To provide a propylene polymer which hardly gives a flow mark, exhibits a good weld appearance, hardly causes a sink (face strain) on the surface of a molded article, has excellent injection filling properties and can suppress development of fisheyes when it is contained in a polypropylene-based resin composition and subsequently being injection-molded, to provide the polypropylene-based resin composition containing the same polymer and to provide the injection-molded article.
The propylene polymer is composed of 51-75 wt.% of (A) a propylene-ethylene random copolymer component whose limiting viscosity [η]A measured in tetralin at 135°C is ≥5 dl/g and ethylene content is <8-20 wt.%, and 25-49 wt.% of (B) a propylene polymer component obtained by polymerizing monomers mainly constituted of propylene having ≤1.2 dl/g limiting viscosity [η]B measured in tetralin at 135°C. The polypropylene-based resin composition containing the same polymer and the injection-molded article thereof are also provided.
WAKAMATSU WAKE
| JPS5661417A | 1981-05-26 | |||
| JPH05194685A | 1993-08-03 | |||
| JPS63178112A | 1988-07-22 | |||
| JP2002332387A | 2002-11-22 | |||
| JPH07157626A | 1995-06-20 |
Toru Nakayama
Masayuki Enomoto
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