摘要:
Described herein are propylene waxes and a production process thereof. The waxes are each produced by polymerizing propylene in a reaction vessel while using a solid catalyst in the presence or absence of an organoaluminum compound. A hydrogen partial pressure of a gas phase in the reaction vessel, said gas phase being formed of the propylene and hydrogen, is maintained at 10% or higher. The solid catalyst is formed of a transition metal compound or a reaction product between the transition metal compound and an organometallic compound, an aluminoxane and a fine particulate carrier. Also described herein is a heating-roll fixing type toner composition composed essentially of a binder resin or a binder resin composition, a colorant and, as a releasing agent, the wax.
摘要:
Described is a film forming method for a polypropylene resin composition, which comprises subjecting a polypropylene resin composition composed of 5 to 95 parts by weight of a syndiotactic polypropylene and 95 to 5 parts by weight of an isotactic polypropylene to air-cooled tubular film extrusion. By the air-cooled method which has heretofore had difficulty in obtaining a highly-transparent film from conventional isotactic polypropylene, a film having excellent transparency can be obtained.
摘要:
A method for preparing an ethylene copolymer which comprises the step of copolymerizing ethylene with an aromatic vinyl compound in the presence of a catalyst comprising (A) a specific transition metal compound represented by the formula I and (B) a cocatalyst such as an aluminoxane.
摘要:
A method for preparing a propylene (co)polymer having a substantially high syndiotactic structure and a desired molecular weight which comprises the step of (co)polymerizing propylene or propylene and a small amount of another olefin by the use of a transition metal compound catalyst having asymmetric ligands in the presence of a specific internal olefin.
摘要:
Described is a film forming method for a polypropylene resin composition, which comprises subjecting a polypropylene resin composition composed of 5 to 95 parts by weight of a syndiotactic polypropylene and 95 to 5 parts by weight of an isotactic polypropylene to air-cooled tubular film extrusion. By the air-cooled method which has heretofore had difficulty in obtaining a highly-transparent film from conventional isotactic polypropylene, a film having excellent transparency can be obtained.
摘要:
A method for preparing an ethylene copolymer which comprises the step of copolymerizing ethylene with an aromatic vinyl compound in the presence of a catalyst comprising (A) a specific transition metal compound represented by the formula I and (B) a cocatalyst such as an aluminoxane.