HIGH LATENCY CURING AGENTS FOR EPOXY RESINS Russian patent published in 2016 - IPC C08G59/46 C08K5/205 C08G18/00 C08L63/00 C08L75/00 

FIELD: chemistry.

SUBSTANCE: present invention relates to novel characterised by high latency liquid curing agents for hardening curable polymer resins. Disclosed is a liquid curing agent for curing curable polymer resins, particularly epoxy resins, involving: a) hydrogen; b) at least one urea derivative of formula (I) or formula (II), where R¹ and R² simultaneously or independently represent hydrogen, C₁-C₁₅ alkyl, C₃-C₁₅ cycloalkyl or together form a ring C₃-C₁₀ alkylene; R³ - hydrogen, C₁-C₁₅ alkyl, C₃-C₁₅ cycloalkyl, aryl, arylalkyl, -NHC(O)NR¹R²-substituted C₁-C₁₅ alkyl, -NHC(O)NR¹R²-substituted C₃-C₁₅ cycloalkyl, -NHC(O)NR¹R²-substituted aryl or -NHC(O)NR¹R²-substituted arylalkyl; R⁴, R⁵, R⁶, R⁷ and R⁸ simultaneously or independently represent hydrogen, halogen, C₁-C₁₅ alkyl, C₃-C₁₅ cycloalkyl, aryl, arylalkyl,-CF₃, -NHC(O)NR¹R², -NHC(O)NR¹R²-substituted C₁-C₁₅ alkyl, -NHC(O)NR¹R²-substituted aryl or -NHC(O)NR¹R²-substituted arylalkyl; and c) at least one stabiliser selected from a group comprising inorganic or organic acids. Invention also discloses an epoxy composition and polyurethane resins and composite material using said hardener and versions of using liquid hardener.

EFFECT: technical result is disclosed hardener has high latency and high reactivity at temperature of hardening.

12 cl, 8 tbl