公开(公告)号：US20160137831A1

公开(公告)日：2016-05-19

申请号：US14899763

申请日：2014-06-19

Applicant: JAPAN POLYPROPYLENE CORPORATION

Inventor： Tomohiro HOSOI ,  Shigeo MIZUKAMI ,  Masahiro NAGATA ,  Kouichi NAKAYAMA ,  Yuji RYOSHO

IPC: C08L53/00 ,  B29C45/00 ,  C08F299/02

CPC classification number: C08L53/00 ,  B29C45/0001 ,  B29K2023/14 ,  C08F297/083 ,  C08F299/022 ,  C08L23/142 ,  C08L2205/025 ,  C08L2205/06 ,  C08L23/14

Abstract: An object of the present invention is to prevent an occurrence of flow-mark molding defects to improve an appearance of molded articles, and as a means for achieving the object, a propylene-based block copolymer is used as an appearance improver, the copolymer comprising 80 to 60% by weight of crystalline propylene polymer portion which has an intrinsic viscosity [η]p of 0.90 dL/g or less and 20 to 40% by weight of propylene/ethylene random copolymer portion which has an ethylene content of 35 to 50% by weight and an intrinsic viscosity [η]c of 7.0 dL/g or higher ([η]c/[η]p being 7.5 to 30), in which the propylene-based block copolymer has a MFR of 10 to 50 g/10 min.

Abstract translation: 本发明的目的是为了防止流痕标注成型缺陷的发生，改善成型品的外观，作为实现该目的的手段，使用丙烯系嵌段共聚物作为外观改良剂，该共聚物包含 80〜60重量％的特性粘度[ηe]为0.90dL / g以下的结晶丙烯聚合物部分和20〜40重量％的丙烯/乙烯无规共聚物部分，其乙烯含量为35〜 50重量％，特性粘度[ηe]为7.0dL / g以上（[eegr] c / [eegr] p为7.5〜30），其中丙烯系嵌段共聚物的MFR为 10〜50g / 10min。