Patent US4239041A successfully refreshed from Google Patents.
Patent US4328151A successfully refreshed from Google Patents.
US4328151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated carbon fiber reinforced poly(vinylidene fluoride)
Assignee: Arkema Inc
•
Filing: 1981-04-03
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Granted: 1982-05-04
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Expires: 2001-04-03
Abstract
Abstract Low shrinkage, mechanically strong, acid stable, carbon fiber reinforced poly(vinylidene fluoride) resin compositions are prepared by extrusion blending carbon fibers, which have been precoated with poly(vinylidene fluoride), with a poly(vinylidene fluoride) resin.
Inventors
- 👤 Donald N. Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:35
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/22; C08J3/226; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/06; C08K9/00; C08K9/08; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/16; C08J2427/00; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2938
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
76 words
A low shrinkage, strong, acid stable, reinforced poly(vinylidene fluoride) composition comprising a poly(vinylidene fluoride) resin mixed with carbon fibers which have been precoated with poly(vinylidene fluoride) wherein the carbon fiber length is from about 3 to 15 mm, the carbon fibers are precoated with at least about 3 percent by weight of poly(vinylidene fluoride) and the precoated carbon fibers are present in an amount of from about 5 to 20 parts by weight of the composition.
Claim 2
Dependent Claim
76 words
A low shrinkage, strong, acid stable, reinforced poly(vinylidene fluoride) composition comprising a poly(vinylidene fluoride) resin mixed with carbon fibers which have been precoated with poly(vinylidene fluoride) wherein the carbon fiber length is from about 3 to 15 mm, the carbon fibers are precoated with at least about 3 percent by weight of poly(vinylidene fluoride) and the precoated carbon fibers are present in an amount of from about 5 to 20 parts by weight of the composition.
Claim 3
Dependent Claim
24 words
The composition of claim 1 wherein the carbon fibers are coated with from about 3 to 10 percent by weight of the poly(vinylidene fluoride).
Claim 4
Dependent Claim
26 words
The composition of claim 2 wherein the coated carbon fibers are present in amount of from about 5 to 20 parts by weight of the composition.
Claim 5
Dependent Claim
17 words
The composition of claim 2 wherein the carbon fiber length is from about 3 to 15 mm.
Claim 6
Dependent Claim
51 words
The composition of claim 1 wherein the carbon fibers contain about 5 to 6 percent by weight of poly(vinylidene fluoride), the carbon fibers have an original length of at least about 6 mm and the carbon fibers are present in an amount of about 10 percent by weight of the composition.
Claim 7
Dependent Claim
53 words
A process of preparing a low shrinkage, strong, acid stable, reinforced poly(vinylidene fluoride) composition comprising melt blending poly(vinylidene fluoride) coated carbon fibers with a poly(vinylidene fluoride) resin by heating and mixing the resin and the coated carbon fibers with low shearing such that attrition of the length of the carbon fibers is minimized.
Claim 8
Dependent Claim
53 words
A process of preparing a low shrinkage, strong, acid stable, reinforced poly(vinylidene fluoride) composition comprising melt blending poly(vinylidene fluoride) coated carbon fibers with a poly(vinylidene fluoride) resin by heating and mixing the resin and the coated carbon fibers with low shearing such that attrition of the length of the carbon fibers is minimized.
Claim 9
Dependent Claim
13 words
The process of claim 6 wherein the melt blending is by extrusion blending.
Claim 10
Dependent Claim
27 words
The process of claim 6 wherein the coated carbon fibers are present in an amount of from about 5 to 20 percent by weight of the composition.
Claim 11
Dependent Claim
17 words
The process of claim 6 wherein the carbon fiber length is from about 3 to 15 mm.
Claim 12
Dependent Claim
50 words
The process of claim 6 wherein the carbon fibers contain about 5 to 6 percent by weight of poly(vinylidene fluoride), and carbon fibers have a length of at least about 6 mm and the carbon fibers are present in an amount of about 10 percent by weight of the composition.
Claim 13
Dependent Claim
54 words
A low shrinkage, high tensile strength, acid stable shaped article of poly(vinylidene fluoride) resin having dispersed therein from about 5 to 20 percent by weight of carbon fibers having a length of from about 3 to 15 mm which fibers have been precoated with about 3 to 10 percent by weight of poly(vinylidene fluoride).
Claim 14
Dependent Claim
54 words
A low shrinkage, high tensile strength, acid stable shaped article of poly(vinylidene fluoride) resin having dispersed therein from about 5 to 20 percent by weight of carbon fibers having a length of from about 3 to 15 mm which fibers have been precoated with about 3 to 10 percent by weight of poly(vinylidene fluoride).
Claim 15
Dependent Claim
17 words
The article of claim 11 wherein the fibers have a length of at least about 6 mm.
Claim 16
Dependent Claim
50 words
The article of claim 11 wherein the mold shrinkage is less than about 0.25 percent, the tensile strength is above about 4,500 psi at 140° C. and the ambient tensile strength is at least about 90 percent retained after immersion for one week in 10% aqueous HCl at 100° C.
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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) | 1985-05-03 | 1985-11-02 | 1986-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-03 | 1989-11-02 | 1990-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-03 | 1993-11-02 | 1994-05-04 | $7700.00 | Window Closed / Lapsed |