| 摘要 |
PROBLEM TO BE SOLVED: To provide a propylene resin suitable for molding a molded product which is integrally molded with a skin material and has a good appearance, wherein the self-heat generation in the resin caused by shear stress at injection is reduced to decrease the damage on the skin material, and a preparation process of the molded product. SOLUTION: A propylene resin for injection molding is a propylene/ethylene block copolymer having a melt flow rate of 30 to 200 (g/10 min), wherein a propylene/ethylene copolymer rubber part accounts for fan 2 to 30 wt.% of the resin and has an intrinsic viscosity of 1 to 4 (dl/g) and a propylene content of 20 to 80 mol%, and a propylene homopolymer part accounts for 70 to 98 wt.% of the resin and has a melt flow rate of 50 to 400 (g/10 min) and a percentage of isotactic pentad of 95% or larger. The above-mentioned resin is injected into a mold with a mold clearance of 10 mm or smaller under a condition wherein the resin temperature is 170 to 230 deg.C and the injection time is 1 to 10 sec, and subsequently cooled for 5 sec or longer to prepare a molded product. A molded product which is integrally molded with a skin material is obtained by previously inserting a skin material inside the mold.
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