Toughness enhancer and resin composition containing toughness enhancer

Abstract

This invention provides a toughness enhancer that does not adversely affect the viscosity of the slurry, maintains strength even when the preform is film-formed, or can improve the elongation of the preform while improving strength. The toughness enhancer of this invention comprises a polymer that includes structural units from a polyoxyalkylene compound represented by component (a): formula (1) R1O(AO)mR2 (in formula (1), R1 represents a hydrocarbon group with 1 to 18 carbon atoms, R2 represents an unsaturated hydrocarbon group with 2 to 5 carbon atoms, or (meth)acrylyl, and m is the average addition mole number of the oxyalkylene group and represents 1 to 100), and structural units from component (b): maleic acid compounds.