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Browse Prior Art Database

Method of Producing Thin Polyimide Tubing

IP.com Disclosure Number: IPCOM000108903D
Original Publication Date: 1992-Jun-01
Included in the Prior Art Database: 2005-Mar-23
Document File: 1 page(s) / 32K

Publishing Venue

IBM

Related People

Feger, C: AUTHOR [+3]

Abstract

Disclosed is a method for producing polyimide tubing.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Method of Producing Thin Polyimide Tubing

      Disclosed is a method for producing polyimide tubing.

      The polyimide precursor, such as polyamic acid, can be
dissolved in a solvent like NMP and coated onto the surface of a
solid rod of another polymer which unzips to form a vapor at modest
temperatures.  Another way to coat the surface of a solid rod with
polyimide is to coat the two precursors of polyamic acid on the rod
from the vapor so that they react to form polyamic acid.  For
example, a length of PMMA can be extruded as a flexible string of
diameter, say, .010", and then coated with a .001" layer of PAA.
After drying the solvent from the film at 95~C, the PI film can be
imidized in less than 1 second at 400~C by passing the string through
an infrared or microwave furnace at reasonable speeds.  Then, after
the film has been imidized completely, the string can be passed at a
slower speed through a lower temperature furnace (<300~C for
example), where the inner polymer has time enough to unzip and where
the gases can escape the hollow end of the resulting tube.

      Disclosed anonymously.