Abstract: A process for preparing a half-vanadocene compound, the process comprising reacting chlorine gas with a vanadocene compound represented by the formula (1) Cp2VX2??(1) wherein Cp represents cyclopentadienyl, substituted cyclopentadienyl, indenyl, substituted indenyl, fluorenyl, substituted fluorenyl, benzoindenyl, substituted benzoindenyl, azulenyl or substituted azulenyl, and the two Cp groups may be the same or different, X represents fluorine, chlorine, bromine or iodine and the two X atoms may be the same or different.

Abstract: A process for preparing a half-vanadocene compound, the process comprising reacting chlorine gas with a vanadocene compound represented by the formula (1)

Abstract: Novel silane compound, alkoxy cyclopentyl diethoxysilane, is prepared by reacting cyclopentyl trihalosilane with ROH and then with ethanol, or by reacting cyclopentyl triethoxysilane with ROH, wherein alkyl in the alkoxy or R in ROH stands for an organic group selected from tile group consisting of isopropyl, sec-butyl, tert-buryl and tert-amyl groups. The silane compounds are useful as a catalytic component for olefin polymerization and as a silane coupling agent.

Abstract: Novel silane compound, alkoxy cyclopentyl dimethoxysilane, is prepared by reacting cyclopentyl trihalosilane with ROH and then with methanol, or by reacting cyclopentyl trimethoxysilane with ROH, wherein alkyl in the alkoxy or R in ROH stands for an organic group selected from the group consisting of sec-butyl, tert-amyl, cyclopentyl, oxa-3-cyclopentyl, cyclohexyl and 2-isopropyl-5-methyl cyclohexyl groups. The silane compounds are useful as a catalytic component for olefin polymerization and as a silane coupling agent.

Abstract: Hot melt adhesives containing petroleum resin tackifiers which are prepared by a process wherein (1) a C.sub.8 -- and/or C.sub.9 aromatic unsaturated hydrocarbon-containing feed (optionally containing up to 18 wt. % of C.sub.4 or C.sub.5 unsaturated aliphatic hydrocarbons) is first polymerized completely and thereafter a C.sub.5 -aliphatic unsaturated hydrocarbon-containing feed is added, polymerization continued and the reactor effluent stripped to obtain the resin. The order of polymerization may be reversed.

Abstract: A catalyst for olefin polymerization which comprises: (A) a catalyst component obtained by reacting (a) pentadiene or a derivative thereof with (b) an alkali metal and subsequently reacting the reaction product with (c) a titanium compound or zirconium compound, and (B) aluminoxane.

Abstract: A catalyst for olefin polymerization which comprises: (A) a catalyst component obtained by reacting (a) pentadiene or a derivative thereof with (b) an alkali metal and susequently reacting the reaction product with (c) a titanium compound or zirconium compound, and (B) aluminoxane.

Abstract: A catalyst for olefin polymerization which comprises:(A) a catalyst component obtained by reacting (a) alkali metal boron hydride represented by the formula MBH.sub.4 (where M denotes an alkali metal) with (b) pyrazole and subsequently reacting the reaction product with (c) a titanium compound or zirconium compound, and(B) aluminoxane.

Abstract: Petroleum Resins particularly effective for use as tackifiers for hot melt adhesives and in tackifiers for solvent-based pressure sensitive adhesives are prepared by a processWherein (1) a C.sub.8 - and/or C.sub.9 aromatic unsaturated hydrocarbon-containing feed (optionally containing up to 18 wt. % or C.sub.4 or C.sub.5 unsaturated aliphatic hydrocarbons) is first polymerized completely and thereafter a C.sub.5 -aliphatic unsaturated hydrocarbon-containing feed is added, polymerization continued and the reactor effluent stripped to obtain the resin. The order of polymerization may be reversed.

Abstract: Petroleum Resins particularly effective for use as tackifiers for hot melt adhesives and in tackifiers for solvent-based pressure sensitive adhesives are prepared by a processWherein (1) a C.sub.8 - and/or C.sub.9 aromatic unsaturated hydrocarbon-containing feed (optionally containing up to 18 wt. % or C.sub.4 or C.sub.5 unsaturated aliphatic hydrocarbons) is first polymerized completely and thereafter a C.sub.5 -aliphatic unsaturated hydrocarbon-containing feed is added, polymerization continued and the reactor effluent stripped to obtain the resin. The order of polymerization may be reversed.

Abstract: A catalyst component for polymerization of olefins which is prepared by bringing a magnesium alkoxide, a halogenated hydrocarbon, and a titanium compound into contact with one another. The catalyst component together with a organoaluminum cocatalyst is used for the polymerization of olefins and especially for the homopolymerization of ethylene and copolymerization of ethylene with an .alpha.-olefin having from 3 to 10 carbon atoms.