Abstract: Provided is a copolymer having a repeating unit represented by the general formula ##STR1## wherein Ar represents ##STR2## wherein R.sup.1 represents hydrogen or a hydrocarbon group having 1 to 20 carbon atoms, R.sup.2 represents hydrogen, a hydrocarbon group having 1 to 20 carbon atoms, furyl, pyridyl, chlorophenyl, nitrophenyl or methoxyphenyl, n is 1 or more and an electroactive polymer obtained by doping the above copolymer.

Abstract: In an olefin polymerizing catalyst comprising a solid catalyst component and an organometallic compound, there is used, as the solid catalyst component, a substance obtained by contacting and reacting the following compounds with one another:(1) a silicon oxide and/or an aluminum oxide,(2) a magnesium halide,(3) a compound represented by the general formula Me(OR).sub.n X.sub.z--n wherein Me is an element belonging to Groups I through IV in the Periodic Table, z is the valence of the element Me, n is 0<n.ltoreq.z, X is a halogen atom and R is a hydrocarbon radical having 1 to 20 carbon atoms,(4) a titanium compound and/or a vanadium compound, and(5) a compound represented by the general formula R".sub.n Si(OR').sub.m X.sub.4-m-n wherein R' and R" are each a hydrocarbon radical having 1 to 24 carbon atoms, X is a halogen atom, n is 0.ltoreq.n<4 and m is 0<m.ltoreq.4, with the limitation that 0<m+n.ltoreq.4, and/or a polysiloxane.

Abstract: According to this invention, there is provided a process for preparing polyolefins wherein olefins are polymerized or copolymerized using as catalyst a solid component and an organometallic compound, characterized in that said solid component is a substance obtained by the copulverization of:(1) a reaction product resulting from a heat reaction of magnesium oxide and aluminum trichloride,(2) a titanium compound and/or a vanadium compound, and(3) if desired, an organic halide.

Abstract: A process for the homopolymerization or copolymerization of olefins is disclosed. The process is carried out in the presence of a catalyst system comprising the combination of an organometallic compound with a component resulting from the mutual contact of (i) an inorganic magnesium compound of a spherical shape having an average particle size of from 1 to 100 microns; (ii) a compound represented by the formula AlX.sub.3.OR'R" (where X represents a halogen atom, and R' and R" represent a hydrocarbon residual group having 1 to 20 carbon atoms; and (iii) a titanium compound represented by the formula Ti(OR).sub.4 (where R represents a hydrocarbon residual group having 1 to 20 carbon atoms). The resulting polymers are provided with a spherical particle shape.

Abstract: An olefin is polymerized using a catalyst obtained by contacting (1) at least one of silicon or aluminum dioxide, (2) a compound of the formula ROH wherein R is a hydrocarbon radical having 1 to 20 carbon atoms, and (3) a substance obtained by supporting a titanium or a vanadium compound on a magnesium or manganese halide.