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Stabilization of Polyamic Acid (PMDA DADPE) Through Mixed Solvents

IP.com Disclosure Number: IPCOM000089590D
Original Publication Date: 1977-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Duran, J: AUTHOR

Abstract

Presently available commercial polyamic acid is formed by mixing (a) pyromellitic dianhydride (PMDA) with (b) a solution of 1-methyl-2-pyrrolidone (NMP) containing diamino diphenyl ether (DADPE). However, the NMP causes the PMDA to be unstable.

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Stabilization of Polyamic Acid (PMDA DADPE) Through Mixed Solvents

Presently available commercial polyamic acid is formed by mixing (a) pyromellitic dianhydride (PMDA) with (b) a solution of 1-methyl-2-pyrrolidone (NMP) containing diamino diphenyl ether (DADPE). However, the NMP causes the PMDA to be unstable.

An improved polyamic acid formulation having superior stability characteristics is formed by mixing (a) a solution of dimethyl sulfoxide (DMSO) containing PMDA with (b) a solution of NMP containing DADPE. The presence of the solvent DMSO inhibits the degradation of PMDA caused by the NMP.

Solvents other than DMSO may be useful in inhibiting the degradation of PMDA. Similarly, the use of solvents in the manner described above may be applied to other unstable chemical systems.

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