US4369257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foaming synthetic resin compositions stabilized with certain naphthyl amine compounds
Assignee: Dow Chemical Co
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Filing: 1982-02-01
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Granted: 1983-01-18
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Expires: 2002-02-01
Abstract
Abstract Substantially closed-cell aliphatic olefin polymer foams having improved dimensional stability are provided by the inclusion therein of from 0.1 to 10 weight percent, based upon the olefin polymer, of certain naphthyl amine compounds.
Inventors
- 👤 Tsuneo Hoki
- 👤 Minoru Hisamatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:23
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0028; C08J2323/00; C08J2323/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
121 words
An extrusion foaming process for expanding an aliphatic olefin polymer which comprises (1) heat plastifying said olefin polymer; (2) admixing with said heat plastified olefin polymer under conditions of elevated temperature and pressure a volatile organic blowing agent and from 0.1 to 10 weight percent based upon said olefin polymer of a compound of the formula (I): A--NH--B--NH--A' (I) wherein A and A', which may be the same or different, each represent α- or β-naphthyl group and B represents a radical selected from a group consisting of p- and m-phenylene groups, a p,p'-diphenylene group, and a m,m'-diphenylene group; and (3) extruding the resultant heat plastified mixture into a zone of lower pressure to thereby produce an aliphatic olefin polymer foam product.
Claim 2
Dependent Claim
121 words
An extrusion foaming process for expanding an aliphatic olefin polymer which comprises (1) heat plastifying said olefin polymer; (2) admixing with said heat plastified olefin polymer under conditions of elevated temperature and pressure a volatile organic blowing agent and from 0.1 to 10 weight percent based upon said olefin polymer of a compound of the formula (I): A--NH--B--NH--A' (I) wherein A and A', which may be the same or different, each represent α- or β-naphthyl group and B represents a radical selected from a group consisting of p- and m-phenylene groups, a p,p'-diphenylene group, and a m,m'-diphenylene group; and (3) extruding the resultant heat plastified mixture into a zone of lower pressure to thereby produce an aliphatic olefin polymer foam product.
Claim 3
Dependent Claim
35 words
The process of claim 1, wherein the aliphatic olefin polymer is polyethylene or an ethylene copolymer derived from a major proportion of ethylene with a minor proportion of one or more other monomers copolymerizable therewith.
Claim 4
Dependent Claim
14 words
The process of claim 1, wherein the formula I compound is N,N'-di-β-naphthyl-paraphenylenediamine or N,N'-di-β-naphthyl-paradiphenylenediamine.
References Cited (Backward Citations)
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Cited
US2448799A
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US2727879A
Cited
US3017371A
Cited
US3645931A
Cited
US3645930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-17 | 1986-07-19 | 1987-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-17 | 1990-07-19 | 1991-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-17 | 1994-07-19 | 1995-01-18 | $7700.00 | Window Closed / Lapsed |