Abstract: The present invention provides a rubber composition and a pneumatic tire using the rubber composition. A rubber composition which comprises: a blend rubber of a copolymer and other diene base rubbers, the copolymer being obtained by copolymerization of 1,3-butadiene and an aromatic vinylmonomer using an organic lithium compound as an initiator, the glass transition point of the copolymer being −50° C. or more, and the blend rubber comprising the copolymer in an amount of 20 parts by weight or more and the other diene base rubbers in an amount of 80 parts by weight or less per 100 parts by weight of the blend rubber; silica filler in an amount of 10 to 80 parts by weight per 100 parts by weight of the blend rubber; carbon black in an amount of 20 to 80 parts by weight per 100 parts by weight of the blend rubber; and a specific silane coupling agent, i.e.

Abstract: A polyolefin composition is provided which consists essentially of isotactic polypropylene and, optionally, repeating units of one or more comonomers, wherein the total comonomer repeating unit content of the polyolefin composition is from 0 to 20 mole percent, and further, wherein the weight average branching index g′ for the lower molecular weight region of the polyolefin composition is less than 0.93. Additionally, a process is provided for producing a polyolefin composition comprising: a) contacting, in solution, at a temperature from about 90° C. to about 120° C.

Abstract: There are herein disclosed a branched ethylenic macromonomer which can function as a comonomer to provide a copolymer having excellent molding and working properties and which can be hydrogenated to provide a hydrogenated product as a wax useful in various uses, a copolymer having the excellent molding and working properties obtainable by using this macromonomer as a comonomer, and a branched ethylenic polymer having a low-molecular weight obtainable by hydrogenating the macromonomer.

Abstract: A uniaxially heat-shrinkable, biaxially oriented, multilayer film having a polypropylene-containing core layer comprising at least 70 wt. % of said multilayer film and optionally, at least one polyolefin-containing skin layer adjacent said core layer, is prepared by biaxially orienting a coextrudate and therefore orienting said coextrudate by stretching 10 to 40 % in the machine direction. The core layer contains isotactic polypropylene and a sufficient amount of syndiotactic polypropylene to inhibit uniaxial heat shrinkage at temperature below about 50.degree. C. The skin layer can be selected from the group consisting of polypropylene, ethylene-propylene copolymer, polyethylene, and ethylene-propylene-butylene terpolymer.

Abstract: Homopolymers or copolymers of acrylates, homopolymers or copolymers of norbornenes, and copolymers of acrylates with norbornenes, may be prepared by contacting acrylate and/or norbornene monomer reactant under polymerization conditions and in the presence of a solvent with a catalyst system consisting essentially of a Pd(II) dimer component having the formula:[(L)Pd(R)(X)].sub.2,where L is a monodentate phosphorus or nitrogen ligand, X is an anionic group, and R is an alkyl or aryl group.

Abstract: Curable compositions containing novel polysiloxanes having various reactive functional groups are disclosed. The curable compositions are useful as both ambient-cured and thermally-cured coating compositions which provide such properties as excellent appearance, mar resistance, acid etch resistance, adhesion, pot life, improved tack time, mar resistance and corrosion resistance.

Abstract: An .alpha.-olefin polymer well balanced between stiffness, stickiness, processability, etc., which intrinsic viscosity [.eta.] is in the range of from 0.5 to 10 and which 20.degree. C. xylene-soluble fraction (CXS) content (% by weight) and 105.degree. C. xylene-insoluble fraction (XIS) content (% by weight) satisfy a condition of XIS.ltoreq.70.00-3.64CXS, provided that CXS is not smaller than 0 and not greater than 15; a specified .alpha.-olefin polymerizing catalyst for producing the polymer; a process for producing the polymer using the specified .alpha.-olefin polymerizing catalyst; a polypropylene for use in the production of a biaxially oriented film excellent in stretchability and satisfying the conditions (1)-(3) mentioned below; and a biaxially oriented film excellent in stiffness and dimensional stability obtained by stretching the polypropylene:(1) the content of 20.degree. C. xylene-soluble fraction (CXS) is 3.5% by weight or less,(2) the content of 20.degree. C.

Abstract: Compositions comprising at least one nonvolatile acetylene alone or together with a strained cycloolefin and catalytic amounts of a catalyst for metathesis polymerization, which comprise at least one one-component catalyst from the group molybdenum compounds, tungsten compounds, niobium compounds and tantalum compounds which comprise (a) either at least two methyl groups or two monosubstituted methyl groups without .alpha. hydrogen atoms in the substituent or (b) at least one halogen and only one silylmethyl group attached to the metal. The storage-stable compositions can be polymerized by the action of actinic radiation or by short-term irradiation and subsequent thermal curing. The polymers can be used to prepare shaped articles, films, coatings and relief images.

Abstract: The synthesis of the organo-Lewis acid perfluorobiphenylborane (PBB) and the activation of metallocenes for the formation of a variety of highly active homogeneous Ziegler-Natta metallocene olefin polymerization, copolymerization and ring-opening polymerization catalysts is described.

Abstract: A coating composition which is capable of crosslinking at ambient and elevated temperatures which includes a polymerized monomer having the formula ##STR1## wherein R is hydrogen or an alkyl group containing 1-5 carbon atoms, R.sub.1 and R.sub.2 are hydrogen or a methyl group; --X-- is a bond, --O-- or --NH--; Ar is unsubstituted arylene; n is 0-10 and m is 1 or 2; wherein when X is O or NH, n is at least 1. A process for preparing the composition suspensions is also presented. The coating composition is useful in coatings, inks, overprint, varnish and surface treatment applications.

Abstract: A propylene-1-butene copolymer wherein a Shore A-scale hardness measured according to ASTM D2240 is not more than 70 and an intrinsic viscosity [.eta.] measured in axylene solvent at the temperature of 70.degree. C. is not less than 0.3 and which shows no crystalline melting peak and no crystallization peak in differential scanning calorimeter (DSC) mesurement.

Abstract: Coatings of electrically conductive polythiophene salts, polythiophene.sup.+ /An.sup.-, and hydrolyzable silanes, wherein the polythiophene group contains positively charged and uncharged recurring units of the formula (I): ##STR1## where, n is an integer from 5 to 100, andR.sub.1 and R.sub.2, independently of one another, represent hydrogen, an optionally substituted alkyl group having 1 to 20 carbon atoms, --CH.sub.2 --OH, or an aryl group having 6 to 14 carbon atoms, orR.sub.1 and R.sub.2, together, represent an optionally substituted alkylene group having 1 to 20 carbon atoms, andAn.sup.- means a polyanion,and wherein the silanes have been hydrolyzed in the presence of the conductive polythiophene salts, and the use thereof for the production of scratch-resistant electrically conductive coatings.

Abstract: An ethylene polymer having small values of Mw/Mn and Mz/Mw, a small proportion of long-chain branches, a high melt tension and a high swell ratio, and a process for preparing the ethylene polymer are disclosed. A solid titanium catalyst component obtained by initially bringing a solid titanium composite which is obtained by the contact of a solid magnesium aluminum composite containing magnesium, halogen, aluminum, and an alkoxy group of 6 or more carbon atoms and/or alcohol of 6 or more carbon atoms with a tetravalent titanium compound into contact with an organometallic compound, and then bringing the resulting product into contact with oxygen is further disclosed. An ethylene polymerization catalyst comprising the above catalyst component and an organometallic compound catalyst component is furthermore disclosed. Therefore, the ethylene polymer is excellent in moldability, and a molded article obtained therefrom is excellent in rigidity and impact resistance and free from poor appearance.

Abstract: The use of perpendicular spray nozzles to deliver liquid catalyst to a gas-phase polymerization reactor is taught. Moreover, a method of reducing the amount of gas needed to deliver catalyst is also taught.

Abstract: Exposing to visible light atom transfer radical polymerizations of vinyl monomers that use transition metal compounds often results in faster polymerizations and/or the need for less transition metal compound. Disclosed is a process for the polymerization of vinyl monomers by atom transfer radical polymerization using a first compound containing a transition metal and a second compound capable of radically transferring an atom or group to said first compound, wherein the improvement comprises, irradiating with visible light with an intensity of at least about 5 mW/cm.sup.2 a liquid in which said polymerization is taking place. The polymers made are useful for molding resins and coatings.

Abstract: A silicone emulsion composition is disclosed which comprises specific amounts of (A) a colloidal silica-silicone core/shell material comprising (a) from 80 to 5 wt % colloidal-silica cores and (b) from 20 to 95 wt % shells comprising a specific polyorganosiloxane containing ethylenically unsaturated groups, (B) a specific polyorganohydrogensiloxane, (C) a curing catalyst, (D) an emulsifying agent, and (E) water. Also disclosed is a process for producing a silicone powder which comprises bringing the silicone emulsion composition into contact with a liquid or a gas while heating the composition at a temperature of 25.degree. C. or a higher and keeping the same in a dispersed state to thereby cure the silicone in the form of a powder. The silicone emulsion composition can give an elastomer having excellent mechanical properties upon the removal of the volatile components by heating.

Abstract: A paperboard-based laminated structure for containers produced by co-extrusion coating or lamination of a polyethylene terephthalate layer as the product contact layer and a unique tie-layer on to paperboard, where the tie-layer is specifically ethylene-ethyl or butyl acrylate copolymer or terpolymer. This paperboard structure provides high temperature end-use performance required in dual-ovenable applications and cost savings.

Abstract: A process for the production of polysiloxane/polycarbonate block cocondensation products is disclosed. The process comprises reacting in the melt at temperatures of 250 to 320.degree. C. and pressures of 0.01 to 100 mbar (a) a hydroxyaryloxy-terminated dimethylsiloxane with (b) an oligocarbonate. The oligocarbonate is characterized in that its weight average molecular weight is 3000 to 24000 and the molar ratio of its OH end groups to aryl end groups is 10:90 to 70:30. The weight ratio of said (a) to said (b) in the inventive process is between 1:99 and 40:60. Also disclosed are the products prepared by the process.

Abstract: A process for preparing a pigmented vinylidene fluoride polymer based powder coating composition that comprises dispersing at least one pigment In an aqueous dispersion or latex of a fluorine-free polymer that is compatible with the vinylidene fluoride polymer and, if needed, conventional paint additives, which may include a polyoxyalkylene glycol block polymer. Subsequently the aqueous pigment dispersion is blended with said vinylidene fluoride polymer powder, milled, dried, and classified to obtain the specified particle size.

Abstract: Catalysts deposited on a support are described. The catalyst itself is formed by combining (i) a metallocene of a transition, lanthanide or actinide metal and (ii) a siloxy-aluminoxane composition which comprises an aluminoxane which contains hydrocarbyl-siloxane moieties which are free of Si-OH groups, wherein the molar ratio of aluminum to hydrocarbylsiloxane is from about 1:1 to 1000:1. The siloxy-aluminoxane composition used is free of Si-OH groups, and the aluminoxane of the siloxy-aluminoxane composition was formed by partial hydrolysis of trialkylaluminum. Supports for the catalysts are particulate inorganic oxides, preferably silica, alumina, silica-alumina, or a mixture thereof, or resinous polyolefin support materials.