Patent US4424293A successfully refreshed from Google Patents.
US4424293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crosslinkable polypropylene composition
Assignee: Furukawa Electric Co Ltd
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Filing: 1981-12-28
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Granted: 1984-01-03
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Expires: 2001-12-28
Abstract
Abstract In producing a crosslinked polypropylene foam, 0.5 to 4 parts by weight of a compound selected from triacrylate and trimethacrylate of aliphatic polyhydric alcohol and a blowing agent are mixed with 100 parts by weight of propylene homopolymer or copolymer. Then, the mixture is shaped under heat, followed by irradiation with an ionizing radiation such that the dose of the radiation absorbed by the shaped mass ranges between 0.1 and 10 Mrad. Finally, the irradiated mass is heated for foaming.
Inventors
- 👤 Akio Nojiri
- 👤 Takashi Sawasaki
- 👤 Toshio Koreeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:09
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0028; B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/505; B29C44/56; C08J9/0023; C08J2323/00; C08J2323/02; C08J2323/10; Y; Y10; Y10S; Y10S264/00; Y10S264/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
60 words
A polypropylene composition which can be crosslinked upon irradiation with radiation, comprising component (a) 100 parts by weight of propylene homopolymer or copolymer, and cross-linking components (b) 0.5 to 4 parts by weight of triacrylate or trimethacrylate of aliphatic polyhydric alcohol, and (c) 0.01 to 5 parts by weight of a a phenolic compound containing at least two hydroxyl groups.
Claim 2
Dependent Claim
60 words
A polypropylene composition which can be crosslinked upon irradiation with radiation, comprising component (a) 100 parts by weight of propylene homopolymer or copolymer, and cross-linking components (b) 0.5 to 4 parts by weight of triacrylate or trimethacrylate of aliphatic polyhydric alcohol, and (c) 0.01 to 5 parts by weight of a a phenolic compound containing at least two hydroxyl groups.
Claim 3
Dependent Claim
26 words
The cmposition according to claim 1, which further contains 0.05 to 1 part by weight of a phenolic compound derivative having at least 3 hydroxyl groups.
Claim 4
Dependent Claim
30 words
The composition according to claim 1, wherein the amount of the component (b) selected from triacrylate and trimethacrylate of aliphatic polyhydric alcohol ranges between 1.0 and 2.5 parts by weight.
Claim 5
Dependent Claim
15 words
The composition according to claim or 3, wherein said component (b) is trimethylol propane triacrylate.
Claim 6
Dependent Claim
16 words
The composition according to claim 1 or 3, wherein said component (b) is trimethylol propane trimethacrylate.
Claim 7
Dependent Claim
25 words
The composition according to claim 4, which further contains 0.05 to 1 part by weight of a phenolic compound having at least 3 hydroxyl groups.
Claim 8
Dependent Claim
25 words
The composition according to claim 5, which further contains 0.05 to 1 part by weight of a phenolic compound having at least 3 hydroxyl groups.
Claim 9
Dependent Claim
12 words
The composition according to claim 1 which has been irradiated and crosslinked.
Claim 10
Dependent Claim
45 words
The composition according to claim 1, wherein said phenolic compound is selected from the group consisting of 2,6-di-t-butyl-4-methyl phenol; 2,5-dimethyl hydroquinone; 2,2-bis(4-hydroxy-3,5-dimethyl phenyl) propane; 2,4,6-trimethyl phenol; bis(4-hydroxy-3,5-di-t-butyl phenyl) sulfide; bis(2-hydroxy-3,5-dimethylphenyl) methane; bis(3-hydroxy-2,5-tetramethylphenyl) methane; 1,3,5-trimethyl-2,4,6-tris-(3,5-di-t-butyl-4-hydroxybenzyl) benzene; 1,1,3-tris-(5-t-butyl-4-hydroxy-2-methylphenyl) butane; octadecyl-3-(3',5'di-t-butyl-4'-hydroxphenyl) propionate; pentaerythrityl-tetrakis 3-(3,5di-t-butyl-4-hydroxyphenyl) propionate!; and tris-(3,5-di-t-butyl-4-hydroxybenzyl) isocyanurate.
Claim 11
Dependent Claim
22 words
The composition according to claim 9, wherein said phenolic compound is selected from 1,1,3-tris-(5-t-butyl-4-hydroxy-2-methylphenyl) butane; octadecyl-3-(3',5'-di-t-butyl-4'-hydroxyphenyl) propionate; tris-(3,5-di-t-butyl-4-hydroxybenzyl) isocyanurate and 1,3,5-trimethyl-2,4,6-tris(3,5-di-t-butyl-4-hydroxybenzyl) benzene.
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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) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |