Polyvinylidene fluoride-polyurethane laminates and method
AssigneeProduits Chimiques Ugine Kuhlmann
InventorAlbert Strassel
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Abstract
The present invention relates to laminates of a polyvinylidene fluoride resin (hereinafter referred to as "PVF.sub.2 ") 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.degree. C., at certain specified velocity gradients.
Claims4
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.degree. 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.sup.-1, set forth below:
- ______________________________________ APPARENT VISCOSITY VALUES VELOCITY GRADIENT Minimum Maximum ______________________________________ 3.54 30 .times. 10.sup.3 200 .times. 10.sup.3 11.81 18 .times. 10.sup.3 93 .times. 10.sup.3 35.4 11 .times. 10.sup.3 47 .times. 10.sup.3 118 6.5 .times. 10.sup.3 21 .times. 10.sup.3 354 3.9 .times. 10.sup.3 10 .times. 10.sup.3 1181 2.3 .times. 10.sup.3 4.5 .times. 10.sup.3 ______________________________________
Dependencies are inferred from the claim text.