US4413065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making low density chlorinated polyvinyl chloride foam
Assignee: Noveon IP Holdings Corp
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Filing: 1983-02-09
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Granted: 1983-11-01
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Expires: 2003-02-09
Abstract
Abstract A low density foam product is formed from a chlorinated polyvinyl chloride polymer (CPVC) composition containing a primary blowing agent and a nucleating system comprised of an alkali metal borohydride and a proton donor activator.
Inventors
- 👤 Dale R. Hall
- 👤 Charles N. Bush
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:11
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/065; C08J9/0066; C08J9/12; C08J9/14; C08J9/143; C08J2327/00; C08J2327/22; C08J2327/24; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S521/00; Y10S521/908; Y10S521/909; Y10S521/91
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
101 words
A low density foam product comprising expanded chlorinated polyvinyl chloride polymer said polymer having a chlorine content of from 60% to 73% by weight having an essentially closed-cell cellular structure composed predominantly of cells having a cell size less than 500 microns, said cells containing a gas derived from a primary blowing agent and hydrogen gas derived from the activation of a nucleating system composed of an alkali metal borohydride and a proton donor activator compatible with said polymer selected from the group consisting of hydrated salts and organic acids, said foam having a density less than 20 lbs/ft 3 .
Claim 2
Dependent Claim
101 words
A low density foam product comprising expanded chlorinated polyvinyl chloride polymer said polymer having a chlorine content of from 60% to 73% by weight having an essentially closed-cell cellular structure composed predominantly of cells having a cell size less than 500 microns, said cells containing a gas derived from a primary blowing agent and hydrogen gas derived from the activation of a nucleating system composed of an alkali metal borohydride and a proton donor activator compatible with said polymer selected from the group consisting of hydrated salts and organic acids, said foam having a density less than 20 lbs/ft 3 .
Claim 3
Dependent Claim
20 words
The low density foam product of claim 1 wherein said foam has a predominant cell size less than 350 microns.
Claim 4
Dependent Claim
22 words
The low density foam product of claim 1 wherein said foam has a density of from 1 to 10 lbs/ft 3 .
Claim 5
Dependent Claim
24 words
The low density foam product of claim 1 wherein said foam has a thermal conductivity of less than 0.20 BTU/(hr) (ft 2 ) (°F./in).
Claim 6
Dependent Claim
22 words
The low density foam product of claim 2 wherein said foam has a density of from 1 to 10 lbs/ft 3 .
Claim 7
Dependent Claim
37 words
The low density foam product of claim 1 wherein said chlorinated polyvinyl chloride polymer has a density of from 1.46 to 1.66 gms/cc at 25° C. and a chlorine content of from 60% to 73% by weight.
Claim 8
Dependent Claim
27 words
The low density foam product of claim 6 wherein said gaseous material derived from said primary blowing agent is a chlorofluoroalkane containing 1 to 2 carbon atoms.
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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) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |