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| EPDM, HNBR and Butyl rubber compositions containing carbon black products |
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| Carbon black products for coloring mineral binders |
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| Compositions of modified carbon products and amphiphilic ions and methods of using the same |
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| Process for crosslinking |
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Molded product of a polypropylene resin
| Details |
Inventors: Koizumi, Junji; Takeuchi, Junji;
Assignee: Toyoda Goesi Co., Ltd. (Nishikasugai-gun, JP)
Primary Examiner: Bleutoe; John C.
Assistant Examiner: Delaney; Patrick R.
Attorney, Agent or Firm: Cushman, Darby & Cushman IP Group of Pillsbury Madison & Sutro LLP
The invention relates to a molded product containing 65 to 95% by weight of a polymer composition and 5 to 35% by weight of an inorganic filler. The polymer composition is a mixture of 45 to 70 parts by weight of a polypropylene resin having a melt flow rare of 10 to 60 g/10 minute and containing 0 to 8% by weight of ethylene, and 30 to 55 parts by weight of an amorphous ethylene-.alpha.-olefin copolymer. The proportion (D) of the filler and that (C) of the copolymer have the relation expressed as D>155-37 lnC. The copolymer is a mixture of 30 to 60% by weight of a high-molecular copolymer having a weight-average molecular weight of 380,000 to 1,000,000 and 40 to 70% by weight of a low-molecular one having weight-average molecular weight of 150,000 to 330,000. The product has a coefficient of linear expansion not exceeding 5.0.times.10.sup.-5 cm/cm/.degree.C. |
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DETAILED DESCRIPTION Under these circumstances, it is an object of this invention to provide a molded product of a polypropylene resin which has excellent dimensional stability and releasibility from a mold after injection molding, and is formed from a material of high moldability.
This object is attained by a molded product formed from a material comprising 65 to 95% by weight of a polymer composition, which composition comprises 45 to 70 parts by weight of a polypropylene resin having a melt flow rate (X) of 10 to 60 g/10 minutes and containing 0 to 8% by weight of ethylene, and also containing 30 to 55 parts by weight of an amorphous ethylene-.
alpha.
-olefin copolymer (EO copolymer), and 5 to 35% by weight of an inorganic filler, the proportion (C) of the EO copolymer and the proportion (D) of the filler having the relation expressed as D>155-37 lnC.
The EO copolymer comprises 30 to 60% by weight of a high-molecular EO copolymer having a weight-average molecular weight of 380,000 to 1,000,000 and 40 to 70% by weight of a low-molecular EO copolymer having a weight-average molecular weight of 150,000 to 330,000.
The product has a coefficient of linear.
expansion not exceeding 5.
times.
10.
sup.
-5 cm/cm/.
degree.
C.
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Adhesives and Rubbers 
