Process for producing molded products of propylene resin

A process for producing a molded product of propylene resin, which comprises melting and kneading at least a part of the following components (a) and/or (c), adding to the resulting melt the following component (b) or the component (b) and the remainder of the components (a) and/or (c) and kneading the resulting mixture to prepare a resin composition having a melt flow rate of 1 to 100 g/10 min, and then molding the resin composition into a molded product in which the breakage rate of the component (b) is 30% by weight or less:

• (a) 100 parts by weight of a crystalline propylene polymer at least partly modified with an unsaturated organic acid or its derivative, containing a propylene homopolymer moiety of a density of 0.9070 g/cm.sup.3 or more and having an overall melt flow rate of 1 to 300 g/10 min,
• (b) 3 to 100 parts by weight of coupling-treated glass balloons having a mean particle density (true density) of 0.1 to 0.8 g/cm.sup.3, as measured according to ASTM-D2840, a mean particle diameter of 7 to 100 .mu.m and a 10%-by-weight breakage pressure resistance of 150 kg/cm.sup.2 or more, as measured according to ASTM-D3102, and
• (c) 2 to 100 parts by weight of an elastomer either unmodified or at least partly modified with an unsaturated organic acid or its derivative.