Method for producing hollow structural body
AssigneeStella Chemifa Corporation
InventorsTerunori Yamaguchi, Shinji Hashiguchi, Mitsuo Ueno
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Abstract
It is intended to provide a method of producing a hollow construct, which may be in various shapes such as a fiber or a film as well as in various sizes and has chemical resistance, made of a fluorinated hydrocarbon polymer, a fluorinated carbon polymer or a polymer carrying a nitrogen-containing group, a silicon-containing group, an oxygen-containing group, a phosphorus-containing group or a sulfur-containing group having been introduced into the above-described polymer; and a hollow construct obtained by this method.
Claims6
A method for producing a fluorinated hollow structural body, said method of comprising the steps of;
- providing a non-hollow structural body made of a hydrocarbon polymer, wherein said non-hollow structural body is formed from an outer surface and a center portion, wherein said hydrocarbon polymer forms said outer surface and said center portion, and wherein said hydrocarbon polymer optionally has a nitrogen-containing group, a silicon-containing group, an oxygen-containing group, a phosphorus-containing group, or a sulfur-containing group;
- bringing said non-hollow structural body into contact with a treating gas containing fluorine under a predetermined processing condition to allow the treating gas to permeate the structural body from the outer surface toward the center portion and to fluorinate the structural body except for the center portion thereof;
- exposing the unfluorinated center portion after said fluorination treatment;
- and
- removing the exposed, unfluorinated center portion by dissolving or by the application of heat, thereby forming the fluorinated hollow structural body,
- wherein the removal step s conducted while heating at a temperature within a range from 50 to 400° C. under an inactive gas atmosphere.
Dependencies are inferred from the claim text.