SUPER-BRANCHED POLYIMIDES AND 4,5-BIS-(3-AMINOPHENOXY)PHTHALIC ACID FOR THEIR PREPARING Russian patent published in 2005 - IPC

FIELD: organic chemistry, polymers, chemical technology.

SUBSTANCE: invention elates to a method for preparing super-branched polyimides based on new 4,5-bis-(3-aminophenoxy)phthalic acid. Super-branched polyimides comprise the following statistically links distributed in macromolecule: dendrite structure of the formula (I):

; links with linear structure of the formula (II):

, and terminal links of structure of the formula (III):

. Polyimides are prepared by the polycondensation reaction with simultaneous or the following cyclization reaction of 4,5-bis-(3-aminophenoxy)phthalic acid of the structural formula:

in melt of at least one aromatic monocarboxylic acid at temperature 110-180°C. Proposed polyimides can be used for the development of new polymeric materials compromising thermal stability with possibility for processing and the presence of assigned amount of functional groups able to polymer-analogous transformation. Invention provides expanding assortment of super-branched polyimides and to use a single-stage method also.

EFFECT: improved preparing method, valuable properties of polyimides.

5 cl, 7 ex