| abstract |
PROBLEM TO BE SOLVED: To sharply color a crystalline resin (with or without fiber reinforcement), and particularly to have excellent fluidity during molding of the colored crystalline resin and excellent molding accuracy, The appearance and surface shape of the molded product, such as the surface glossiness, are satisfactorily improved. Also, the crystallization temperature of the crystalline resin is lowered, the fluidity is improved, And improve the surface glossiness. SOLUTION: Nigrosine is treated with sulfuric acid and / or phosphoric acid to obtain a water-insoluble nigrosine compound which is a salt of nigrosine with sulfuric acid and / or phosphoric acid. The nigrosine compound is contained in a crystalline resin. |