Browse Prior Art Database

Solventless Films of Polyamic Acid by Coevaporation of BTDA-ODA

IP.com Disclosure Number: IPCOM000103519D
Original Publication Date: 1990-Dec-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 1 page(s) / 35K

Publishing Venue

IBM

Related People

Brady, MJ: AUTHOR [+5]

Abstract

Thermoplastic polyamic acid can be prepared through the solventless coevaporation of monomeric starting materials, where the starting materials are BTDA and ODA. These materials are the following: BTDA: 3,3',4,4' Benzophenone tetracarboxylic dianhydride. ODA: Oxydianaline / 4-Aminophenyl ether / Diamino diphenyl ether.

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

Solventless Films of Polyamic Acid by Coevaporation of BTDA-ODA

      Thermoplastic polyamic acid can be prepared through the
solventless coevaporation of monomeric starting materials, where the
starting materials are BTDA and ODA.  These materials are the
following:
   BTDA: 3,3',4,4' Benzophenone tetracarboxylic dianhydride.
   ODA: Oxydianaline / 4-Aminophenyl ether / Diamino diphenyl ether.

      The starting materials are ultrapure powders of BTDA and ODA.
These materials are placed in a vacuum vessel below the sample
substrate.  The apparatus is then evacuated to a pressure of about
10-6torr.  The starting materials are then heated to a temperature at
which the sublimation begins.  Film deposition can be noted by
observing the refraction rings which are due to the thin deposited
polymer layer.

      Being thermoplastic, the BTDA-ODA polymer flows above 350oC and
cross-links upon further heating, providing improved planarization
properties.  Films with this polymer were heated to 400oC and were
not attacked by polar solvents.  The precursors BTDA and ODA are
commercially available in a purified state.  The polyimide film
produced by imidization shows excellent adhesion to glass.

      Disclosed anonymously.