Question

Polymerizable monomers with low viscosity, their manufacture, curable compositions containing them, and polymer parts having them with good mechanical strength

Answer 1

The purpose of the invention is to provide a curable composition that yields a cured article having high tensile strength and high elongation. The curable composition of the invention is a polyurethane curable composition that uses as essential structural components a polyol (A) and a polyisocyanate (B), characterized by containing 1-150 parts by mass of polymer fine particles (C) having a core-shell structure having at least two layers (a core layer and a shell layer) relative to 100 total parts by mass of component (A) and component (B), by the glass transition temperature (Tg) of the core layer of component (C) calculated by numerical formula (1) below being higher than 0°C, and by the elongation at maximum tensile stress of a cured article formed from the curable composition being more than 47%. １／Ｔｇ＝Σ（Ｍｉ／Ｔｇｉ） （１） (In the formula, Ｍｉ represents the weight fraction of the non-crosslinkable monomer i component constituting the core layer of component (C), and Ｔｇｉ represents the glass transition temperature (K) of a homopolymer of the non-crosslinkable monomer i; i represents an integer of 1 or higher.)