PROBLEM TO BE SOLVED: To provide a plasticizer capable of adding thermoplasticity to cellulose acetate.;SOLUTION: The plasticizer for cellulose acetate included in a triangle area defined in the following includes a phosphoric ester compound having a 5% mass reduction temperature of 240°C or more. [Triangle area] the triangle area is surrounded by three straight lines of a straight line indicating a molecular weight of 200, a straight line defined by a formula (I) and a straight line defined by a formula (II) when a graph with a vertical axis as the SP value of the phosphoric ester compound and a horizontal axis as the molecular weight of the phosphoric ester compound is created. The formula (I) is SP=-9.38×FW×10-3+28.52 and the formula (II) is SP=9.38×FW×10-3+16.93.;COPYRIGHT: (C)2014,JPO&INPIT
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