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AssigneeToho Catalyst Co., Ltd.
InventorsMotoki Hosoka, Hideo Tsukamoto, Hidetoshi Umebayashi, Makoto Nakano
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A propylene block copolymer with a high proportion of ethylene-propylene copolymer particles (rubber component) well dispersed in a propylene polymer exhibiting well-balanced rigidity and impact resistance can be obtained by using a solid catalyst for polymerization of olefins comprising (a) a solid catalyst component with controlled morphology, comprising magnesium, titanium, and a halogen atom, having an average particle diameter, specific surface area, and pore volume in a specific range, and having a pore size distribution in which an cumulative pore volume with a pore size of 100 Å or less is more than 50%, (b) an organoaluminum compound, and (c) an organosilicon compound. The block copolymer is very useful particularly for the application of vehicle parts such as a bumper and parts for household electric appliances.
A solid catalyst component for polymerization of olefins comprising magnesium, titanium, and a halogen atom, having an average particle diameter of 1 to 100 μm, a specific surface area of 100 to 500 m2/g, a pore volume of less than 0.3 ml/g, and a pore size distribution in which an cumulative pore volume with a pore diameter of 100 Å or less is more than 50%.
A propylene block copolymer comprising 20 to 80 wt % of a propylene polymer and 20 to 80 wt % of an ethylene-propylene copolymer, with the ethylene-propylene copolymer being dispersed in the propylene polymer as amorphous sections, wherein when the amorphous ethylene-propylene copolymer sections are converted into a circle with the same area, the circle has an average diameter (Dr) satisfying the following formula (2),
A propylene block copolymer comprising 20 to 80 wt % of a propylene polymer and 20 to 80 wt % of an ethylene-propylene copolymer, wherein the propylene polymer and ethylene-propylene copolymer are entangled with each other, forming amorphous propylene polymer sections and amorphous ethylene-propylene copolymer sections, wherein when the amorphous ethylene-propylene copolymer sections are converted into a circle with the same area, the circle has an average diameter (Dr) satisfying the following formula (2),
A propylene block copolymer comprising 20 to 80 wt % of a propylene polymer and 20 to 80 wt % of an ethylene-propylene copolymer, wherein the propylene block copolymer is in the form of particles with an average particle diameter of 100 to 5,000 μm and the proportion of the ethylene-propylene copolymer on the surface of the particles is 0.3 vol % or less of the total amount of the ethylene-propylene copolymer particles.
Dependencies are inferred from the claim text.