Abstract: A process for producing a polymer or copolymer of an olefin which comprises polymerizing or copolymerizing at least one olefin with or without a diolefin in the presence of a catalyst composed of (A) a magnesium-containing solid titanium catalyst component containing magnesium, titanium, a halogen and an electron donor as essential ingredients and (B) an organoaluminum compound catalyst component; characterized in that(1) said catalyst further comprises (C) an organic silicon compound catalyst component having an Si--O--C or Si--N--C bond, and(2) said electron donor in the catalyst component (A) is a cyclic mono- or poly-ester such as diethyl furane-3,4-dicarboxylate, di-n-butyl 3,4-dihydro-2H-pyrane-5,6-dicarboxylate, di-isobutyl pyrrole-2,3-dicarboxylic, di-n-butyl thiophene-2,3-dicarboxylate, n-octyl pyrrolidine-2,3-dicarboxylate, and so on.

Abstract: A process for producing a propylene polymer having good flowability with an MFR of at least 10 g/10 minutes comprises a first polymerization stage consisting of at least two steps and a subsequent second polymerization stage. It is important to control the intrinsic viscositites of a crystalline propylene polymer obtained from the first step of the first polymerization stage and a crystalline propylene polymer obtained from the final step of the first polymerization stage.

Abstract: A catalyst formed from(A) a solid titanium catalyst component containing magnesium, titanium, halogen and a polycarboxylic acid ester as essential ingredients and being obtained by contacting a magnesium compound, a titanium compound and a polycarboxylic acid ester,(B) an organoaluminum compound, and(C) an organosilicon compound represented by the following formula (1)SiR.sup.1 R.sup.2 (OR.sup.3).sub.2 (1)wherein R.sup.1 is selected from the class consisting of linear alkyl groups having at least 3 carbon atoms and arylalkyl groups in which the alkyl moiety has a secondary or tertiary alpha-carbon atom, R.sup.2 is selected from the class consisting of alkyl groups and arylalkyl groups in which the alkyl moiety has a secondary or tertiary alpha-carbon atom, and R.sup.3 is a hydrocarbon group, with the proviso that when R.sup.1 is a linear alkyl group having at least 3 carbon atoms and R.sup.2 is an alkyl group, the alkyl group for R.sup.

Abstract: A cyclo-olefinic random copolymer composed of an alpha-olefin component having 3 to 20 carbon atoms and a cyclo-olefin component,(i) said copolymer containing 5 to 99 mole % of recurring units derived from said alpha-olefin component having 3 to 20 carbon atoms and 1 to 95 mole % of recurring units derived from said cyclo-olefin component, and(ii) said copolymer having an intrinsic viscosity [.eta.], measured in decalin at 135.degree. C., of from 0.01 to 10 dl/g; and an olefinic random copolymer composed of (A) an olefin component having 3 to 20 carbon atoms and (B) a cyclic polyene component and as required, (C) a cyclo-olefin component,(i) said copolymer containing 5 to 99 mole % of recurring units derived from said alpha-olefin component (A) having 3 to 20 carbon atoms and 1 to 95 mole % of recurring units derived from said cyclic polyene component (B) and 0 to 90 mole % of recurring units derived from said cyclo-olefin component (C), and(ii) said copolymer having an intrinsic viscosity [.eta.

Abstract: A cyclo-olefinic random copolymer composed of an alpha-olefin component having 3 to 20 carbon atoms and a cyclo-olefin component,(i) said copolymer containing 5 to 99 mole % of recurring units derived from said alpha-olefin component having 3 to 20 carbon atoms and 1 to 95 mole % of recurring units derived from said cyclo-olefin component, and(ii) said copolymer having an intrinsic viscosity [.eta.], measured in decalin at 135.degree. C., of from 0.01 to 10 dl/g; andan olefinic random copolymer composed of (A) an olefin component having 3 to 20 carbon atoms and (B) a cyclic polyene component and as required, (C) a cyclo-olefin component,(i) said copolymer containing 5 to 99 mole % of recurring units derived from said alpha-olefin component (A) having 3 to 20 carbon atoms and 1 to 95 mole % of recurring units derived from said cyclic polyene component (B) and 0 to 90 mole % of recurring units derived from said cyclo-olefin component (C), and(ii) said copolymer having an intrinsic viscosity [.eta.

Abstract: A liquid modified ethylenic random copolymer selected from an epoxidization product of a liquid ethylenic random copolymer of ethylene and an alpha-olefin having 3 to 20 carbon atoms and a hydroxylation product of a liquid ethylenic random copolymer of ethylene and an alpha-olefin having 3 to 20 carbon atoms. The modified copolymer is characterized in that (i) the liquid modified ethylenic random copolymer has an ethylene component content of 10 to 85 mole % and an alpha-olefin component content of 15 to 90 mole %, (ii) in the .sup.13 C-NMR spectrum of the liquid modified ethylenic random copolymer, signals of .alpha..beta. and .beta..gamma.

Abstract: A finely divided aluminoxane comprising an aluminoxane represented by formula [I] or [II] ##STR1## wherein R denotes a hydrocarbon group having 1 to 10 carbon atoms and m denotes an integer of 2 to 50,an average particle size being 5 to 200 .mu.m and a specific an average particle size being 5 to 200 .mu.m and a specific surface area being 20 to 1000 m.sup.2 /g, a process for producing same, and a catalyst component for polymerization of olefins being said finely divided aluminoxane.

Abstract: A solid titanium catalyst component (A) of a catalyst system useful in the polymerization of olefins or copolymerization of two or more olefins or one or more olefins and a diene is prepared by contacting a liquid hydrocarbon solution of (i) a magnesium compound, such as magnesium chloride, with (ii) a liquid titanium compound, such as TiCl.sub.4, or a solution of a titanium compound in a hydrocarbon solvent, to form a solid product. The solid product is formed in the presence of (D) an electron donor, e.g. methyl formate, acetic acid, acetic anhydride, acetone, methyl ether, butyl Cellosolve, dimethyl carbonate, methyl silicate. The solid product is also contacted with a polycarboxylic acid ester, e.g. diethyl methylsuccinate. The polymerization or copolymerization of the olefin is carried out in the presence of the solid titanium catalyst (A) and (B) an organometallic compound of a Group I to III metal and (C) an organic silicon compound having an Si--O--C bond.

Abstract: An .alpha.-olefinic random copolymer containing an .alpha.-olefin component having 5 to 10 carbon atoms and an .alpha.,.omega.-nonconjugated diene component having 6 to 20 carbon atoms, and optionally, a straight .alpha.-olefin component having 2 to 20 carbon atoms, wherein the copolymer comprises:(i) 70 to 99.9% by weight of a recurring unit (a) derived from the .alpha.-olefin, 0.1 to 30% by weight of a recurring unit (b) derived from the .alpha.,.omega.-nonconjugated diene and 0 to 20% by weight of a recurring unit (c) derived from the straight .alpha.-olefin component;(ii) an inherent viscosity [.eta.] measured in decalin at 135.degree. C. of from 0.5 to 10 dl/g;(iii) a crystallinity [Xc] measured by the X-ray diffraction method of from 0 to 50%;(iv) a glass transition temperature [Tg] of from 30.degree. to 60.degree. C.; and(v) an iodine value of from 0 to 10.

Abstract: The solid catalyst of this invention for olefin polymerization comprises a compound of a transition metal of Group IV of the periodic table and an aluminoxane as catalyst ingredients. The catalyst is characteristic in that it has a high specific surface area, and shows very high polymerization activity on the homopolymerization or copolymerization of olefins. Polymers obtained by using the catalyst of the invention have a high bulk density, a uniform particle size, a low fine powder content and a narrow molecular weight distribution, and in the case of copolymers, a narrow composition distribution as well.

Abstract: This invention is a catalyst for polymerization of olefins, comprising a compound of a transition metal of Group IVB of the periodic table, an aluminoxane and a particulate organic or inorganic compound carrier.This catalyst shows very high activity in the polymerization and copolymerization of olefins and gives polymers having a high bulk density, a uniform particle size, a low content of fine particles and a narrow molecular weight distribution and in the case of copolymers, a narrow composition distribution as well.

Abstract: A novel low-crystalline propylene random copolymer composition comprising[I] 60 to 95% by weight of a propylene random copolymer and[II] 5 to 40% by weight of a low-crystalline propylene random copolymerwhich has excellent heat-sealability, heat-seal imparting property, transparency and antiblocking property and containing a reduced amount of a hydrocarbon-soluble component, a process for production thereof, and polypropylene composite laminated structure having improved heat-sealability and heat seal strength at low temperatures.

Abstract: A process for producing a solid catalyst for polymerization of olefins, which comprises bringing a solution of an aluminoxane into contact with a suspension of a particulate carrier having supported thereon a compound of a transition metal of Group IVB of the periodic table in a solvent in which the aluminoxane is insoluble or sparingly soluble. In another aspect, the invention provides a process for producing a solid catalyst for polymerization of olefins, which comprises bringing a suspension of a particulate carrier having supported thereon a compound of a transition metal of Group IVB of the periodic table in a solution of an aluminoxane into contact with a solvent in which the aluminoxane is insoluble or sparingly soluble.

Abstract: A process for producing a polymer or copolymer of an olefin which comprises polymerizing or copolymerizing at least one olefin with or without a diolefin in the presence of a catalyst composed of (A) a magnesium-containing solid titanium catalyst component containing magnesium, titanium, a halogen and an electron donor as essential ingredients and (B) an organoaluminum compound catalyst component; characterized in that(1) said catalyst further comprises (C) an organic silicon compound catalyst component having an Si--O--C or Si--N--C bond, and(2) said electron donor in the catalyst component (A) is a cyclic mono- or poly-ester such as diethyl cyclohexene-1,2-dicarboxylate, di-n-butyl 1,3-cyclohexadiene-1,2-dicarboxylate, diethyl furane-3,4-dicarboxylate, di-n-butyl 3,4-dihydro-2H-pyrane-5,6-dicarboxylate, diethyl ester of cyclohexene-1,6-dicarboxylic acid, and so on.

Abstract: A novel low-crystalline propylene random copolymer composition comprising[I] 60 to 95% by weight of a propylene random copolymer and[II] 5 to 40% by weight of a low-crystalline propylene random copolymerwhich has excellent heat-sealability, heat-seal imparting property, transparency and antiblocking property and containing a reduced amount of a hydrocarbon-soluble component, a process for production thereof, and polypropylene composite laminated structure having improved heat-sealability and heat seal strength at low temperatures.

Abstract: A random 1-butene copolymer comprising 1-butene and an alpha-olefin having 5 to 20 carbon atoms, said copolymer having the following characteristics (A) to (I):(A) it comprises 50 to 99 mole % of the 1-butene component and 1 to 50 mole % of the alpha-olefin component,(B) it has an intrinsic viscosity [.eta.], measured in decalin at 135.degree. C., of from 0.5 to 6 dl/g,(C) it has a melting point [Tm], measured by a differential scanning calorimeter, of from 30.degree. to 120.degree.0 C.,(D) it has a crystallinity, measured by X-ray diffractometry, of from 5 to 60%,(E) the amount [W.sub.1 in % by weight] of that portion of it which is soluble in boiling methyl acetate is not more than 2%, and(F) the amount [W.sub.2 in % by weight] of that portion of it which is soluble in a 1:1 by volume mixture of acetone and n-decane at 10.degree. C. is less than 5.times.[.eta.].sup.-1.2.

Abstract: A branched alpha-olefinic polymer composition having excellent melt flowability, good moldability and excellent melt tension and comprising at least two branched alpha-olefinic polymers each composed of (A) recurring units derived from a branched alpha-olefin containing 5 to 10 carbon atoms and having a branch at the 3-position or a position of a higher number and (B) recurring units derived from a linear alpha-olefin containing 2 to 20 carbon atoms; and a process for producing this polymer composition by a multiplicity of polymerization steps using a catalyst formed from (A) a highly stereoregular titanium catalyst component comprising magnesium, titanium, halogen and an electron donor as essential ingredient, (B) an organoaluminum compound and (C) an electron donor.

Abstract: A random 1-butene/ethylene copolymer comprising 1-butene and ethylene, said copolymer having the following characteristics (A) to (I):(A) it comprises 50 to 99 mole % of the 1-butene component and 1 to 50 mole % of the ethylene component,(B) it has an intrinsic viscosity [.eta.], measured in decalin at 135.degree. C., of from 0.5 to 6 dl/g,(C) it has a melting point [Tm], measured by a differential scanning calorimeter, of from 30.degree. to 130.degree. C.,(D) it has a crystallinity, measured by X-ray diffractometry, of from 1 to 60%,(E) the amount [W.sub.1 in % by weight] of that portion of it which is soluble in boiling methyl acetate is not more than 2%, and(F) the amount [W.sub.2 in % by weight] of that portion of it which is soluble in a 1:1 by volume mixture of acetone and n-decane at 10.degree. C. is less than 5.times.[.eta.].sup.-1.2.

Abstract: In a process for producing olefin polymer or copolymer by using a catalyst composed of (A) a solid titanium catalyst component containing magnesium, titanium, halogen and an electron donor and derived from a magnesium-containing solid carrier obtained by contacting a magnesium compound in the liquid state with a precipitant, and (B) an organometallic compound of a metal selected from the group consisting of metals of Groups I to III of the periodic table; the improvement wherein(I) said catalyst component (A) is a reaction product of (iv) a titanium compound in the liquid state and a magnesium-containing solid carrier formed by contacting(i) a magnesium compound in the liquid state having no reducing ability and not containing a tetraalkoxy-, tetracycloalkoxy- or tetraaryloxy-titanium compound, said magnesium compound being selected from the specified group, with(ii) a precipitant other than a titanium compound, in the presence or absence of (iii) an electron donor having no active hydrogen, and(II) said reac

Abstract: A process for producing a propylene block copolymer in the presence of a highly stereospecific olefin polymerization catalyst which comprises producing a crystalline polymer or copolymer of propylene in a first stage and random-copolymerizing propylene and another alpha-olefin in a mole ratio of from 10:90 to 90:10 in the presence of the propylene polymer or copolymer in a second stage; wherein in the random copolymerization, 0.0001 to 0.5 mole, per gram atom of aluminum in the catalyst, of an oxygen-containing compound being gaseous in a standard condition or 0.001 to 1 mole, per gram atom of aluminum in the catalyst, of an active hydrogen-containing compound being liquid or solid in a standard condition is fed into the random-copolymerization reaction system.