Abstract: An olefin polymerization supported catalyst comprising a support and the reaction product of a metallocene of Group 4b, 5b or 6b of the Periodic Table and an alumoxane, said reaction product formed in the presence of a support.

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: Disclosed is a process for preparing high molecular weight ethylene-.alpha.-olefin elastomers, preferably an ethylene-propylene elastomer, by liquid phase polymerization of the requisite monomers in the presence of a metallocene/alumoxane catalyst system. Preferably, the process is carried out as a slurry polymerization utilizing the metallocene/alumoxane catalyst in supported form on a silica gel support with the .alpha.-olefin monomer maintained in liquid state and used in excess to serve as a polymerization diluent. The metallocene component of the catalyst by which the process is practiced is of the formula: ##STR1## wherein M is zirconium, titanium or hafnium; each R.sup.1 independently is a C.sub.1 -C.sub.20 linear, branched or cyclic alkyl group or a C.sub.2 -C.sub.4 cyclic alkylene group which forms a fused ring system group; R.sup.2 is a C.sub.1 -C.sub.6 linear, branched or cyclic alkylene, a Si.sub.1 -Si.sub.

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: A modified composition is disclosed for compounding with a polyolefin to produce a resin from which cement adherent polyolefin fibers may be produced by conventional fiber forming methods. The modifier composition comprising a polyolefin resin modified to contain a reactive Si(IV) moiety. A preferred embodiment comprises the reaction product obtained from the high shear dry blending of an alkylamino alkoxysilane with an acid modified polyolefin, preferably gamma-aminopropyltriethoxysilane dry blended with meleated polypropylene. Such modifier composition when compounded in from about 1 to about 10 weight percent with a polyolefin, preferably polypropylene, provides a resin from which cement adherent fibers may be produced.

Abstract: A polyolefin composition incorporating in 100 parts by weight of a polyolefin, (A) 0.05 to 1 part by weight of a hindered amine type compound, (B) 0.02 to 1 part by weight of an organic phosphorus type compound, and (C) 0.02 to 0.5 part by weight of hydrotalcite.

Abstract: An adhesive comprising a copolymer and an optionally hydrogenated light color petroleum hydrocarbon resin including an aromatic hydrocarbon component useful for tackifying block copolymers is described which has a softening point of about 0.degree. C. to about 40.degree. C., a number average molecular weight (Mn) of from 350 to 600 and a molecular weight distribution (Mw/Mn) of from 1:1 to about 2.0.

Abstract: Generally, linear polyethylene containing long chain branching is obtained by polymerizing ethylene in the presence of a catalyst comprising a transition metal compound such as titanium chloride, an organoaluminum compound represented by the formula R.sub.1 R.sub.2 AlR.sub.p wherein R.sub.1 and R.sub.2 are the same or different hydrocarbyl groups having from 1 to 18 carbon atoms and R.sub.p is a polymeric hydrocarbyl group containing long chain branching aluminum alkyl cocatalyst.

Abstract: A process for producing a catalyst component for polymerization of olefins which comprises contacting (a) a metal oxide with (b) a magnesium alkoxide, contacting the resulting contact product with (c) a halogen-containing compound, and finally contacting the resulting contact product with (d) a titanium compound.

Abstract: An adhesive composition which contains a thermoplastic elastomer which includes ethylene propylene rubber, ethylene propylene diene monomer, polyisobutylene butyl rubber, ethylene vinyl acetate graft copolymers thereof with C.sub.3 to C.sub.10 unsaturated mono- and polycarboxylic acids, a tackifying resin and a di- or polyamine cross-linking agent having 2-10 carbon atoms, which is useful as a hot melt or pressure sensitive adhesive having enhanced higher temperature properties.

Abstract: Disclosed is a method for the production of a gas-pervious composite film comprising the steps of unaxially or biaxially drawing a film composed of a crystalline polyolefin resin, a rubbery polymer, and a filler thereby forming a drawn film, joining said drawn film to a meshed sheet by hot pressing at a temperature exceeding the temperature at which said drawn film begins to undergo thermal shrinkage thereby fastening said drawn film to said meshed sheet and, simultaneously, causing thermal shrinkage of said drawn film and consequently imparting a microporous texture to said film.

Abstract: High melt flow rate polymers are pelletized with greater uniformity and less malformed pellets from underwater extrusion process by die orifices having a narrow preland sufficient to evenly distribute the polymer followed by a wide final hole that forms a polymer strand sufficient to avoid deformation by water currents during pelletization.

Abstract: This invention relates to a process for preparing a supported metallocene alumoxane catalyst for use in the gas phase polymerization of olefins. The invention particularly relates to the use of silica gel containing from about 6 to about 10 percent by weight adsorbed water as the catalyst support material. It has been found that such silica gel may be safely added to an aluminum trialkyl solution to form by direct reaction with the adsorbed water content of the silica gel catalyst support material the alumoxane component of the catalyst system. An alumoxane coated silica gel is formed to which a metallocene may be added and the resulting material dried to free flowing powder. The dry free flowing powder may then be used as a supported metalllocene alumoxane catalyst complex for gas phase polymerization of olefins.

Abstract: A method for the production of a catalyst carrier for use in the polymerization of an olefin, which method comprises causing a magnesium-containing solid obtained by contact of (A) magnesium metal, (B) a halogenated hydrocarbon represented by the general formula, RX wherein R stands for an alkyl, aryl, or cycloalkyl group having 1 to 20 carbon atoms and X for a halogen atom, and (C) a compound of the general formula, X.sub.n.sup.1 M(OR.sup.1).sub.m-n wherein X.sup.1 stands for a hydrogen atom, a halogen atom, or a hydrocarbon group having 1 to 20 carbon atoms, M for a boron, carbon, silicon, aluminum, or phosphorus atom, R.sup.1 for a hydrocarbon group having 1 to 20 carbon atoms, and m for the valency of said atom M, providing that m>n.gtoreq.0 is satisfied, to contact (D) a halogen-containing alcohol.

Abstract: A method for the production of a catalyst component for use in the polymerization of an olefin, which method comprises causing a magnesium-containing solid obtained by contact of (A) magnesium metal, (B) a halogenated hydrocarbon represented by the general formula, RX, wherein R stands for an alkyl, aryl, or cycloalkyl group having 1 to 20 carbon atoms and X for a halogen atom, and (C) a compound of the general formula, X.sub.n.sup.1 M(OR.sup.1).sub.m-n, wherein X.sup.1 stands for a hydrogen atom, a halogen atom, or a hydrocarbon group having 1 to 20 carbon atoms, M for a boron, carbon, silicon, aluminum, or phosphorus atom, R.sup.1 for a hydrocarbon group having 1 to 20 carbon atoms, and m for the valency of said atom M, providing that m>n.gtoreq.0 is satisfied, to contact (D) a halogen-containing alcohol and then contact (E) a titanium compound.

Abstract: A method for the production of a catalyst component for use in the polymerization of an olefin, which method comprises causing a magnesium-containing solid obtained by contact of (A) magnesium metal, (B) a halogenated hydrocarbon represented by the general formula, RX [wherein R stands for an alkyl, aryl, or cycloalkyl group having 1 to 20 carbon atoms and X for a halogen atom], and (C) a compound of the general formula, X.sub.n.sup.1 M(OR.sup.1).sub.m-n [wherein X.sup.1 stands for a hydrogen atom, a halogen atom, or a hydrocarbon group having 1 to 20 carbon atoms, M for a boron, carbon, silicon, aluminum, or phosphorus atom, R.sup.1 for a hydrocarbon group having 1 to 20 carbon atoms, and m for the valency of said atom M, providing that m>n.gtoreq.0 is satisfied], to contact (D) a halogen-containing alcohol and then contact (E) an electron donor type compound and (F) a titanium compound.

Abstract: An olefin polymerization supported catalyst comprising a support and the reaction product of a metallocene of Group 4b, 5b or 6b of the Periodic Table and an alumoxane, said reaction product formed in the presence of a support.

Abstract: A modifier composition is disclosed for compounding with a polyolefin to produce a resin from which cement adherent polyolefin fibers may be produced by conventional fiber forming methods. The modifier composition comprises the reaction product of a vinyl alcohol copolymer with an acid modified polyolefin. Such modifier composition when compounded in from about 1 to about 10 weight percent with a polyolefin, preferably polypropylene, provides a resin from which cement adherent fibers may be produced.

Abstract: An olefin polymerization catalyst comprising the reaction product of a metallocene complex of Group IVB, VB, VIb, and VIII of the Periodic Table and an excess of alumoxane.

Abstract: The invention relates to the process of the invention provides a radiation-crosslinked polypropylene foam by extrusion at a low temperature (about 170.degree. C.) below the decomposition point of the blowing agent. The resulting foamed item has by far better heat resistance than conventional ones.The raw resin can be prepared by mixing a resin in the pellet form and a blowing agent in the powder form on account of the low-temperature flowability. Heretofore, such mixing was impossible because the blowing agent does not disperse completely.This outstanding effect of the invention was not expected at all from the known prior arts.