申请人:——
公开号:US20030187121A1
公开(公告)日:2003-10-02
An automobile part comprising a polypropylene resin composition, the polypropylene resin composition comprising a propylene homopolymer (A1), an elastomer (B) and an inorganic filler (C), or comprising a propylene block copolymer (A2) and an inorganic filler (C) optionally together with an elastomer (B), in specified proportions. The propylene homopolymer (A1), or the propylene homopolymer segment of the propylene block copolymer (A2) exhibits an MFR (230° C.) of 20 to 300 g/10 min, a ratio of position irregular units derived from 2,1-insertion or 1,3-insertion of propylene monomer relative to all propylene structural units, determined from a
13
C-NMR spectrum, each of 0.2% or less, and an Mw/Mn, determined by GPC, of 1 to 3.
The present invention enables providing an automobile part (including an injection molded article) which has an excellent balance of rigidity and impact resistance, on which the possibility of flow marks is low and, even if flow marks occur, they are not conspicuous, and which realizes an excellent emboss transfer on molded article surface to thereby have an excellent appearance.
The polypropylene resin composition for use in the present invention has the above formulation, so that the time required for plasticization is short. Consequently, the molding cycle for producing an injection molded article can be shortened to thereby accomplish efficient production of an injection molded automobile part capable of realizing the above effects.
一种汽车零部件,包括聚丙烯树脂组合物,所述聚丙烯树脂组合物包括丙烯均聚物(A1),弹性体(B)和无机填料(C),或包括丙烯嵌段共聚物(A2)和无机填料(C),可选地与弹性体(B)一起,在指定的比例下混合。丙烯均聚物(A1)或丙烯嵌段共聚物(A2)的丙烯均聚物段具有MFR(230℃)为20至300g/10min,由13C-NMR光谱确定的源自2,1-插入或1,3-插入的丙烯单体的位置不规则单元与所有丙烯结构单元的比率均为0.2%或更少,并且由GPC确定的Mw/Mn为1至3。本发明能够提供一种汽车零部件(包括注塑成型品),其具有优异的刚度和抗冲击性的平衡,在其上流痕的可能性很低,即使出现流痕,它们也不明显,并且在成型品表面实现了优异的压花转移,从而具有优异的外观。本发明所用的聚丙烯树脂组合物具有上述配方,因此,塑化所需的时间很短。因此,用于生产注塑成型品的成型周期可以缩短,从而实现了能够实现上述效果的注塑汽车零部件的高效生产。