US4666950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation stabilization of thermoplastic foams
Assignee: Dow Chemical Co
•
Filing: 1986-05-21
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Granted: 1987-05-19
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Expires: 2006-05-21
Abstract
Abstract Thermoplastic resinous foams having improved resistance to oxidation are provided by the incorporation into such foams of a polyvinyl ether of a C 6-30 alcohol.
Inventors
- 👤 Robert H. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:05
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2323/00; C08J2323/02; C08J2429/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
61 words
A process for preparing a polyolefin thermoplastic foam comprising the steps of, (a) heating to a temperature above its melting point a mixture comprising 100 parts by weight of a polyolefin thermoplastic resin, a blowing agent, and from about 0.01 to about 1.0 parts by weight of a polyvinyl ether of a C 6-30 alcohol; and (b) foaming the resulting mixture.
Claim 2
Dependent Claim
61 words
A process for preparing a polyolefin thermoplastic foam comprising the steps of, (a) heating to a temperature above its melting point a mixture comprising 100 parts by weight of a polyolefin thermoplastic resin, a blowing agent, and from about 0.01 to about 1.0 parts by weight of a polyvinyl ether of a C 6-30 alcohol; and (b) foaming the resulting mixture.
Claim 3
Dependent Claim
15 words
A process according to claim 6, wherein the blowing agent comprises a volatile organic compound.
Claim 4
Dependent Claim
18 words
A process according to claim 1, wherein the polyvinyl ether of a C 6-30 alcohol is polyvinyloctadecyl ether.
References Cited (Backward Citations)
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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) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |