Composition for curable resin, cured product of said composition, production method for said composition and said cured product, and semiconductor device

A method of producing a curable resin composition, the method comprising the steps of:

• mixing
• (A) a multifunctional benzoxazine compound having at least two benzoxazine rings, the compound being at least one multifunctional benzoxazine compound selected from a multifunctional benzoxazine compound having a structural unit of formula (1) and a multifunctional benzoxazine compound represented by a structure of formula (2),
• (B) a multifunctional epoxy compound having at least one norbornane structure and at least two epoxy groups,
• (C) a curing agent, and
• (D) a curing accelerator which is a bisphenol salt of a diazabicycloalkene,
• to obtain a mixture;
• and
• processing the mixture into a powdery, pelletized, or granular curable resin composition;
• wherein in the formula (1), R represents a linear alkyl group having 1 to 12 carbon atoms, a cyclic alkyl group having 3 to 8 carbon atoms, or an aryl group having 6 to 14 carbon atoms, where the aryl group optionally has halogen or a linear alkyl group having 1 to 12 carbon atoms, as a substituent;
• and each Z represents hydrogen, a hydrocarbon group having 1 to 8 carbon atoms and/or a linking group and is optionally the same or different, at least one Z represents a linking group, and benzoxazine rings are linked by the linking group;
• wherein in the formula (2), L represents a divalent organic group having 1 to 5 aromatic rings or an alkylene group having 1 to 10 carbon atoms, and the organic group and the alkylene group optionally comprise oxygen and/or sulfur.