US4291099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinylidene fluoride-polyurethane laminates and method
Assignee: Produits Chimiques Ugine Kuhlmann
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Filing: 1980-01-17
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Granted: 1981-09-22
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Expires: 2000-01-17
Abstract
Abstract The present invention relates to laminates of a polyvinylidene fluoride resin (hereinafter referred to as "PVF2") and a thermoplastic polyurethane that are formed without the use of any intermediate bonding agent and to the method of making such laminates, preferably by co-extrusion, wherein the polyvinylidene fluoride resin must have a certain specified apparent viscosity, at 200 DEG C., at certain specified velocity gradients.
Inventors
- 👤 Albert Strassel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:41
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/10; B29C48/14; B29C48/147; B29C48/1472; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/305; B29C48/307; B29C48/32; B29C48/335; B32B27/30; B32B27/304; B32B27/40; B32B37/00; B32B37/14; B32B37/15; B32B37/153; B32B7/00; B32B7/04; B32B7/12; B29C2791/00; B29C2791/004; B29C2791/007; B32B2250/00; B32B2250/02; B32B2309/00; B32B2309/02; B32B2309/14; B32B2327/00; B32B2327/12; B32B2375/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31551; Y10T428/31573; Y10T428/3158
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
140 words
A laminate comprising a layer of a polyvinylidene fluoride resin having adhered to at least one surface thereof without any intermediate bonding agent, a layer of a thermoplastic polyurethane resin, said laminate being formed by bringing into contact at least one fluid stream of each of said resins while said stream of a polyvinylidene fluoride has, at 200° C., an apparent viscosity, in poises, between the minimum and maximum values set forth below for at least two of the velocity gradients, in sec -1 , set forth below: ______________________________________
APPARENT
VISCOSITY VALUES
VELOCITY GRADIENT Minimum Maximum
______________________________________
3.54 30 × 10.sup.3
200 × 10.sup.3
11.81 18 × 10.sup.3
93 × 10.sup.3
35.4 11 × 10.sup.3
47 × 10.sup.3
118 6.5 × 10.sup.3
21 × 10.sup.3
354 3.9 × 10.sup.3
10 × 10.sup.3
1181 2.3 × 10.sup.3
4.5 × 10.sup.3
______________________________________
Claim 2
Dependent Claim
140 words
A laminate comprising a layer of a polyvinylidene fluoride resin having adhered to at least one surface thereof without any intermediate bonding agent, a layer of a thermoplastic polyurethane resin, said laminate being formed by bringing into contact at least one fluid stream of each of said resins while said stream of a polyvinylidene fluoride has, at 200° C., an apparent viscosity, in poises, between the minimum and maximum values set forth below for at least two of the velocity gradients, in sec -1 , set forth below: ______________________________________
APPARENT
VISCOSITY VALUES
VELOCITY GRADIENT Minimum Maximum
______________________________________
3.54 30 × 10.sup.3
200 × 10.sup.3
11.81 18 × 10.sup.3
93 × 10.sup.3
35.4 11 × 10.sup.3
47 × 10.sup.3
118 6.5 × 10.sup.3
21 × 10.sup.3
354 3.9 × 10.sup.3
10 × 10.sup.3
1181 2.3 × 10.sup.3
4.5 × 10.sup.3
______________________________________
Claim 3
Dependent Claim
49 words
The laminate according to claim 1 wherein the said thermoplastic polyurethane resin has an apparent viscosity, at 200° C., which at the maximum is one-fourth as large as that of said polyvinylidene fluoride resin for the same at least two velocity gradients used to define said polyvinylidene fluoride resin.
Claim 4
Dependent Claim
29 words
The laminate according to claims 1 or 2 including at least one additional layer of resin adhered to said polyvinylidene fluoride resin layer or said thermoplastic polyurethane resin layer.
Claim 5
Dependent Claim
51 words
The laminate according to claim 1 or 2 wherein said polyvinylidene fluoride resin is selected from homopolymers of polyvinylidene fluoride copolymers containing at least 70% by weight of polyvinylidene fluoride, or mixtures of polyvinylidene fluoride with other polymers and said thermoplastic polyurethane is selected from linear or only slightly cross-linked polyurethanes.
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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) | 1984-09-21 | 1985-03-23 | 1985-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-21 | 1989-03-23 | 1989-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-21 | 1993-03-23 | 1993-09-22 | $7700.00 | Window Closed / Lapsed |