Method of preparing polyamide acid type intermediates for proces

Details Method of preparing polyamide acid type intermediates for proces Method of preparing polyamide acid type intermediates for proces

1979-02-01

1980-09-30

Lee, Lester L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528125, 528126, 528128, 528172, 528179, 528182, 528183, 528184, 528188, 528223, 528224, 528226, 528229, 528351, 528352, 528480, 528482, C08G 7310

Patent

active

042257026

ABSTRACT:
A method of preparing a polyamide acid type intermediate is provided, by using a purified inert solvent and monomer compounds, or diamine and/or diaminoamide compounds and a tetracarboxylic acid dianhydride, whose ionic impurities and free acid contents were reduced by recrystallization purification. The polyamide acid type intermediate may improve electrical properties and heat resistance of semiconductors when it is applied to, for instance, a surface-protecting film of semiconductors or an interlayer-insulating film of semiconductors having a multiple layer wiring structure.

REFERENCES:
patent: 3179614 (1965-04-01), Edwards
patent: 3678005 (1972-07-01), Rabilbud et al.

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