EP0186180A2
Expired / Lapsed
EP
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High molecular weight fluoroelastomer
Assignee: EIDP Inc
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Filing: 1985-12-23
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Granted: —
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Expires: 2005-12-23
Abstract
Abstract A high molecular weight fluoroelastomer is provided comprising 65 to 100 wt% of vinylidene fluoride units and hexafluoropropylene units and 35 to 0 wt% of tetrafluoroethylene units exhibiting low compression set and high elongation properties and showing good processability.
Inventors
- 👤 Yoshinori Masuda
- 👤 Hiroshi Saito
- 👤 Hiroshi Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 19:17
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/18; C08F14/22; C08F214/00; C08F214/18; C08F214/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
136 words
A fluoroelastomer containing 65 to 100 wt% of vinylidene fluoride units and hexafluoropropylene units and 35 to 0 wt% of tetrafluoroethylene units, the fluoroelastomer having the following characteristics: (a) the weight ratio of vinylidene fluoride units to hexafluoropropylene units is in the range of 80:20 to 50:50; (b) the intrinsic viscosity is in the range of 250 to 500 mℓ/g; (c) the ratio (Mw/Mn) of weight-average molecular weight (Mw) to number-average molecular weight (Rn) is in the range of 2 to 12; and (d) said fluoroelastomer has a bimodal molecular weight distribution, and the ratio (h 2 /h l ) of the peak-height (h 2 ) of higher molecular weight to the peak-height (h l ) of lower molecular weight shown by a chart of gel permeation chromatography is in the range of 0.8 to 4.0.
Claim 2
Dependent Claim
136 words
A fluoroelastomer containing 65 to 100 wt% of vinylidene fluoride units and hexafluoropropylene units and 35 to 0 wt% of tetrafluoroethylene units, the fluoroelastomer having the following characteristics: (a) the weight ratio of vinylidene fluoride units to hexafluoropropylene units is in the range of 80:20 to 50:50; (b) the intrinsic viscosity is in the range of 250 to 500 mℓ/g; (c) the ratio (Mw/Mn) of weight-average molecular weight (Mw) to number-average molecular weight (Rn) is in the range of 2 to 12; and (d) said fluoroelastomer has a bimodal molecular weight distribution, and the ratio (h 2 /h l ) of the peak-height (h 2 ) of higher molecular weight to the peak-height (h l ) of lower molecular weight shown by a chart of gel permeation chromatography is in the range of 0.8 to 4.0.
Claim 3
Dependent Claim
24 words
A fluoroelastomer according to claim 1, wherein the ratio of vinylidene fluoride units to hexafluoropropylene units is in the range of 75:25 to 50:50.
Claim 4
Dependent Claim
21 words
A fluoroelastomer according to claim 1 or 2, wherein the intrinsic viscosity is in the range of 250 to 450 ml/g.
Claim 5
Dependent Claim
21 words
A fluoroelastomer according to claim 1 or 2, wherein the intrinsic viscosity is in the range of 250 to 300 ml/g.
Claim 6
Dependent Claim
27 words
A fluoroelastomer according to any of the claims 1 to 4, wherein the ratio ( M w/ M n) is in the range of 4 to 12.
Claim 7
Dependent Claim
23 words
A fluoroelastomer according to any of the claims 1 to 5, wherein said ratio h 2/ h 1 is from 1.2 to 2.4.
References Cited (Backward Citations)
No citation records indexed.
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