Abstract: The invention relates to an article containing at least three layers, which is intended to adhere to a polymer incompatible with polyvinylidine fluoride (PVDF). The article comprises at least one layer of PVDF, at least one layer of PVDF rendered opaque to UV and visible radiation, and a composition for adhesion of the PVDF to an incompatible thermoplastic. The three-layer complex may be obtained by coextrusion. The three-layer complex is generally intended to form, with a PVDF-incompatible thermoplastic material, a novel 4-layer integral complex, either by coextrusion or by hot-pressing.

Abstract: The invention relates to an article containing at least three layers, which is intended to adhere to a polymer incompatible with polyvinylidine fluoride (PVDF). The article comprises at least one layer of PVDF, at least one layer of PVDF rendered opaque to UV and visible radiation, and a composition for adhesion of the PVDF to an incompatible thermoplastic. The three-layer complex may be obtained by coextrusion. The three-layer complex is generally intended to form, with a PVDF-incompatible thermoplastic material, a novel 4-layer integral complex, either by coextrusion or by hot-pressing.

Abstract: This invention relates to a flexible metal pipe covered with an impermeable sheath of a shrinkable, preferably semicrystalline polymer or polymers, characterized in that it incorporates between the shrinkable polymer sheath and the metal pipe an intermediate elastomer layer (8), optionally vulcanized or reticulated, and/or a TPE in the form of a continuous tubular sleeve (FIG. 3) or of a tape (FIG. 4 to 6). Sheathed pipes of this type are particularly suitable for flexible pipelines, optionally with suitable supports, for carrying oil and gas.

Abstract: This invention relates to a flexible metal pipe covered with an impermeable sheath of a shrinkable, preferably semicrystalline polymer or polymers, characterized in that it incorporates between the shrinkable polymer sheath and the metal pipe an intermediate elastomer layer (8), optionally vulcanized or reticulated, and/or a TPE in the form of a continuous tubular sleeve (FIG. 3) or of a tape (FIG. 4 to 6). Sheathed pipes of this type are particularly suitable for flexible pipelines, optionally with suitable supports, for carrying oil and gas.

Abstract: A polyamide-based tube for transporting a gasoline having resistance to permeability therethrough of the gasoline consisting essentially of an outer polyamide layer and an inner polyvinylidene fluoride layer bonded together by an adhesion binder.

Abstract: A composition is provided which is coextrudable with vinylidene polyfluoride permitting it to adhere to incompatible polymeric resins, the composition which has a base of an alkyl polymethacrylate and a thermoplastic polymer is comprised of:from 27 to 50 parts by weight of an alkyl polymethacrylate; andfrom 73 to 50 parts by weight of an additive itself constituted for 100 portions by weight of additive of:from 35 to 50 parts by weight of PVDF, andfrom 65 to 50 parts by weight of acrylic or methacrylic elastomer.This composition serves to produce vinylidene polyfluoride compounds capable of coating polymers which are non-compatible with vinylidene polyfluoride. When used as an adhesion agent, one can obtain by coextrusion, compounds of vinylidene polyfluoride and polymers non-compatible with the vinylidene polyfluoride.

Abstract: A composite material comprising a polyvinylidene fluoride layer, a substrate of a material that does not adhere to polyvinylidene fluoride, and an intermediate layer between said fluoride layer and substrate comprising a blend of polyvinylidene fluoride and a polymer containing carbonyl groups, ##STR1## in its polymer chain; the subject blend, and the process of treating a surface to adhere polyvinylidene fluoride thereto.

Abstract: A composition consisting essentially of a polyvinylidene fluoride polymer or copolymer having distributed substantially uniformly therethrough elastomeric particles, said elastomer being capable of absorbing hydrocarbons and fixing them in the composition and being present in an amount sufficient to increase the elongation and flexibility of the composition in the presence of hydrocarbons and shaped articles made therefrom.

Abstract: The present invention relates to laminates comprising a polyvinylidene fluoride resin layer, a thermoplastic resin layer, and an intermediate polyalkyl methacrylate layer and to the method of making such laminates, preferably by coextrusion.

Abstract: The process of forming a laminate by molding, preferably either by compression or injection molding, a polymer which is incompatible with PVF.sub.2 onto the surface of a preformed laminate sheet of a PVF.sub.2 and a polyalkyl methacrylate, with the preformed laminate have been previously obtained by the coextrusion of the PVF.sub.2 and polyalkyl methacrylate.

Abstract: The present invention relates to laminates comprising a polyvinylidene fluoride resin layer, a thermoplastic resin layer, and an intermediate polyalkyl methacrylate layer and to the method of making such laminates, preferably by coextrusion.

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.

Abstract: The present invention relates to a process for treating polyvinylidene fluoride surfaces to enhance adhesion of other polymers thereto comprising applying to at least one surface thereof a solution consisting essentially of a coating polymer selected from a polyurethane or an alkyl polymethacrylate and at least one aprotic polar solvent in which said polymer is soluble, and exposing said surface to a temperature of from about 100.degree. to 300.degree. C. for a time sufficient to evaporate said solvent.

Abstract: The present invention relates to a laminate comprising a polymethyl methacrylate layer having adheringly coated on at least one surface thereof a layer of polyvinylidene fluoride having a maximum thickness one-tenth the thickness of the polymethyl methacrylate layer; the total thickness of the polyvinylidene fluoride being no greater than about 400 microns. The invention also comprises the method of making such laminates.

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.

Abstract: The present invention provides a process for treating polyvinyl fluoride surfaces to enhance adhesion of other polymers thereto comprising applying to at least one surface thereof a solution consisting essentially of a coating polymer selected from a polyurethane or an alkyl polymethacrylate and at least one aprotic polar solvent in which said polymer is soluble, and exposing said surface to a temperature of from about 120.degree. C. to 230.degree. C. for a time sufficient to evaporate said solvent. The treated polyvinyl fluoride having an adhering intermediary surface of polyurethane or alkyl polymethacrylate usefully serves as a means to secure the polyvinyl fluoride to another polymer which otherwise would not adhere to polyvinyl.

Abstract: Process for coating flexible substrates which comprises applying a finishing polyurethane-polyurea elastomer coating to a release surface, applying an undercoat of a polyurethane-polyurea elastomer having a different composition than the finishing coating on the finishing coating and applying a flexible substrate to the undercoating.The polyurethane-polyurea elastomers used as the finishing coat are prepared by forming a polyether-polyol prepolymer in which the polyol consists essentially of a diol or a mixture of diols and which prepolymer is subsequently reacted with an aromatic diamine.The polyurethane-polyurea elastomers used to form the undercoat are obtained by reacting the aromatic diamine with a polyether-polyol prepolymer in which the polyol consists essentially of one having an hydroxyl functionality of at least 3 or a mixture of polyols in which at least one of the polyols has a hydroxy functionality greater than 2 in a sufficient amount to increase the resistance to flexing.