US4425443A
Expired / Lapsed
US
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Composition comprising a vinylidene fluoride polymer and a blowing agent
Assignee: Solvay SA
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Filing: 1982-02-24
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Granted: 1984-01-10
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Expires: 2002-02-24
Abstract
Abstract Moulding composition comprising a vinylidene fluoride polymer and a blowing agent which is a hydroxycarboxylic acid or an alkali metal salt derived from one of the acids.
Inventors
- 👤 Pierre Georlette
- 👤 Jean Leva
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; C08J9/08; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
42 words
Composition comprising a vinylidene fluoride polymer and a blowing agent, wherein the blowing agent comprises a hydroxycarboxylic acid or an alkali metal salt derived from one of these acids, having a thermal decomposition temperature below the thermal degradation temperature of the polymer.
Claim 2
Dependent Claim
42 words
Composition comprising a vinylidene fluoride polymer and a blowing agent, wherein the blowing agent comprises a hydroxycarboxylic acid or an alkali metal salt derived from one of these acids, having a thermal decomposition temperature below the thermal degradation temperature of the polymer.
Claim 3
Dependent Claim
14 words
Composition according to claim 1, wherein the blowing agent comprises an alkali metal citrate.
Claim 4
Dependent Claim
15 words
Composition according to claim 1 or 2, wherein the blowing agent also comprises sodium bicarbonate.
Claim 5
Dependent Claim
23 words
Composition according to claim 3, wherein the weight ratio of the alkali metal citrate to the sodium bicarbonate is between 5 and 9.
Claim 6
Dependent Claim
23 words
Composition according to claim 1, wherein it contains from 0.1 to 2% by weight of blowing agent, relative to the weight of polymer.
Claim 7
Dependent Claim
51 words
Composition according to claim 1, wherein it comprises (a) a master mixture of vinylidene fluoride polymer and blowing agent, containing from 20 to 50% by weight of blowing agent, relative to the weight of the polymer, and of (b) an identical or different vinylidene fluoride polymer not containing a blowing agent.
Claim 8
Dependent Claim
23 words
Composition according to claim 6, wherein the polymer in the master mixture is a copolymer of vinylidene fluoride and of monochlorotrifluoroethylene or hexafluoropropylene.
Claim 9
Dependent Claim
41 words
Composition according to claim 1, wherein the vinylidene fluoride polymer is a homopolymer or a copolymer containing (a) at least 50% of units derived from vinylidene fluoride and (b) ethylene units or propylene units substituted by at least two fluorine atoms.
Claim 10
Dependent Claim
21 words
Process for the manufacture of cellular or dense particles comprising employing a composition according to claim 1 as a moulding composition.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |