US4076929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vinylidene fluoride polymer having improved melt flow properties
Assignee: Arkema Inc
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Filing: 1975-10-30
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Granted: 1978-02-28
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Expires: 1995-10-30
Abstract
Abstract A high molecular weight vinylidene fluoride polymer resin having improved melt flow properties and further characterized as having a bimodal molecular weight distribution, as measured by gel permeation chromatography, and a specified critical shear stress.
Inventors
- 👤 Julius Eugene Dohany
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:18
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/28; C08F; C08F14/00; C08F14/18; C08F14/22; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/16; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
72 words
A high molecular weight vinylidene fluoride polymer resin which is a homopolymer or a copolymer of at least 75 mol percent vinylidene fluoride copolymerized with at least one other monomer selected from the group consisting of halogenated ethylenes, halogenated propylenes and halogenated butylenes, said polymer having a distinct bimodal molecular weight distribution, as indicated by gel permeation chromatography, and a critical shear stress of at least 3 million dynes per square centimeter.
Claim 2
Dependent Claim
72 words
A high molecular weight vinylidene fluoride polymer resin which is a homopolymer or a copolymer of at least 75 mol percent vinylidene fluoride copolymerized with at least one other monomer selected from the group consisting of halogenated ethylenes, halogenated propylenes and halogenated butylenes, said polymer having a distinct bimodal molecular weight distribution, as indicated by gel permeation chromatography, and a critical shear stress of at least 3 million dynes per square centimeter.
Claim 3
Dependent Claim
14 words
The vinylidene fluoride polymer resin of claim 1 wherein the polymer is a homopolymer.
Claim 4
Dependent Claim
14 words
The vinylidene fluoride polymer resin of claim 1 wherein the polymer is a copolymer.
Claim 5
Dependent Claim
22 words
The vinylidene fluoride polymer resin of claim 1 wherein the critical shear stress is at least 4 million dynes per square centimeter.
Claim 6
Dependent Claim
21 words
The vinylidene fluoride polymer of claim 2 wherein the critical shear stress is at least 4 million dynes per square centimeter.
Claim 7
Dependent Claim
39 words
The vinylidene fluoride polymer resin of claim 2 wherein the bimodal molecular weight distribution includes a high molecular weight spike of more than 30 up to about 70 percent of the total area under the gel permeation chromatography curve.
Claim 8
Dependent Claim
21 words
The vinylidene fluoride resin of claim 6 wherein the critical shear stress is at least 4 million dynes per square centimeter.
Claim 9
Dependent Claim
13 words
The vinylidene fluoride polymer resin of claim 1 which is crosslinked by radiation.
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) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |