CURABLE BENZOXAZINE COMPOSITIONS Russian patent published in 2021 - IPC C08G59/40 C08G73/10 C08L79/08 C08L63/00 C08J5/24 

FIELD: prepreg manufacturing.

SUBSTANCE: present invention relates to a curable composition for the manufacture of composite materials and coatings, a method for its preparation, a cured finished product and a method for producing a prepreg or a bundle prepreg. The curable composition includes (a) bisphenol-A-benzoxazine resin, (b) the active diluent-3,4-epoxycyclohexylmethyl-3,4' - epoxycyclohexanecarboxylate, and (c) a soluble polyimide obtained by reacting 5(6) - amino-1 (4' - aminophenyl) - 1,1,3-trimethylindane with benzophenontetracarboxylic acid dianhydride. The method for preparing the curable composition includes (a) mixing the specified soluble polyimide with the specified active diluent and optional additives to obtain a homogeneous solution or dispersion, followed by mixing bisphenol-A-benzoxazine resin with this solution or dispersion.

EFFECT: obtained curable composition, after curing, results in a finished product with well-balanced thermal, chemical, and mechanical properties, which can be useful in various industries such as aerospace, electronics, and automotive ones.

8 cl, 2 tbl, 2 ex