PURPOSE: To manufacture raw material chips not fusing to machine walls by setting a multiple fusing peak temperature measured by DSC in a specific range, and allowing the heat absorption amount to be a specific value or more in isophthalic acid copolymcrlc polyester chips.
CONSTITUTION: Isophthalic acid copolymeric polyestar chips are determined to be in the range of 100-160°C in its Tm' measured by DSC and 0.1cal/g or more in its heat absorption amount. Herein, Tm' is a multiple fusing peak temperature generated at the side of lower temperature than Tm. In its crystallization, the dry machine wall temperature during chip supply in an atmosphere of gas is a glass-transition temperature of the chips prior to crystallization or lower and raised to the temperature in 10-40min in temperature a formula described below. Herein. the formula is made 3.4M+66.5<T<3.4M+96.5, and M denotes an isophthalic acid copolymeric rate (mol%). In this manner, raw material chips for metal plating film can be obtained which have no fusion to machine walls, and also have no risk of causing coloring and deterioration.
SHIMIZU YUZO
HIRAYAMA TAKASHI
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