US3868337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vinylidene fluoride/hexafluoropropylene copolymer foams
Assignee: SOCIETY SUPERFLEXIT
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Filing: 1972-08-16
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Granted: 1975-02-25
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Expires: 1992-08-16
Abstract
Abstract Closed-cell foams are prepared from low viscosity vinylidene fluoride/hexafluoropropylene copolymers by vulcanising the copolymer in the presence of a blowing agent using as vulcanisation agent a metal oxide or hydroxide. Particular vulcanisation agents are the oxides and hydroxides of lead and calcium, and mixtures of the oxides and hydroxides of magnesium and zinc with lead or zinc salts.
Inventors
- 👤 Paul Gros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:41
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J2327/00; C08J2327/02; C08J2327/12; Y; Y10; Y10S; Y10S521/00; Y10S521/909
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
166 words
PROCESS FOR THE PREPARATION OF A CLOSE-CELL FOAM FROM A VINYLIDENE FLUORIDE/HEXAFLUOROPROPYLENE COPOLYMER OF LOW VISCOSITY, WHICH COMPRISES MOULDING A MIXTURE COMPRISING 80 TO 120 PARTS BY WEIGHT OF THE MILLED COPOLYMER, 4 TO 8 PARTS BY WEIGHT OF AN AZODICARBONAMIDE BLOWING AGENT, 9 TO 11 PARTS BY WEIGHT OF CARBON BLACK, 8 TO 12 PARTS BY WEIGHT OF AT LEAST ONE VULCANISING AGENT SELECTED FROM THE OXIDES AND HYDROXIDES OF LEAD AND CALCIUM, MIXTURES OF THE OXIDES AND HYDROXIDES OF LEAD OR CALCIUM WITH A SALT SELECTED FROM THE INORGANIC AND ORGANIC SALTS OF LEAD AND ZINC, A MIXTURE OF ZNO AND PBCI2, AND A MIXTURE OF MGO AND ZINC STERATE, 1.8 TO 2.2 PARTS BY WEIGHT OF AN ACTIVATOR FOR THE BLOWING AGENT, AND 0.7 TO 0.9 PARTS BY WEIGHT OF A VULCANISATION ACCELERATOR; THE MOULDING BEING AFFECTED BY A TEMPERATURE OF APPROXIMATELY FROM 140*C TO 200*C, UNDER A PRESSURE OF FROM 60 TO 100 KG/CN2, FOR A MINIMUM PERIOD OF ABOUT 30 MINUTES.
Claim 2
Dependent Claim
166 words
PROCESS FOR THE PREPARATION OF A CLOSE-CELL FOAM FROM A VINYLIDENE FLUORIDE/HEXAFLUOROPROPYLENE COPOLYMER OF LOW VISCOSITY, WHICH COMPRISES MOULDING A MIXTURE COMPRISING 80 TO 120 PARTS BY WEIGHT OF THE MILLED COPOLYMER, 4 TO 8 PARTS BY WEIGHT OF AN AZODICARBONAMIDE BLOWING AGENT, 9 TO 11 PARTS BY WEIGHT OF CARBON BLACK, 8 TO 12 PARTS BY WEIGHT OF AT LEAST ONE VULCANISING AGENT SELECTED FROM THE OXIDES AND HYDROXIDES OF LEAD AND CALCIUM, MIXTURES OF THE OXIDES AND HYDROXIDES OF LEAD OR CALCIUM WITH A SALT SELECTED FROM THE INORGANIC AND ORGANIC SALTS OF LEAD AND ZINC, A MIXTURE OF ZNO AND PBCI2, AND A MIXTURE OF MGO AND ZINC STERATE, 1.8 TO 2.2 PARTS BY WEIGHT OF AN ACTIVATOR FOR THE BLOWING AGENT, AND 0.7 TO 0.9 PARTS BY WEIGHT OF A VULCANISATION ACCELERATOR; THE MOULDING BEING AFFECTED BY A TEMPERATURE OF APPROXIMATELY FROM 140*C TO 200*C, UNDER A PRESSURE OF FROM 60 TO 100 KG/CN2, FOR A MINIMUM PERIOD OF ABOUT 30 MINUTES.
Claim 3
Dependent Claim
33 words
Process according to claim 1, wherein the vulcanising agent is selected from oxides and hydroxides of lead and calcium mixed with a salt selected from inorganic and organic salts of zinc and lead.
Claim 4
Dependent Claim
11 words
Process according to claim 1, wherein the vulcanising agent comprises litharge.
Claim 5
Dependent Claim
17 words
Process according to claim 2, wherein the said salt is selected from zinc stearate and lead stearate.
Claim 6
Dependent Claim
25 words
A process according to claim 3, wherein the vulcanising agent is a mixture of litharge and a salt selected from zinc stearate and lead stearate.
Claim 7
Dependent Claim
17 words
Process according to claim 1, wherein the blowing agent is selected from azodicarbonamide and its N-substituted homologues.
Claim 8
Dependent Claim
17 words
Process according to claim 6, wherein the blowing agent is selected from N,N''-di-(tertiary butyl)-azo-bis-formamide, N,N''-di-(n-decyl)-azo-bis-formamide and N,N''-diphenyl-azo-bis-formamide.
Claim 9
Dependent Claim
18 words
Process according to claim 1, wherein the vulcanisation accelerator is selected from substituted and unsubstituted quinones and phenols.
Claim 10
Dependent Claim
35 words
Process according to claim 8, wherein the vulcanisation accelerator is selected from phenol, o-, m- and p-chlorophenol, guaiacol, the cresols, resorcinol, hydroquinone, pyrocatechol, pyrogallol, phloroglucinol, the Alpha - and Beta -naphthols, benzoquinone, tetrachlorobenzoquinone and para-benzoquinonedioxime.
Claim 11
Dependent Claim
15 words
Process according to claim 1, wherein the activator for the blowing agent is a glycol.
Claim 12
Dependent Claim
22 words
Process according to claim 1, wherein a crosslinking activator selected from primary and secondary aromatic amines is incorporated in the moulding mixture.
Claim 13
Dependent Claim
11 words
Process according to claim 1, wherein the crosslinking activator is dibenzylamine.
Claim 14
Dependent Claim
34 words
Process according to claim 1, wherein the vulcanizing agent is PbO, CaO, Ca(OH)2, a mixture of ZnO and PbCl2, a mixture of CaO and zinc stearate or a mixture of MgO and zinc stearate.
References Cited (Backward Citations)
US3023187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |