ApplicationNo. 05/546998 filed on 02/04/1975
US Classes:524/104, Five-membered nitrogen ring524/173, Sulfur directly bonded to oxygen and devoid of an aryl group, e.g., dimethyl sulfoxide, etc.524/210, N-C=X group wherein X is a chalcogen524/233, Dialkyl amides, e.g., dimethyl formamide, dimethyl acetamide, etc.524/234, Two or more N-C nitrogen nonreactant materials or with an organo oxygen or nitrogen-containing nonreactant material524/348, Two or more aryl-OH DNRM compounds524/84, Five-membered sulfur ring525/180, Polycarboxylic acid or derivative contains three or more carboxylic acid groups; or polyamine contains three or more amino groups; or from an amino containing polycarboxylic acid or derivative other than amine solely in salt form; or from polyamino carboxylic acid or derivative other than wherein amino groups are solely in salt form525/420, Solid polymer derived from an amino carboxylic acid or derivative; from a polyamine and a polycarboxylic acid or derivative; from at least one lactam; or from a polyamine salt of a polycarboxylic acid525/426Mixed with ethylenically unsaturated reactant or polymer therefrom
ExaminersPrimary: Lieberman, Allan M.
AbstractHigh solids, low viscosity, stable aqueous solutions of polyamide acids, which are precursors of polyimide polymers, can be prepared from the polyamide acids, a tertiary amine, a coalescing agent such as N-methylpyrrolidone, and a viscosity reducing agent such as furfuryl alcohol. These aqueous solutions are capable of depositing a uniform film and of being cured into polyimides.