Thermoplastic fluororesin tube
AssigneeGunze Limited
InventorsKazutaka Sekiya, Hiroshi Ohshima, Daiki Kobayashi, Masashi Kikuchi
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Abstract
There is provided a thermoplastic fluororesin tube that, during the production of a catheter, can prevent a gap or air bubbles from being formed in the connection part of the catheter, and can be suitably used for the production of a catheter. A thermoplastic fluororesin tube, the thermoplastic fluororesin tube having tearability in a longitudinal direction, wherein a thermal expansion coefficient in the longitudinal direction upon heating in a gaseous phase at a temperature of 100° C. for 5 minutes is 0% or more.
Claims6
A method for producing a thermoplastic fluororesin tube comprising a tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer (FEP), the thermoplastic fluororesin tube having tearability in a longitudinal direction, wherein a thermal expansion coefficient in the longitudinal direction upon heating in a gaseous phase at a temperature of 100° C. for 5 minutes is 0% or more, the method comprising the steps of:
- subjecting a thermoplastic fluororesin comprising a tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer (FEP) to melt extrusion molding to obtain a raw tube of the thermoplastic fluororesin tube;
- and
- expanding an inner diameter of the raw tube while heating the raw tube to a temperature of from 110-135° C.
Dependencies are inferred from the claim text.