Polypropylene resin compositions, coating process for moldings thereof and its coated moldings

A polypropylene resin composition which comprises:

• (A) polypropylene,
• (B) an ethylene-propylene-diene terpolymeric rubber having a propylene content of 15.about.50% by weight, a Mooney Viscosity ML.sub.1+4 (100.degree. C.) of 20.about.60, an iodine value of 8.about.25 and a molecular weight distribution Mw/Mn of 1.5.about.4.0,
• (C) polycarbonatediol of formula (I),
• HO--(--R.sub.1 --O--CO--O--).sub.n R.sub.2 --OH (I)
• wherein R.sub.1 and R.sub.2 are an aliphatic hydrocarbon group and n is an integer of 1.about.20, and
• (D) an inorganic filler,
• a content of component (B) being 10.about.60% by weight based on the total weight of component (A)+(B), a content of component (C) being 0.5.about.10% by weight based on the total weight of components (A)+(B)+(C) and a content of component (D) being 0.about.40 parts by weight based on 100 parts by weight the total weight of components (A)+(B)+(C).