Patent ID: 6103864
Filing Date: 2000-08-15
Classification: C08G,Y10T

Abstract:
A stable monomeric solution of low-boiling organic solvents and a mixture of polyimide-forming monomers having an extended shelf-life at temperatures ranging up to about 80.degree. C. consisting essentially of:(a) at least one mono-alkyl ester-acid having the formula: ##STR9## wherein R.sub.2 is a lower secondary alkyl radical of 3 to 5 carbon atoms, and R.sub.1 is a divalent radical selected from the Group consisting of alkyl, substituted alkyl, aryl and substituted aryl radicals, and(b) at least one diester-diacid and isomers thereof having the formula selected from the Group consisting of: ##STR10## wherein R.sub.4 is a tetravalent aryl radical selected from the Group consisting of naphthalene, benzene and biphenyl radicals, R.sub.3 is a lower secondary alkyl radical of 3 to 5 carbon atoms, and X is a radical selected from the Group consisting of C.dbd.O, CF.sub.3 --C--CF.sub.3, CHOH, phenyl-C--CF.sub.3, CH.sub.2, CH.sub.3 --C--CH.sub.3, and --O--, and(c) at least one aromatic polyamine selected from the Group consisting of aromatic diamines, aromatic triamines, aromatic tetraamines and mixture thereof.