an ethylene content of 1 to 15 percent by weight, a random factor (k) not larger than 0.7 and an isotacticity (I.I.) not less than 40%.
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) | 1988-09-16 | 1989-03-18 | 1989-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-16 | 1993-03-18 | 1993-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-16 | 1997-03-18 | 1997-09-17 | $7700.00 | Window Closed / Lapsed |