Resin mixture, method of producing resin mixture, stretch blow molded product, and method of producing stretch blow molded product

A resin mixture, comprising:

• a binder resin;
• and
• carbon black dispersed in the binder resin,
• the binder resin containing a polyethylene terephthalate having an imide bond in its molecule and having a density of 1.3345 g/cm3 or less,
• wherein a stress when a test specimen is stretched five times at a temperature of 100° C. in accordance with Japanese Industrial Standard K7161-1:2014 is 2.0 MPa or more and 15.0 MPa or less,
• wherein the test specimen is prepared by making two notches in a central part of a non-stretched molded product at an angle of 45° from both directions, a length between deepest portions of the two notches being 2.00 mm, and
• wherein the non-stretched molded product is obtained by molding the resin mixture into a sample shape in accordance with Japanese Industrial Standard K7111-1:2012.