PURPOSE: To suppress the generation of curling particularly with an environmental change and to improve the traveling property of the transfer paper in equipment and the image stability of toner images by controlling the characteristics of the electrophotographic transfer paper of a heat fixing type by a specific element.
CONSTITUTION: The ratio of the max. value and min. value of the microwave transmission intensity obtd. by a microwave measuring method for the transfer paper is confined to ≤1.60 and the initial contact angle θ of the paper surface to water is specified to 75°≤θ≤120° and further, the changing speed of the contact angle is confined to ≤0.5°/sec, by which the above-mentioned purposes are achieved.