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AssigneeE. I. Du Pont de Nemours and Company
InventorsRichard C. Albert, Craig King Hennessey, Laurence Waino McKeen, Jurgen F. A. Hofmans, Raf Moens
Estimating the term…
Pipe useful for downhole and transport of hydrocarbon fuel such as oil and/or natural gas is provided that has a non-stick coating adhered to the pipe interior surface, said coating being at least about 50 μm thick and comprising at least two layers constituting an inner layer and an outer layer adhered to one another, each said layers containing polymer binder and fluoropolymer and being at least about 15 μm thick, the weight proportion of said polymer binder to said fluoropolymer in said inner layer and in said outer layer but being effective to maintain adhesion between said layers during pressurization and decompression upon said non-stick coating being exposed to the Autoclave Test and the proportion of said fluoropolymer in said inner layer and said outer layer being effective to protect said interior surface during exposure of said non-stick coating to the Acid Soak Test.
Pipe having a non-stick coating adhered to its interior surface, said coating being at least about 50 μm thick and comprising at least two layers constituting an inner layer and an outer layer adhered to one another, each said layers containing polymer binder and fluoropolymer and each being at least about 15 μm thick, wherein the weight ratio of said polymer binder to said fluoropolymer in said inner layer is from about 80:20 to about 25:75 and in said outer layer is from about 60:40 to about 15:85 and being effective to enable said non-stick coating to pass both the Autoclave Test and the Acid Soak Test, Level 1.
Pipe having a non-stick coating adhered to its interior surface, said coating being at least about 50 μm thick and comprising at least two layers constituting an inner layer and an outer layer adhered to one another, each said layers containing polymer binder and fluoropolymner and being at least about 15 μm thick, the weight ratio of said polymer binder to said fluoropolymer in said inner layer being greater than the weight ratio of said polymer binder to said fluoropolymner in said outer layer and being effective to enable said non-stick coating to pass both the Autoclave Test and the Acid Soak Test, Level 1.
Process for forming a non-stick coating adhered to the interior surface of pipe that is capable of passing both the Autoclave Test and the Acid Soak Test, Level 1, comprising:
Dependencies are inferred from the claim text.