MULTIFUNCTIONAL BENZOXASINES AND COMPOSITE MATERIALS INCLUDING SPECIFIC COMPOUNDINGS Russian patent published in 2018 - IPC C08G73/06 C07D265/16 C08K5/35 

FIELD: chemistry.

SUBSTANCE: invention relates to variants of a curable resin composition and to a composite material obtained from the curable resin composition. Curable resin composition contains more than 80 % by weight of a mixture of benzoxazines comprising a bifunctional benzoxazine component (A) and a multifunctional benzoxazine component (B) with an average functionality more than 2. Amount of component (B) is up to 30 % by weight relative to the total weight of the benzoxazine mixture in the composition. In the first variant, component (B) is a trifunctional benzoxazine having the following structure I:

,

where R₁, R₂ and R₃ are independently selected from alkyl, cycloalkyl and aryl, the cycloalkyl and aryl groups being optionally substituted, and, if substituted, one or more substituent groups may be present in each cycloalkyl and aryl group; and R₄ is selected from hydrogen, halogen, alkyl and alkenyl. In the second variant, the component (B) is the reaction product of a triatomic phenol, an aromatic amine and formaldehyde. Triatomic phenol has the following structure:

.

Composite material is obtained by wetting or tinging the reinforcing fibers with the above mentioned composition.

EFFECT: invention makes it possible to obtain composite materials that exhibit a significant slowing down of the absorption of the organic solvent.

19 cl, 4 dwg, 3 ex, 4 tbl