Patent ID: 6897258

Claim:
A compatibilizing agent for compatibilizing a radical polymerizable unsaturated resin with a polymer containing styrene as a principal component, said compatibilizing agent being a compound (D) obtained by reacting a polymeric compound (A), a polymeric compound (B), and a compound (C), characterized in that: the polymeric compound (A) is at least one polymeric compound which is a polymer containing polystyrene as a principal component, has within a molecule one or more functional groups capable of reacting with the compound (C), and has a number average molecular weight of 1,000 to 50,000; the polymeric compound (B) is at least one polymeric compound having within a molecule one or more functional groups capable of reacting with the compound (C), which is selected from polyester, polyether, and polycarbonate; and the compound (C) is a compound having within a molecule one or more functional groups capable of reacting with the functional group of the polymeric compound (A) and one or more polyfunctional groups capable of reacting with the functional group of the polymeric compound (B); wherein the total of the number of molecules of the polymeric compound (A) and the number of molecules of the polymeric compound (B) contained in a molecule of the compound (D) as a principal component of the compatibilizing agent is 3 or less; and wherein the number-average molecular weight of the compound (D) as a principal component of the compatibilizing agent is within a range of 1,000 to 60,000.