Multilayer tubing for chemical transfer applications
AssigneeSaint-Gobain Performance Plastics Corporation
InventorsJames Ludlow, Morgan D. Heskett, Mark F. Colton, Michael J. Tzivanis
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Abstract
Systems and methods are disclosed that include providing a multilayer tubing construction with an inner layer, an intermediate layer, and an outer or third layer formed from a material comprising a non-phthalate plasticizer, such as TOTM, DOA, DOTP, or combinations thereof. The multilayer tubing may be suitable for carrying a fuel, or other flammable substances therethrough, and resists delamination between layers when exposed to high humidity climates.
Claims18
A multilayer tubing construction, comprising:
- an inner layer;
- an intermediate layer comprising thermoplastic polyurethane (TPU), an ethylene acrylate copolymer, PVDF, THV, or a PVDF/THV copolymer;
- and
- a third layer formed from a polyvinyl chloride (PVC) material comprising a non-phthalate plasticizer, wherein the non-phthalate plasticizer comprises dioctyl terephthalate (DOTP), wherein thermoplastic polyurethane (TPU), an ethylene acrylate copolymer, PVDF, THV, or a PVDF/THV copolymer of the intermediate layer covers the inner layer around 360° of a circumference of the inner layer.
A method of forming a multilayer tubing construction, comprising:
- extruding an inner layer of a polyvinylidene difluoride (PVDF) polymer or copolymer;
- coextruding an intermediate layer of a thermoplastic polyurethane (TPU) over the inner layer, wherein the thermoplastic polyurethane (TPU) of the intermediate layer covers the inner layer around 360° of a circumference of the inner layer;
- and
- coextruding an third layer of a polyvinyl chloride (PVC) comprising a non-phthalate plasticizer over the intermediate layer, wherein the non-phthalate plasticizer comprises dioctyl terephthalate (DOTP).
Dependencies are inferred from the claim text.