US4360602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamed chlorinated polyvinyl chloride and compositions for making same
Assignee: Goodrich Corp
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Filing: 1981-09-14
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Granted: 1982-11-23
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Expires: 2001-09-14
Abstract
Abstract Composition of matter that can be foamed to form an expanded product having density of less than 20 lbs/ft 3 and containing a preponderance of the cells in the size range of less than 500 microns comprising a mixture of chlorinated polyvinyl chloride, 5 to 50 parts by weight of the chlorofluoroalkane of 1 to 2 carbon atoms as a primary blowing agent and 0.01 to 2 parts by weight of azodicarbonamide that is dispersed through the resin and forms cell nuclei from which expanded cells are created, all based on 100 parts by weight of the resin.
Inventors
- 👤 Samuel D. Nehmey
- 👤 James W. Summers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:31
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/0061; C08J2327/00; C08J2327/22; C08J2327/24; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S264/13; Y10S521/00; Y10S521/909; Y10S521/91
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
150 words
A foam product comprising expanded chlorinated polyvinyl chloride resin having a minimum chlorine content of at least 60% by weight composed of numerous cells throughout containing 5 to 50 parts by weight of a chlorofluoroalkane of 1 to 2 carbon atoms and retained nitrogen that is a decomposition product of 0.01 to 2 parts by weight of azodicarbonamide, all amounts are based on 100 parts by weight of the resin, the azodicarbonamide forms cell nuclei containing nitrogen as a decomposition product thereof which cell nuclei form expanded cells when the chlorofluoroalkane is introduced and expanded, the foam has a density of less than 20 lbs/ft 3 , at least 60% of the cells in the foam are closed cells, and the cells are smaller than 500 microns, said product being devoid of a substantial amount of an inorganic powdery substance and a substantial amount of a solvent for the resin.
Claim 2
Dependent Claim
150 words
A foam product comprising expanded chlorinated polyvinyl chloride resin having a minimum chlorine content of at least 60% by weight composed of numerous cells throughout containing 5 to 50 parts by weight of a chlorofluoroalkane of 1 to 2 carbon atoms and retained nitrogen that is a decomposition product of 0.01 to 2 parts by weight of azodicarbonamide, all amounts are based on 100 parts by weight of the resin, the azodicarbonamide forms cell nuclei containing nitrogen as a decomposition product thereof which cell nuclei form expanded cells when the chlorofluoroalkane is introduced and expanded, the foam has a density of less than 20 lbs/ft 3 , at least 60% of the cells in the foam are closed cells, and the cells are smaller than 500 microns, said product being devoid of a substantial amount of an inorganic powdery substance and a substantial amount of a solvent for the resin.
Claim 3
Dependent Claim
67 words
Product of claim 1 having density of about 1 to 5 lbs/ft 3 , thermal conductivity at room temperature of less than 0.20 Btu/(hr) (ft 2 ) (°F./in), at least 85% of the cells being closed cells, the resin having a glass transition temperature of at least 105° C. and a chlorine content of at least 64%, and amount of the chlorofluoroalkane is 10 to 40 parts.
Claim 4
Dependent Claim
25 words
Product of claim 2 wherein preponderance of the cells are 200 microns or smaller in size and amount of azodicarbonamide is 0.1 to 1 parts.
Claim 5
Dependent Claim
42 words
Product of claim 3 wherein the resin has chlorine content of about 64% to 73%, the product has a density of about 1 to 5 lbs/ft 3 and also includes an effective amount of a lubricant, a processing aid, and a stabilizer.
Claim 6
Dependent Claim
93 words
Composition of matter that can be foamed to form an expanded product having density of less than 20 lbs/ft 3 and cell size less than 500 microns comprising a mixture of chlorinated polyvinyl chloride resin having a minimum chlorine content of at least 60% by weight, 5 to 50 parts by weight of the resin of a primary blowing agent selected from chlorofluoroalkane of 1 to 2 carbon atoms, and 0.1 to 2 parts by weight of the resin of azodicarbonamide nucleating agent, all based on 100 parts by weight of the resin.
Claim 7
Dependent Claim
93 words
Composition of matter that can be foamed to form an expanded product having density of less than 20 lbs/ft 3 and cell size less than 500 microns comprising a mixture of chlorinated polyvinyl chloride resin having a minimum chlorine content of at least 60% by weight, 5 to 50 parts by weight of the resin of a primary blowing agent selected from chlorofluoroalkane of 1 to 2 carbon atoms, and 0.1 to 2 parts by weight of the resin of azodicarbonamide nucleating agent, all based on 100 parts by weight of the resin.
Claim 8
Dependent Claim
31 words
Composition of claim 5 wherein said resin contains at least 64% chlorine, amount of the primary blowing agent is 10 to 40 parts and amount of azodicarbonamide is 0.1 to 1%.
Claim 9
Dependent Claim
47 words
Composition of matter of claim 5 that is adapted to be foamed to form an expanded product having density of 1 to 5 lbs/ft 3 that includes an effective amount of a stabilizer, an effective amount of a processing aid, and an effective amount of a lubricant.
Claim 10
Dependent Claim
49 words
Composition of claim 7 wherein amount of the stabilizer is 0.5 to 5 parts by weight, amount of the processing aid is 1 to 30 parts by weight, and amount of the lubricant is 1 to 5 parts by weight, based on 100 parts by weight of the resin.
Claim 11
Dependent Claim
26 words
Composition of claim 8 wherein the resin has a glass transition temperature of at least about 105° C. and chlorine content of about 64 to 73%.
Claim 12
Dependent Claim
25 words
Composition of claim 9 wherein the resin and azodicarbonamide are in powder form and the primary blowing agent is trichlorofluoromethane in liquid form under pressure.
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) | 1985-11-22 | 1986-05-24 | 1986-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-22 | 1990-05-24 | 1990-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-22 | 1994-05-24 | 1994-11-23 | $7700.00 | Window Closed / Lapsed |