To obtain a resin composition having improved dispersibility and decreased viscosity and giving a cured product having lowered dielectric constant and improved impact strength by compounding resin particles produced by polymerizing a cycloolefin and having a sphericity falling within a specific range into a resin component.
Resin particles produced by polymerizing a cycloolefin and having a sphericity (average) of 0.90-1.00, preferably 0.95-1.00, more preferably 0.98-1.00 are compounded to a resin component (thermoplastic resin or thermosetting resin, e.g. epoxy resin). The diameter (average) of the above resin particle is preferably ≤1 mm and the resin particle is preferably produced by polymerizing a metathesis polymerizable cycloolefin [e.g. bicyclic or polycyclic norbornenes, ≥4C monocyclic cycloolefin, etc., concretely a norbornene compound such as (substituted) norbornene, dicyclopentadiene and dihydtodicyclopentadiene] in the presence of a metathesis polymerization catalyst.
KAWAI HIROMASA
AOKI TOMOAKI
YAMAZAKI HITOSHI
