Browse Prior Art Database

High Temperature Resistant, Soluble Organic Dyes

IP.com Disclosure Number: IPCOM000112715D
Original Publication Date: 1994-Jun-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Afzali-Ardakani, A: AUTHOR [+2]

Abstract

Disclosed are the synthesis of thioxanthone-containing dyes which have very high temperature resistance and are soluble in polar oragnic solvents.

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High Temperature Resistant, Soluble Organic Dyes

      Disclosed are the synthesis of thioxanthone-containing dyes
which have very high temperature resistance and are soluble in polar
oragnic solvents.

      In the process of fabrication of thin film polyimide layers on
ceramic MCMs, photosensitive polyimides are used to define vias and
signal lines.  If photosensitive polyimide (PSPI)is directly coated
on the shiny ceramic module, significant portion of the UV light
which is used to expose PSPI is reflected from the shiny surface,
causing non-uniform lines to be developed.  In order to alleviate
this problem, a thin UV (500 nm) absorbing polyimide layer must first
be applied on the ceramic and then coated with PSPI.  Since the
polyimide (BPDA-PDA) which is used in this processes does not absorb
at this wavelength, a soluble organic dye which can resist high
temperature curing of the polyimide must be included in the polyamic
acid solution to make the cured film absorbant at the desired
wavelength.

      Thioxanthone dyes are well known organic dyes which have
unusally high temperature resistance but still do not withstand the
temperature (350-400ºC) which is required to cure polyimides.  We
have designed and synthesized a class of thioxanthone-imide dyes
which can be included in the polyamic acid solution and cured like
polyimides.  Thioxanthone anhydrides (1,2)( R=H, OCH3) is reacted
with diamines (3,4 and 5) which are ususally used in the preparation
...