Abstract: A method for producing polymers with narrow molecular weight distribution which involves combining (1) an initiator component of the formula ##STR1## in which R.sub.1, R.sub.2, and R.sub.3 are alkyl, aryl, or aralkyl groups, and can be the same or different, and X is an acetate, etherate, a hydroxyl group, or a halogen, and i is a positive whole number, (2) a Lewis acid of the formula MX.sub.n in which M is titanium, aluminum, boron, or tin, X is a halogen, and n is a positive whole number, (3) an electron donor component having an electron donor number of from at least about 25 to no more than about 50, (4) a solvent for the preceding and (5) a hydrocarbon monomer component.

Abstract: A process for producing a polyolefin, which comprises polymerizing at least one olefin in the presence of a catalyst system comprising (A) a solid catalyst component (A) obtained by reacting to a uniform solution containing (i) at least one member selected from the group consisting of metallic magnesium and an organic hydroxide compound, and an oxygen-containing organic magnesium compound, and (ii) at least one oxygen containing organic titanium compound, (iii) at least one organic aluminum compound, (iv) at least one boron compound having an alkoxy group, and (v) at least one aluminum halide compound; and (B) at least one catalyst component (B) selected from the group consisting of organic metal compounds of metals of Groups Ia, IIa, IIb, IIIb and IVb of the Periodic Table.

Abstract: Polymers of propene are prepared using a Ziegler-Natta catalyst system consisting of (1) a titanium component which is based on a finely divided, shape-imparting silica gel and contains, in addition to titanium, magnesium, chlorine and a benzenecarboxylic acid derivative, (2) an aluminum component and (3) a silane component. In this process, a titanium component (1) is used which is obtained by a method in which (1.1) first (I) a carrier is prepared from (Ia) a silica gel, (Ib) an alkanol, (Ic) an organomagnesium compound and (Id) a gaseous chlorinating agent by a procedure in which (1.1.1) first (Ia) is reacted with (Ib), (1.1.2) then the mixture obtained in (1.1.1) is combined with (Ic), (1.1.3) then (Id) is passed into the mixture obtained in (1.1.2) and (I) is isolated, (1.2) thereafter a solid-phase intermediate is prepared from (I), (II) an alkanol, (III) titanium tetrachloride and (IV) a phthalic acid drivative by a procedure in which (1.2.1) first (I) is reacted with (II), (1.2.

Abstract: A process has been discovered for the polymerization of ethylene and mixtures of ethylene with at least one other mono-1-olefin by employing a polymerization catalyst that produces polymers containing terminal vinyl unsaturation wherein such catalyst is exposed to a modifying agent prior to or during the polymerization reaction.

Abstract: Novel hydrogels and hydroplastics are described which exhibit temperature dependent, reversible phase separations and clear-opaque transitions between 1.degree. and 100.degree. C. These materials consist of linear or crosslinked random copolymers of N,N-dimethylacrylamide with alkyl- and alkoxyalkyl acrylates. The water solubility and water swelling of these polymers is extremely temperature dependent; they show sharply defined clear to opaque transitions in their water swollen state and as soluble polymers show Lower Critical Solution Temperatures (LCST). They are useful in drug delivery systems, absorption and extraction processes and as qualitative thermometers, thermosensors and self-activating sunscreens, for example in greenhouses.

Abstract: A process for the production of primarily syndiotactic vinyl aromatic polymers by polymerizing or copolymerizing vinyl aromatic monomers such as styrene or styrene derivatives in the presence of a catalyst system comprising the product of the reaction between:a) a compound of a transition metal (M) different from titanium and containing at least a bond M-O, M-C, M-N, M-P, M-S or M-halogen, andb) an organoaluminum compound containing at least an oxygen atom bound to the aluminum atom or bound between two aluminum atoms.Compound a) can be used as such or may be supported on a suitable carrier.

Abstract: Continuous processes for producing high melting and viscoelasting polypropylene or ethylene-propylene copolymer are provided.These processes are characterized by (1) using two or more polymerizers connected in series, (2) supplying the whole amount of a catalyst and a molecular weight regulator (hydrogen) in the first tank and (3) a degasification amount of each tank in the second and subsequent tanks being 0.5 to 10 V.sub.1 /Hr (wherein V.sub.1 is a volume of the tank) calculated at 0.degree. C. and 0 Kg/cm.sup.2 G. In the process for producing the copolymer, (4) monomers having an ethylene content of 5 wt % or less are supplied in the first step. According to the processes of the present invention, polymers having a broad molecular weight distribution and good fluidity upon extrusion molding can be obtained and operational control in production is simply made.

Abstract: A process for the preparation of olefin polymers, which comprises polymerizing an olefin in the presence of a catalyst which comprises: (A) a solid catalyst component obtained by contacting a magnesium dihalide such as MgCl.sub.2 with a titanium tetra-alkoxide such as Ti(O-nBu).sub.4 and then with a polymeric silicon compound having a structure represented by the formula ##STR1## wherein R stands for a hydrocarbon residue such as CH.sub.3, and contacting the obtained solid component with a halogen compound of silicon such as SiCl.sub.4 or with a halogen compound of silicon such as SiCl.sub.4 and a halogen compound of titanium such as TiCl.sub.4, (B) an organoaluminum compound such as Al(Et).sub.3 ; and (C) an organic silicon compound having an Si--O--C linkage such as PhSi(OEt).sub.3. According to this process, a polymer having a high stereoregularity, a narrow particle size distribution and a high bulk density can be obtained in a high yield with a high efficiency.

Abstract: A method of manufacturing a polyolefin using a catalyst system of an ingredient (A) and ingredient (B), with ingredient A being obtained through successive reaction steps. Ingredient A is prepared by forming a mixture of (1) the combination of (a) metallic magnesium or an oxygen-containing organic compound of magnesium with (b) a mixture of a monohydroxylated organic compound and a polyhydroxylated organic compound, (2) oxygen-containing organic compounds of titanium and (3) at least one alpha-olefin having at least 4 cargon atoms, such as 1-hexene. The resulting solution is reacted in sequence with (4) at least one first halogenated aluminum compound, (5) at least one silicon compound and (6) at least one second halogenated aluminum compound. Ingredient B is an organometallic compound of metals from Group Ia, IIa, IIIa or IVa of the Periodic Table. The resulting free-flowing polyolefin is characterized by a large average particle size and small amount of fine particles.

Abstract: A polymer-type polymerization initiator produced by copolymerizing (A) 40 to 60 mole % of an N-vinyllactam and (B) 60 to 40 mole % of at least one fumarate containing a peroxy group, the peroxy-fumarate (B) being represented by the following formula: ##STR1## wherein R1 is a linear alkyl, branched alkyl or cycloalkyl group containing not more than 18 carbon atoms, or an aromatic hydrocarbon group containing 6 to 18 carbon atoms; and R2 is a linear alkyl, branched alkyl or cycloalkyl group containing not more than 13 carbon atoms, or a phenyl group.The peroxy-fumarate (b1) may be used in combination with (b2) at least one diester of fumaric acid selected from the group consisting of alkyl fluoroalkyl fumarate, alkyl silicon-containing-alkyl fumarate, fluoroalkyl silicon-containing-alkyl fumarate, bis(fluoroalkyl) fumarate, and bis(silicon-containing-alkyl) fumarate, a mole ratio of the peroxy-fumarate to the diester of fumaric acid falling within a range of 9 to 1 to 1 to 9.

Abstract: A syndiotactic polyolefin is obtained in a high yield by polymerization or copolymerization of an olefin of the formula R.sup.a --CH.dbd.CH--R.sup.b in the presence of a catalyst consisting of a metallocene of the formula I ##STR1## and an aluminoxane. This polyolefin has a very high syndiotactic index. At a low polymerization temperature, a polyolefin having a low average molecular weight and narrow molecular weight distribution is obtained, and at a high polymerization temperature a polymer having a high average molecular weight and a wide molecular weight distribution is obtained.Shaped articles produced from the polymers are distinguished by a high transparency, flexibility, tear strength and excellent surface gloss.

Abstract: The invention relates to a process for preparing polymers, with a polydispersity optionally approaching the theoretical polydispersity and substituted by functional groups in .alpha.,.omega.-positions, via radical polymerization of radically polymerizable monomers and using one or more initiators. In compliance with this process the degree of polymerization is maintained at the desired value by continuous elevation of the temperature.In case of a given heat program, the process of the invention renders possible to increase the conversion in producing polymers without the deterioration of the polydispersity.

Abstract: A catalyst system comprising:(i) a catalyst precursor, which includes: magnesium; titanium; a halogen, which is chlorine, bromine, or iodine, or a mixture thereof; one or two inside electron donors; and a cerium (IV) compound;(ii) a hydrocarbylaluminum cocatalyst; and(iii) a selectivity control agent. wherein the atomic ratio of aluminum to titanium is in the range of about 5 to about 300 and the molar ratio of aluminum to selectivity control agent is in the range of about 0.1 to about 100.

Abstract: An olefin polymerization catalyst comprising (a) a supported transition metal containing component comprising the support treated with at least one metallocene and at least one non-metallocene transition metal compound, and a cocatalyst comprising an alumoxane and an organometallic compound of a metal of Groups IA, IIA, IIB, or IIIA of the Periodic Table.

Abstract: An olefin is polymerized or copolymerized under the presence of an olefin-polymerizing catalyst prepared from (A) a transition-metal compound or (A') a transition-metal compound loaded on a fine-particle carrier, said transition metal being selected from group IVB in the periodic table; (B) an aluminoxane; and (C) an organoaluminum compound represented by the general formula [I] or [II]:R.sup.1.sub.m Al(OR.sup.2).sub.3-m [I]R.sup.3.sub.n Al(OSiR.sup.4.sub.3).sub.3-n [II]wherein R.sup.1, R.sup.2, and R.sup.3 are selected from hydrocarbon radicals, R.sup.4 is selected from the group consisting of hydrocarbon, alkoxy, and aryloxy radicals, and m and n are positive numbers of 0<m<3 and 0<n<3. This catalyst has a significantly high polymerization activity, and the thus produced olefin polymer or copolymer has a narrow composition distribution, a high bulk density, and uniform grain size with little powdery product.

Abstract: A process for producing an ethylene copolymer, which comprises contacting ethylene and an .alpha.-olefin having 3-20 carbon atoms such as hexene with a catalyst comprising the following components (A) and (B):Component (A)a solid catalyst component for a Ziegler type catalyst which is obtained by contacting a magnesium halide such as MgCl.sub.2, a titanium halide such as TiCl.sub.3 and tetrahydrofuran and has a molar ratio of tetrahydrofuran/titanium in the range of 3-20; andComponent (B)an alumoxane having a structure of ##STR1## with an average polymerization degree m in the range of 3-50 and having a hydrocarbyl group R.sup.3 of 1-10 carbon atoms such as hexaisobutyltetraalumoxane where R.sup.3 is isobutyl and m is 4.

Abstract: A process for the preparation of linear olefins which comprises polymerizing ethylene in a hydrocarbon solvent at a temperature of 50.degree.-150.degree. C. in the presence of a catalyst comprising a zirconium metal compound, an organometallic compound wherein the metal is selected from the group consisting of zinc, magnesium and aluminum, and a basic salt of a carboxylic acid which forms a fine suspension or a homogeneous solution in the hydrocarbon solvent wherein the ratio of the salt equivalents to the moles of zirconium compound is from above 0 to about 4.0.

Abstract: A manufacturing method of polyolefin is disclosed wherein the catalyst used for the polymerization of .alpha.

Abstract: Herein is disclosed a vulcanizable rubber composition comprising a copolymer rubber constituted of ethylene, propylene and nonconjugated polyene, wherein ethylene/propylene molar ratio is 78/22 to 97/3 and the total content of propylene and nonconjugated polyene is 6 to 30% by mole in said copolymer rubber. By the use of the rubber composition of the present invention, a vulcanized product excellent in tensile strength, heat resistance, oil resistance, compression set resistance and flex behavior can be obtained. The vulcanized product can be used as automobile parts and other innumerable articles such as socket cover, heat resistant hose, electric wire, condenser cap, heat resistant belt, vibration-proof rubber, hoses weather strip, seal sponge, black side wall of tire, etc.

Abstract: A method is disclosed for controlling the polymerization process of olefinic hydrocarbons in an inert solvent which provides continuous control of Mooney viscosity and molecular weight distribution of the obtained polymer. In the disclosed method, means (4, 5) are included for measuring the temperature of a polymer solution in different parts of a reactor (1) provided with agitation (2), as well as means (6) for measuring the dynamic or kinematic viscosity of the polymer solution and means (7) for measuring the polymer concentration in the solution. A valve (8) mounted on the catalyst feed line controls the catalyst flow rate. A computer (9) is used to control the entire process by calculating the Mooney viscosity from the dynamic viscosity and polymer concentration and adjusting the process parameters as necessary to achieve a pre-set Mooney viscosity.