US4489913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroconductive foams
Assignee: Dow Chemical Co
•
Filing: 1984-03-19
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Granted: 1984-12-25
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Expires: 2004-03-19
Abstract
Abstract Electroconductive foams are prepared by dehydrohalogenating a foam containing a halogen-containing polymer.
Inventors
- 👤 Arthur E. Gurgiolo
- 👤 Thomas M. Knobel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:02
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J9/36; C08J2375/00; C08J2375/04; C08J2427/00; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
84 words
A method for preparing an electroconductive foam which comprises: (1) saturating a foam comprising a polymer containing a plurality of urethane or thiourethane or thiourea or isocyanurate or thioisocyanurate or a combination of such groups which foam also contains a halogenated polymer with a dehydrohalogenating agent at a temperature and time sufficient to at least partially dehydrohalogenate the halogenated polymer; (2) washing the foam with a suitable inert medium so as to substantially remove the dehydrohalogenating agent and (3) drying the thus treated foam.
Claim 2
Independent Claim
84 words
A method for preparing an electroconductive foam which comprises: (1) saturating a foam comprising a polymer containing a plurality of urethane or thiourethane or thiourea or isocyanurate or thioisocyanurate or a combination of such groups which foam also contains a halogenated polymer with a dehydrohalogenating agent at a temperature and time sufficient to at least partially dehydrohalogenate the halogenated polymer; (2) washing the foam with a suitable inert medium so as to substantially remove the dehydrohalogenating agent and (3) drying the thus treated foam.
Claim 3
Dependent Claim
41 words
A method of claim 1 wherein said dehydrohalogenating agent is a primary amine and the foam saturated therewith is subject to a temperature of from about 15° C. to about 250° C. for from about 2 minutes to about 14 days.
Claim 4
Dependent Claim
32 words
A method of claim 2 wherein said treated foam is subjected to a temperature of from about 25° C. to about 120° C. for from about 8 minutes to about 8 hours.
Claim 5
Dependent Claim
13 words
A method of claim 3 wherein said dehydrohalogenating agent is a polyalkylene polyamine.
Claim 6
Dependent Claim
11 words
A method of claim 4 wherein said polyalkylene polyamine is diethylenetriamine.
Claim 7
Independent Claim
31 words
A method of claims 1, 2, 3, 4 or 5 wherein step 2 is accomplished by one or more water wash steps optionally followed by one or more alcohol wash steps.
Claim 8
Dependent Claim
10 words
A method of claim 6 wherein said alcohol is methanol.
Claim 9
Independent Claim
26 words
A method of claims 1, 2, 3, 4 or 5 wherein said halogenated polymer is a polymer or copolymer containing vinyl chloride and/or vinylidene chloride copolymer.
Claim 10
Dependent Claim
21 words
A method of claim 6 wherein said halogenated polymer is a polymer or copolymer containing vinyl chloride and/or vinylidene chloride copolymer.
Claim 11
Dependent Claim
20 words
A method of claim 7 wherein halogenated polymer is a polymer or copolymer containing vinyl chloride and/or vinylidene chloride copolymer.
References Cited (Backward Citations)
US3852223A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |