Abstract: A pipe or liner for use in the oil and gas industry that comprises a melt-mixed bend of polyamide and incompatible polyolefin and a compatibilizing agent where the polyamide exists as a discontinuous phase that is dispersed in a polyolefin matrix. The pipe or liner has enhanced resistance to the permeation of hydrocarbons relative to polyethylene.

Abstract: Polymeric pipes with barrier layers are made by attaching to a pipe a multilayer structure which comprises a barrier layer and at least one irregularly surfaced sheet. The resulting pipes, which have reduced permeation to various substances, are useful for reducing loss of materials which are valuable, toxic and/or environmentally harmful.

Abstract: Pipes are provided wherein comprising polyamide compositions having good hydrolysis resistance and that may optionally contain plasticizer. Such pipes are suited for applications transporting hydrocarbons. The pipes of the present invention may be in the form of flexible pipes.

Abstract: Novel proppants useful in facilitating the hydraulic fracturing of subterranean formations are disclosed, made from filled polymers such as polyamides and polyesters. A process for the hydraulic fracturing of subterranean formations using filled polymeric proppants is disclosed.

Abstract: Marine umbilicals are provided comprising polyamide compositions having good hydrolysis resistance and that may optionally contain plasticizer.

Abstract: Polyamide compositions exhibiting superior hydrolysis resistance comprising copolyamide having a melting point that is less than or equal to about 240° C., at least about 30 ?eq/g of amine ends, and an inherent viscosity of at least about 1.2.

Abstract: Multilayered pipes comprising layers of functionalized melt-extrudable fluoropolymer, polyamide, and reinforcing fiber. Optional additional layers include melt-extrudable fluoropolymer and a thermoplastic polymer layer. The pipes are particularly useful in district heating applications.

Abstract: A pipe or liner for use in the oil and gas industry that comprises a melt-mixed bend of polyamide and incompatible polyolefin and a compatibilizing agent where the polyamide exists as a discontinuous phase that is dispersed in a polyolefin matrix. The pipe or liner has enhanced resistance to the permeation of hydrocarbons relative to polyethylene.

Abstract: The present invention relates to a pipe, especially an oil pipe, having a lining comprising a fluoropolymer adhered to its interior surface and a lining formed on its exterior surface. The interior and/or exterior lining may comprise a primer layer comprising a fluoropolymer, and preferably a perfluoropolymer and an overcoat or a preformed film adhered to the primer layer. Either the overcoat or the preformed liner also comprises a fluoropolymer, and preferably a perfluoropolymer. The surface of the lining facing the flowable media, such as oil, may be a pure perfluoropolymer to provide a particularly good non-stick surface for the oil.

Abstract: The present invention relates to pipes that convey any flowable medium, such as chemicals, food and in particular, oil and gas, and more particularly to a system of pipes having different coatings or linings for the interior and exterior surfaces of such pipes, depending on the environment in which the pipes are used. The pipes may be coated with different materials, which may be of different thicknesses, with various configurations of coatings or linings. Such coating may be done on the interior and/or the exterior of the pipes.

Abstract: Marine umbilicals are provided comprising polyamide compositions having good hydrolysis resistance and that may optionally contain plasticizer.

Abstract: Polyamide compositions exhibiting superior hydrolysis resistance and pipes and other articles made therefrom are disclosed.

Abstract: Multilayered pipes are provided wherein at least one layer comprises polyamide compositions having good hydrolysis resistance and that may optionally contain plasticizer. Such pipes are suited for applications transporting hydrocarbons. The pipes of the present invention may be in the form of flexible pipes.

Abstract: A pipe that comprises a melt-mixed bend of vinyl alcohol polymer and incompatible polyolefin and a compatibilizing agent where the vinyl alcohol polymer exists as a discontinuous phase that is dispersed in a polyolefin matrix. The pipe has enhanced resistance to the permeation of hydrocarbons and hydrocarbon/alcohol mixtures relative to polyethylene.

Abstract: A pipe or liner for use in the oil and gas industry that comprises a melt-mixed bend of polyamide and grafted fluoropolymer having polar functionality where the grafted fluoropolymer having polar functionality exists as a discontinuous phase that is dispersed in a polyamide matrix. The pipe or liner has enhanced resistance to the permeation of hydrocarbons relative to polyethylene. A further embodiment is fuel lines that comprise a melt-mixed bland of polyamide and a grafted fluoropolymer having polar functionality.

Abstract: A process for producing plasticized polyamide blends containing additives such as tougheners, reinforcing agents, and/or filler. High average molecular weight plasticized blends containing additives may be made using the process of the invention. Pipes and tubing may be made from the blends prepared using the process of the invention.