PURPOSE: To obtain the titled composition giving a light-weight molded article having excellent mechanical strength such as bending strength, impact strength, etc., by compounding fine powder of cured thermosetting resin to an unsaturated polyester resin composition for molding use containing inorganic microballoon filler.
CONSTITUTION: The objective composition is prepared by compounding (A) an unsaturated polyester resin, (B) inorganic microballoon filler, (C) fine powder of a thermosetting resin (e.g. benzoguanamine resin or melamine resin powder having particle size of 2W3μ), and preferably (D) an inorganic filler, (E) a curing agent (e.g. benzoyl peroxide) and (F) a fiber reinforcing agent (e.g. glass fiber). Preferably, the amount of (B)+(C)+(D)+(E) is 120W250pts.wt. per 100pts.wt. of the component (A), and those of the component (C) and components (E)+(E) are 1/6W5 and 1/2W9 per 1pt. of the component (B), respectively.
YAMAMOTO YOSHIHIRO
NAKAMURA KOUICHI
