Tubing and Process for Production Thereof
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United States of America Patent
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Issued Date -
Jun 26, 2008
app pub date -
Feb 20, 2006
filing date -
Feb 21, 2005
priority date (Note) -
Abandoned
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Abstract
A tubular article (31) is provided by molding and thermosetting a mixture including polyimide and fluororesin particles. At least a part of the fluororesin particles present in the vicinity of a surface layer of the tubular article (31) is melt-flowed into the outer face or both faces of the tubular article and oozes out so as to form a fluororesin coating partially or entirely. The tubular article (31) can be manufactured by applying on the outer face of a mold a dispersion prepared by adding fluororesin particles to a polyimide precursor solution and casting to have a predetermined thickness, heating for imidization so that the maximum temperature for the imidization is set higher than the melting point of the fluororesin, cooling and subsequently separating the tubular article from the mold. The present invention provides a tubular article with low dynamic friction coefficient particularly for the outer face, with high durability and that can be manufactured at low cost, and a method of manufacturing the tubular article.
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