Browse Prior Art Database

Annealing of Polyimide Films

IP.com Disclosure Number: IPCOM000039841D
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Schuessler, PW: AUTHOR

Abstract

Annealing polymide films from 400oC to room temperature over a 12-hour period allows molecular rearrangements to form such that lower moisture solubility constants can be achieved for more densely packed polyimide. This profile allows for molecular chains to properly imidize and drive off residual solvent (NM2P) and water of condensation. The standard process has been to remove these parts to atmosphere after cure. It has been found that prolonging the cool-down time from minutes to hours, i.e., affecting an annealing process, sufficient time at temperature allows for an apparent "rearrangement" of polymide molecules to occur. This is akin to the quench and anneal processes for metals. The net change in molecular configuration is manifested by the moisture solubility constant for the polyimide.

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Annealing of Polyimide Films

Annealing polymide films from 400oC to room temperature over a 12-hour period allows molecular rearrangements to form such that lower moisture solubility constants can be achieved for more densely packed polyimide. This profile allows for molecular chains to properly imidize and drive off residual solvent (NM2P) and water of condensation. The standard process has been to remove these parts to atmosphere after cure. It has been found that prolonging the cool-down time from minutes to hours, i.e., affecting an annealing process, sufficient time at temperature allows for an apparent "rearrangement" of polymide molecules to occur. This is akin to the quench and anneal processes for metals. The net change in molecular configuration is manifested by the moisture solubility constant for the polyimide. Data generated via a McBain Balance at 35oC 100% at 0% RH (relative humidity) shows that "annealed" polyimide will only take-on up to 2.2 +.3% water while the unannealed will _ take-on up to 5.0 + .3%.

_ Thus, annealing polymides will prevent larger amounts of moisture from being retained and will allow for shorter drying periods when an operation is oriented towards producing "dry" packages. The cure profile is depicted in the drawing.

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