Abstract: A process for the production of polyolefins is disclosed, which is carried out in the presence of catalysts prepared according to the invention. The catalysts comprise a carrier resulting from the reaction of anhydrous magnesium halide, silicon tetrachloride and a compound represented by the general formulaROHwhere R is a hydrocarbon group of 1 to 20 carbon atoms, and a transition metal compound supported on said carrier. Such catalysts are activated by an organometal compound of a metal of the Groups I to IV of the Periodic Table when in use.

Abstract: A process for preparing dihydric phenol derivatives by oxidizing monohydric phenol derivatives with hydrogen peroxide in the presence of a ketone. This reaction can be promoted in the presence of sulfuric acid or a salt thereof or a sulfonic acid or a salt thereof.

Abstract: According to the present invention, there is provided a process for preparing polyolefins which comprises polymerizing or copolymerizing olefins using as catalyst a component consisting of a solid carrier and a titanium compound and/or a vanadium compound supported thereon, and an organometallic compound, said solid carrier consisting of a product obtained by mixing and heating an aluminum oxide and an ammonium sulfate.

Abstract: A process for preparing dihydric phenol derivatives by oxidizing monohydric phenol derivatives with a ketone peroxide in the presence or absence of sulfuric acid or a salt thereof or a sulfonic acid or a salt thereof.

Abstract: Processes for the production of polyolefins are disclosed in which olefins are polymerized in the presence of Ziegler catalyst components carried on magnesium oxide. The polymerization is effected in the presence of a solid catalyst comprising a transition metal halide carried on magnesium oxide, such oxide having been pretreated with an organic halide, and another catalyst component selected from the group consisting of organoaluminum compounds and alkylzinc. The combination of these catalysts contributes to increased polymer yields based on both carrier and transition metal.

Abstract: According to the present invention, there is provided a process for preparing polyolefins by polymerizing or copolymerizing olefins in the presence of a catalyst consisting of a solid component and an organometallic compound component, characterized in that said solid component is obtained by copulverizing1. a magnesium halide,2. a compound represented by the general formula Al(OR)mX.sub.3-m wherein R is alkyl and/or aralkyl having 1 to 20 carbon atoms and may be the same or different, X is halogen and O<m.ltoreq.3,3. a tetravalent titanium compound, and4. a trivalent titanium compound and in that said organometallic compound component is a mixture of5. a trialkylaluminum and6. a compound represented by the general formula AlR'nX.sub.3-n wherein R' is alkyl having 1 to 10 carbon atoms and may be the same or different, X is halogen and O<n<3.

Abstract: According to the present invention, there is provided a process for preparing polyolefins which comprises polymerizing or copolymerizing olefins using as catalyst a solid component containing a titanium compound and/or a vanadium compound, and an organoaluminum compound and/or an organozinc compound, said solid component being obtained by copulverizing (1) a magnesium halide and/or a manganese halide, (2) an aluminum oxyhalide and (3) a titanium compound and/or a vanadium compound.

Abstract: A process of polymerizing or copolymerizing a class of olefins is carried out in the presence of a catalyst, which catalyst comprises one of more solid compounds selected as a carrier from the group consisting of an oxide, a double oxide and a hydroxide of halogen-free magnesium and/or calcium. The carrier is treated by direct contact with gaseous sulfur dioxide (SO.sub.2) under a gaseous atmosphere. A titanium and/or vanadium compound, viz. Ziegler catalyst component, is deposited on the treated carrier and activated by an organometal compound.

Abstract: The present invention relates to a process for preparing polyolefins using an improved polymerization catalyst. According to the invention, there is provided a process for preparing polyolefins by polymerizing or copolymerizing olefins using a catalyst prepared from a component with a titanium compound and/or a vanadium compound supported on a solid carrier and an organoaluminum compound and/or an organozinc compound, said solid carrier comprising a member selected from the group consisting of a reaction product A obtained by reacting (1) an organic carboxylate salt of magnesium and (2) an aluminum compound represented by the general formula Al(OR).sub.3 wherein R may be same as or different from each other and each R is an organic radical containing from 1 to 20 carbon atoms under such a condition that the aluminum compound is present in excess of a (2):(1) molar ratio of at least 1.6:1 and a reaction product B obtained by treating said reaction product A with a halogenating agent.

Abstract: A process for preparing hydroxyphenyl ethers by oxidizing phenyl ethers with hydrogen peroxide in the presence of a ketone or with a ketone peroxide.

Abstract: A process for the production of polyolefins is disclosed, which is carried out in the presence of catalysts prepared according to the invention. The catalysts comprise a carrier resulting from the reaction of anhydrous magnesium halide, silicon tetrachloride and an alcohol represented by the general formulaROHwhere R is an organic group of 1 to 20 carbon atoms, and a titanium and/or a vanadium compound supported on said carrier. Such catalysts are activated by an organoaluminum and/or an organozinc compound when in use.

Abstract: Process for preparing polyolefins by polymerizing or copolymerizing olefins in the presence of an organometallic compound and a catalyst comprising magnesium, titanium and aluminum or magnesium, vanadium and aluminum, the catalysts being prepared by copulverizing a magnesium dihalide, an aluminum alkoxide and a titanium or vanadium compound.

Abstract: This invention provides a method for the preparation of polyolefins by polymerizing or copolymerizing an olefin or olefins in the presence of a catalyst composed of a titanium compound and/or vanadium compound component supported on a solid carrier and an organometallic compound component, said solid carrier comprising a reaction product obtained by reacting (1) an aluminum compound represented by the general formula Al(OOCR)(OR').sub.2 wherein R and R' being the same or different each represent alkyl, aryl or aralkyl and (2) a magnesium compound represented by the general formula Mg(OR').sub.2 where R" being the same as or different from R and/or R' is alkyl, aryl or aralkyl at a molar ratio of (1):(2) of substantially at least 2:1.