Patent ID: 7666930

Claim:
A method of producing a heat radiation shielding transparent resin form, comprising the steps of: (A) mixing and dispersing fine hexaboride particles having an average particle diameter of 200 nm or less represented by XB 6 wherein X is at least one selected from La, Ce, Pr, Nd, Gd, Tb, Dy, Ho, Y, Sm, Eu, Er, Tm, Yb, Lu, Sr and Ca, with a solvent by means of one dispersion method selected from the group consisting of a bead mill, a ball mill, a sand mill and ultrasonic dispersion to obtain a dispersion of the fine hexaboride particles; (B) drying the resulting dispersion of the fine hexaboride particles while removing the solvent therefrom to obtain a disperse powder of the fine hexaboride particles; (C) uniformly mixing the disperse powder of the fine hexaboride particles with a powder or pellets of a thermoplastic resin by means of a blender to obtain a mixture in which the fine hexaboride particles have uniformly been dispersed in the thermoplastic resin, and then melt-kneading and forming the mixture into pellets, thereby forming a master batch containing the hexaboride as a heat radiation shielding component; and (D) diluting and mixing the master batch containing a heat radiation shielding component with a thermoplastic-resin form material of the same type as the thermoplastic resin of the master batch or a different type of thermoplastic-resin form material having a compatibility with the master batch; and forming the resulting mixture; wherein the XB 6 is contained in the master batch in an amount of from 0.01 part by weight or more to less than 20 parts by weight based on 100 parts by weight of the thermoplastic resin.