US4746573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flowing (free-flowing) granular compositions based on fluorinated elastomers
Assignee: Syensqo Specialty Polymers Italy SpA
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Filing: 1986-03-25
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Granted: 1988-05-24
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Expires: 2006-03-25
Abstract
Abstract Free-flowing granular compositions based on fluoroelastomers containing dispersed on their surface, as an anti-caking agent, from 5% to 70% by weight of a polyolefine powder.
Inventors
- 👤 Vincenzo Arcella
- 👤 Gaetano Bianchi
- 👤 Dionisio D'Auria
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:22
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/124; C08L; C08L23/00; C08L23/02; C08L27/00; C08L27/02; C08L27/12; C08J2327/00; C08J2327/02; C08J2327/12; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
36 words
A free-flowing granular composition based on fluoroelastomers containing dispersed on their surface an anti-caking agent, characterized in that said anti-caking agent is a polyolefin in a powdery form, in quantities between 5% and 70% by weight.
Claim 2
Dependent Claim
36 words
A free-flowing granular composition based on fluoroelastomers containing dispersed on their surface an anti-caking agent, characterized in that said anti-caking agent is a polyolefin in a powdery form, in quantities between 5% and 70% by weight.
Claim 3
Dependent Claim
21 words
A granular composition according to claim 1, characterized in that the fluoroelastomer has a fluorine content greater than 65% by weight.
Claim 4
Dependent Claim
66 words
Granular compositions according to either claim 1 or claim 2, characterized in that the fluoroelastomer is selected from the class consisting of vinylidene fluoride, hexafluoropropylene and tetrafluoroethylene terpolymers; vinylidene fluoride, tetrafluoroethylene and perfluoromethyl-vinyl-ether terpolymers; tetrafluoroethylene and propylene copolymers; vinylidene fluoride and chloro-trifluoroethylene copolymers; vinylidene fluoride hydropentafluoropropylene copolymers; and vinylidene fluoride, hydropentafluoropropylene and tetrafluorethylene terpolymers, and the corresponding products containing in the chain small quantities of bromine.
Claim 5
Dependent Claim
44 words
A granular composition according to claim 1, characterized in that the polyolefin is selected from the class consisting of low, medium and high-density polyethylene; prevailingly isotactic macromolecules with polypropylene; propylene-ethylene copolymers with a predominant content in propylene, both "random" and "block"; and mixtures thereof.
Claim 6
Dependent Claim
16 words
A granular composition according to claim 4, characterized in that the polyolefin is a low-density polyethylene.
Claim 7
Dependent Claim
14 words
A granular composition according to claim 4, characterized in that the polyolefin is polypropylene.
Claim 8
Dependent Claim
33 words
A granular composition according to claim 1 or claim 2, characterized in that besides the polyolefin, there is present a per se known anti-caking agent selected from barium sulphate, calcium stearate, and talc.
Claim 9
Dependent Claim
42 words
A process for preparing a free-flowing granular fluoroelastomer comprising admixing said fluoroelastomer with from 5 to 70% by weight of a polyolefin in the form of a powder, thereby providing a coating of polyolefin powder on the surface of the fluoroelastomer granules.
Claim 10
Dependent Claim
42 words
A process for preparing a free-flowing granular fluoroelastomer comprising admixing said fluoroelastomer with from 5 to 70% by weight of a polyolefin in the form of a powder, thereby providing a coating of polyolefin powder on the surface of the fluoroelastomer granules.
Claim 11
Dependent Claim
21 words
A process according to claim 8, wherein the fluoroelastomer is admixed with from 10 to 30% by weight of the polyolefin.
Claim 12
Dependent Claim
22 words
A process according to claim 8 or 9 characterized in that the fluoroelastomer has a fluorine content greater than 65% by weight.
Claim 13
Dependent Claim
65 words
A process according to claim 8 or 9, characterized in that the fluoroelastomer is selected from the class consisting of vinylidene fluoride, hexafluoropropylene and tetrafluoroethylene terpolymers; vinylidene fluoride, tetrafluoroethylene and perfluoromethyl-vinyl-ether terpolymers; tetrafluoroethylene and propylene copolymers; vinylidene fluoride and chloro-trifluoroethylene copolymers; vinylidene fluoride and hydropentafluoropropylene copolymers; and vinylidene fluoride, hydropentafluoropropylene and tetrafluoroethylene terpolymers, and the corresponding products containing in the chain small quantities of bromine.
Claim 14
Dependent Claim
49 words
A process according to claim 8 or 9, characterized in that the polyolefin is selected from the class consisting of low, medium and high-density polyethylene; polypropylene having prevailingly isotactic macromolecules; propylene-ethylene copolymers with a predominant content of propylene, either with a random or a block distribution; and mixtures thereof.
Claim 15
Dependent Claim
15 words
A process according to claim 12, characterized in that the polyolefin is a low-density polyethylene.
Claim 16
Dependent Claim
17 words
A process according to claim 12, characterized in that the polyolefin is polypropylene having prevailingly isotactic macromolecules.
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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) | 1991-05-24 | 1991-11-23 | 1992-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-24 | 1995-11-23 | 1996-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-24 | 1999-11-23 | 2000-05-24 | $7700.00 | Window Closed / Lapsed |