Flame retardant, high precision resin mechanical part for use in an office automation machine

A flame retardant, high precision resin mechanical part for use in office automation machines required to function with high accuracy and high precision, which is made by injection molding a thermoplastic resin composition comprising:

• (A) 100 parts by weight of an amorphous thermoplastic resin;
• (B) 5 to 1 50 parts by weight of an inorganic filler in a flake form, which is comprised of at least one filler selected from the group consisting of glass flakes and mica flakes,
• wherein said glass flakes have a weight average major diameter of 1,000 .mu.m or less and a weight average aspect ratio of 5 or more and said mica flakes have a weight average diameter of 1,000 .mu.m or less and a weight average aspect ratio of 10 or more;
• and
• (C) 3 to 50 parts by weight of a phosphoric acid ester represented by the following formula (I):
• ##STR14## wherein each of Q.sup.1, Q.sup.2, Q.sup.3 and Q.sup.4 independently represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms;
• each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently represents a methyl group or a hydrogen atom;
• n represents an integer of 1 or more;
• each of n1 and n2 independently represents an integer of from 0 to 2;
• and each of m1, m2, m3 and m4 independently represents an integer of from 1 to 3.