Abstract: A catalyst composition for the polymerization of olefins is provided, comprising a bis(hydroxy aromatic nitrogen ligand) transition metal catalyst precursor and an activating cocatalyst.

Abstract: Biaxially oriented, heat-shrinkable film-making process and film with improved toughness and extrusion processibility are disclosed. The improved film comprises at least one layer of at least one substantially linear ethylene homopolymer or interpolymer, wherein the substantially linear ethylene polymer has an uniform branching distribution, and is also characterized as having essentially no linear polymer fraction, a single DSC melting peak, a density greater than about 0.85 g/cc, and a simple bubble film 1% secant modulus below 195,000 kPa. The biaxially oriented film is characterized as having a simple bubble shrinkage value of from about 18% to about 85% at 135.degree. C. and is useful in preparing heat-shrink bags for packaging food articles like poultry and fresh red meat.

Abstract: The present invention relates to a prepolymer for the polymerization of olefins, the said prepolymer achieving a combination of a number of solid catalytic components for the polymerization of olefins. The combination of catalytic components makes it possible to combine two properties within the same polymer, one of the properties being contributed by one of the catalytic components and the other property being contributed by the other catalytic component.

Abstract: Certain olefins such as ethylene, .alpha.-olefins and cyclopentene can be polymerized by using catalyst system containing a nickel or palladium .alpha.-diimine complex, a metal containing hydrocarbylation compound, and a selected Lewis acid, or a catalyst system containing certain nickel ?II! or palladium ?II! compounds, an .alpha.-diimine, a metal containing hydrocarbylation compound, and optionally a selected Lewis acid. The process advantageously produces polyolefins useful for molding resins, films, elastomers and other uses.

Abstract: Disclosed are ruthenium and osmium carbene compounds which are stable in the presence of a variety of functional groups and which can be used to catalyze olefin metathesis reactions on unstrained cyclic and acyclic olefins. Specifically, the present invention relates to carbene compounds of the formula ##STR1## wherein: M is Os or Ru; R and R.sup.1 are independently selected from hydrogen and functional groups C.sub.2 -C.sub.20 alkenyl, C.sub.2 -C.sub.20 alkynyl, C.sub.1 -C.sub.20 alkyl, aryl, C.sub.1 -C.sub.20 carboxylate, C.sub.2 -C.sub.20 alkoxy, C.sub.2 -C.sub.20 alkenyloxy, C.sub.2 -C.sub.20 alkynyloxy, aryloxy, C.sub.2 -C.sub.20 alkoxycarbonyl, C.sub.1 -C.sub.20 alkylthio, C.sub.1 -C.sub.20 alkylsulfonyl or C.sub.1 -C.sub.20 alkylsulfinyl; each optionally substituted with C.sub.1 -C.sub.5 alkyl, a halogen, C.sub.1 -C.sub.5 alkoxy or with a phenyl group optionally substituted with a halogen, C.sub.1 -C.sub.5 alkyl or C.sub.1 -C.sub.5 alkoxy; X and X.sup.

Abstract: Support for catalysts, containing at least two constituents chosen from silica, alumina and aluminium phosphate, having a specific surface of 100 to 800 m.sup.2 /g, a crystallization temperature greater than or equal to 700.degree. C. and a pore volume of 1.5 to 4 cm.sup.3 /g, the specific surface (SS) and the pore volume (PV) corresponding to the relationship:SS<(PV.times.564-358).Process for the manufacture of such a support, according to which an alcohol, water, a silicon alkoxide and an acid are mixed under conditions such that gelling or precipitation of silica is prevented, an acidic solution of an aluminium compound and/or a solution of a source of phosphate ions are added thereto, a gelling agent is added thereto, a gel is recovered which is washed with water and then by means of an organic liquid, the gel is then dried until a powder is obtained, and the powder is calcined. Polymerization of olefins in the presence of a catalyst containing chromium on a support as described above.

Abstract: A process for preparing an olefin polymer comprising the steps of: preparing an olefin polymer ?I! by polymerizing or copolymerizing an olefin in the presence of an olefin poymerization catalyst comprising a specific solid titanium catalyst component ?A!, a specific organoaluminum compound catalyst component ?B! and a specific electron donor catalyst component ?C!; preparing an olefin polymer ?II! by polymerizing or copolymerizing an olefin in an polymerizer different from that for the polymerization of the above step in the presence of an olefin poymerization catalyst comprising a specific solid titanium catalyst component ?A!, a specific organoaluminum compound catalyst component ?B! and a specific electron donor catalyst component ?D!; and then allowing the resulting olefin polymer ?I! and the resulting olefin polymer ?II! to coexist in one polymerizer to further polymerize or copolymerize an olefin.

Abstract: Metallocenes containing aryl-substituted indenyl derivatives as ligands, process for their preparation, and their use as catalysts.A very effective catalyst system for the polymerization or copolymerization of olefins comprises a cocatalyst, preferably an aluminoxane or a supported aluminoxane, and a metallocene of the formula I ##STR1## in which, in the preferred form, M.sup.1 is Zr or Hf, R.sup.1 and R.sup.2 are halogen or alkyl, R.sup.1 is alkyl, R.sup.4 to R.sup.12 are alkyl or hydrogen and R.sup.13 is a (substituted) alkylene or heteroatom bridge.The metallocenes, in particular the zirconocenes, produce polymers of very high molecular weight, in the case of prochiral monomers polymers of very high molecular weight, very high stereotacticity and very high melting point, at high catalyst activities in the industrially particularly interesting temperature range between 50 and 80.degree. C. In addition, reactor deposits are avoided by means of supported catalyst systems.

Abstract: A polyaniline is characterized by a nuclear magnetic resonance spectrum in its leuco form showing only two .sup.13 C peaks, indicating the substantal absence of chain branching, and preferably by a molecular weight (M.sub.p) above 90,000 and up to about 170,000 (more especially 100-140,000). Oriented films of such polyanilines in the protonated emeraldine oxidation state have electrical conductivities up to at least around 500 S/cm.They may be made by oxidizing aniline in aqueous solution with a persulfate under the combination of conditionsthat the acidity of the solution throughout the reaction is such that if its temperature is adjusted to 20.degree. C. it will have a pH in the range from about -0.2 to +3.0;that the temperature of the solution is in the range from -5.degree. to about -40.degree. C.

Abstract: Cocatalytic composition resulting from bringing an organoaluminium halide (A) into contact with an electron-donating organic compound (ED) selected from esters, amides and ketones, the organoaluminium halide (A) possessing an atomic ratio halogen (X)/aluminium (Al) of greater than 1 and less than 1.3, the halide (A) and the compound (ED) being employed in a mole ratio halide (A)/compound (ED) of greater than 20. Catalytic systems which are usable for the polymerization of alpha-olefins, comprising such a cocatalytic composition and a solid based on titanium trichloride complexed with an electron-donating compound.

Abstract: A polymeric optical low-pass filter of the birefringent type is provided which is lightweight and small, and which can be easily produced. Also provided are a polymeric optical low-pass filter device including the polymeric optical low-pass filter; and a composite optical filter including the polymeric optical low-pass filter. The optical low-pass filter comprises an optically anisotropic polymer film in which the displacement distance S between the ordinary ray and the extraordinary ray represented by the following formula is 1-70 .mu.m:S={(b.sup.2 -a.sup.2)/2c.sup.2 }.multidot.sin 2.phi.e,wherein a=1/n.sub.e, b=1/n.sub.0, c.sup.2 =a.sup.2 sin.sup.2 .phi.+b.sup.2 cos.sup.2 .phi., n.sub.e is the extraordinary-ray refractive index, n.sub.0 is the ordinary-ray refractive index, .phi. is the angle formed between the normal at the plane of incidence of light from a subject and the optic axis of the polymer film, and e is the thickness of the polymer film.

Abstract: A homopolymer of acrylic acid or methacrylic acid derivatives having the general formula: ##STR1## wherein R.sup.1 represents a hydrogen atom or methyl group; R.sup.2 is a residue of a compound having physiological activity; X is a residue of a compound having a hydroxyl group, amino group or carboxyl group at both ends in its chemical structure after bonding between such compound and acrylic or methacrylic acid, and between such compound and the physiologically active compound; and the homopolymer has a number-average molecular weight ranging from 20,000 to 200,000; and a process for the preparation thereof by a mechanochemical polymerization reaction; as well as a polymeric drug and prodrug comprising the homopolymer.

Abstract: Novel chromium-containing compounds, such as, for example, chromium pyrrolides, are prepared by forming a mixture of a chromium salt, a metal amide, and an electron pair donor solvent, such as, for example, an ether. These novel chromium-containing, or chromium pyrrolide, compounds can be used either unsupported or supported on an inorganic oxide support, with a metal alkyl and an unsaturated hydrocarbon, to trimerize, oligomerize, and/or polymerize olefins.

Abstract: The present invention provides a polymerizable compound represented by Formula (I): ##STR1## where X represents a hydrogen atom or a methyl group; 1 represents an integer in the range of 0 to 14; m represents 0 or 1; n represents 0 or 1; p represents an integer in the range of 0 to 6; and q represents an integer in the range of 0 to 9, wherein m is 0 under the condition 1=0, and 1 under the condition 1.noteq.0.

Abstract: The present invention relates to a transition metal compound of the formula IL.sub.n (X.sub.m A.sub.t R.sup.1.sub.q).sub.s MY.sub.r (I),whereM is a metal atom of group IIIb, IVb, Vb or VIb of the Periodic Table of the Elements,L are identical or different and are each a .pi.-ligand or an electron donor, n is 1, 2, 3 or 4,Y are identical or different and are each a hydrogen atom, a halogen atom or an 1-dentate C.sub.1 -C.sub.40 -group, where l is 1, 2, 3 or 4, r is 0, 1, 2, 3, 4 or 5,and at least one of the radicals L bears at least one group X.sub.m A.sub.t R.sup.1.sub.q, whereX are identical or different and are each a hetero atom or a C.sub.1 -C.sub.40 -group, m is 0 or 1,A is an atom of group IIIa, Va or VIa of the Periodic Table of the Elements, t is 1,R.sup.1 are identical or different and are each a C.sub.1 -C.sub.40 -group, q is 1, 2, 3, 4 or 5 and s is an integer from 1 to 20.The transition metal compound of the invention is suitable as a catalyst component for olefin polymerization.

Abstract: Multiple-phase transition copolymers are formed which can selectively bind and release a chemical, or which can selectively catalyze a specific chemical reaction.

Abstract: A material transfer arrangement having a pair of generally cylindrical adjacent rolls which are counter-rotatable about their respective cylindrical axes and which define therebetween a nip between which material passes is disclosed. There is a corresponding pair of spaced apart doctor blades, each in close proximity to a corresponding one of the rolls so that material may be conveyed between the roll nip and the space between the doctor blades. In one form, the nip passes material to the space between the doctor blades and that space has a downstream restriction which causes the material to compress in an accordion-like way forming a corrugated material web. In another form, the doctor blades function to deliver thermoplastic extrudate to the nip between the rolls to form elongated sheets or webs of plastic material of improved uniformity.

Abstract: This invention relates to block polymers containing both crystalline and elastomeric blocks, the block copolymer having an A block and a B block. The A block is a polyethylene or an ethylene polymer optionally containing an alpha-olefin and optionally a non-conjugated diene, and is generally crystalline. The B block is an ethylene, .alpha.-olefin copolymer. Also disclosed is a process for manufacture of the block copolymers and methods for coupling the block copolymers. Coupled block copolymers are useful as thermoplastic elastomers exhibiting physical properties approaching those of crosslinked EP or EPDM elastomers, but showing thermal processability after coupling. The block copolymers of the present invention may also be used as a lubricant or fuel additive, as a plastics blend component, and as a component in hot melt adhesives.

Abstract: Polar thermoplastic polyolefin blends are provided which are flexible and are particularly useful in replacing polyvinyl chloride sheeting used as liners, folders, etc. The blends comprise in general, a non-polar thermoplastic polyolefin, a functionalized polar ethylene copolymer, and a functionalized olefin polymer as a compatibilizer, all of which are chlorine-free.

Abstract: A method for producing stabilized polymers, exhibiting enhanced thermal stability, which comprises polymerizing a mixture comprising: a monomer comprising an allyl-containing group which is bonded to primary and/or secondary hydroxyl groups on a saccharide, preferably a long chain (C.sub.3 -C.sub.20) allyl-containing ether group on the hydroxyl group; and one or monomers selected from methacrylate ester monomers, acrylate ester monomers, acrylamide monomers and styrene monomers, in amounts sufficient to produce a polymer exhibiting enhanced thermal stability. Polymers having enhanced thermal stability are obtained using a monomer comprising an allyl-containing group which is bonded to primary and/or secondary hydroxyl groups on a saccharide, as a novel stabilization crosslinking agent.