Abstract: A process for the preparation of a catalyst system for olefin polymerization, including: A) providing said procatalyst obtainable via a process comprising: i) contacting a compound R4zMgX42-z with an alkoxy- or aryloxy-containing silane compound to give a first intermediate reaction product, ii) optionally contacting the solid product obtained in step i) with at least one activating compound selected from an activating electron donor or metal alkoxide compound; iii) contacting the first or second intermediate reaction product, with a halogen-containing Ti-compound and optionally an internal electron donor to obtain the procatalyst; and B) contacting the procatalyst with a co-catalyst and at least diethylaminotriethoxysilane as the external donor.

Abstract: A dispersion stabilizer in the present invention contains an aqueous emulsion (a) obtained by dispersing a polymer (A) having an ethylenically unsaturated monomer unit in an aqueous medium, a PVA (B) having a degree of saponification of 65 mol % or more and less than 82 mol % and a viscosity-average degree of polymerization of 250 or more and less than 1500, and a PVA (C) having a degree of saponification of 82 mol % or more and less than 98 mol % and a viscosity-average degree of polymerization of 1500 or more and less than 4000. The dispersion stabilizer contains: 7 to 51 mass % of the polymer (A); 40 to 84 mass % of the PVA (B); and 9 to 53 mass % of the PVA (C), with respect to a total amount of the polymer (A), the PVA (B), and the PVA (C). A vinyl resin satisfying required performance can be obtained using the dispersion stabilizer.

Abstract: Pneumatic rubber tire intended for heavy duty service having a cap/base configured tread with a silica-containing specialized cis 1,4-polybutadiene rubber-rich tread cap rubber layer.

Abstract: A method for preparing a functionalized polymer, the method comprising the steps of preparing a reactive polymer and reacting the reactive polymer with a heterocyclic nitrile compound.

Abstract: A method for preparing a functionalized polymer, the method comprising the steps of preparing a reactive polymer and reacting the reactive polymer with a heterocyclic nitrile compound.

Abstract: A process for simply and inexpensively producing a conjugated diene polymer with a narrow molecular weight distribution and a high cis-bond content at a low cost is provided. The process comprises a polymerization step, wherein a conjugated diene polymer having a cis-1,4-bond content of 98.5 mass % or more and a ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) measured by gel permeation chromatography of 2.5 or less is obtained by carrying out a polymerization reaction in conjugated diene compounds using a catalyst composition containing a rare earth element-containing compound or a reaction product of the rare earth element-containing compound with a Lewis base, an aluminoxane and/or organoaluminum compound, and an iodine-containing compound.

Abstract: A curable composition for forming anisotropically conductive bonds comprising: (i) an amount of first substantially uncured curable component; (ii) conductive particles coated with a substantially uniformly thick coating of the cure product of a second curable component dispersed within the first curable cyanoacrylate component. The composition is suitable for use as an adhesive composition for bonding chips to electronic circuits. Desirably the first component and the second component are both cyanoacrylates.

Abstract: Disclosed are propylene-based polymer compositions and processes for producing same. Polymerization with an improved catalyst composition provides a propylene-based polymer with improved stiffness.

Abstract: Production method of polyvinyl chloride in an agitated reactor under pressure, including polymerization of vinyl monomers in aqueous suspension, of the type in which at least one vinyl monomer in aqueous solution is introduced into a reactor under agitation, having the following steps: a)—adding a stabilizing-suspending agent in hydroalcoholic suspension of an inorganic mineral powder containing at least magnesium and hydroxyl groups to said reactor, b)—adding to said reactor b1) a base; b2) a peroxide compound; b3) a chloroformate; and b4) an organic acid anhydride whereupon the separate addition of b1), b2), b3), b4), to form the reaction catalyst in situ is only and exclusively in said reactor in order to create said catalyst progressively and under the control of the addition of said stabilizing-suspending agent a).

Abstract: A process for simply and inexpensively producing a conjugated diene polymer with a narrow molecular weight distribution and a high cis-bond content at a low cost is provided. The process comprises a polymerization step, wherein a conjugated diene polymer having a cis-1,4-bond content of 98.5 mass % or more and a ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) measured by gel permeation chromatography of 2.5 or less is obtained by carrying out a polymerization reaction in conjugated diene compounds using a catalyst composition containing a rare earth element-containing compound or a reaction product of the rare earth element-containing compound with a Lewis base, an aluminoxane and/or organoaluminum compound, and an iodine-containing compound.

Abstract: A method comprising contacting a support with one or more chromium-containing compounds and one or more boria precursors to provide a catalyst precursor, and activating the catalyst precursor to provide a polymerization catalyst.

Abstract: A shrink film comprising a polyethylene film, characterized in that said polyethylene is an ethylene copolymer mixture having a molecular weight distribution in the range 10 to 35, a density of 915 to 940 kg/m3, a weight average molecular weight of at least 100000 D and an MFR2.16 (190° C.) of 0.1 to 0.9 kg/m3, which copolymer mixture is produced by a two or more stage copolymerization of ethylene and 2 to 10% mole (relative to ethylene) of a C3-12 alpha-olefin comonomer in a series of reactors including at least one slurry loop reactor and at least one gas phase reactor using a heterogeneous Ziegler-Natta catalyst.

Abstract: The present invention relates to catalyst systems for polyolefin production, and more particularly, to catalyst systems for polyolefins used in producing films.

Abstract: The invention related to a process for the polymerization of at least one aliphatic C2-20 or aromatic C4-20 hydrocarbyl mono- or multiolefin in the presence of a catalyst and an aluminum comprising co-catalyst, wherein the catalyst comprises a composition of a metal-organic reagent, a spectator ligand and optionally at least one equivalent of a hydrocarbylating agent. The invention further relates to a polymer obtainable by the process of the invention.

Abstract: Amphiphilic Group VIII metathesis catalysts, as can be used in a range of polymerization reactions and other chemical methodologies.

Abstract: The present invention relates to a method for preparing polymers by gas-phase deposition polymerization, initiated by a zero valent metal and an initiator.

Abstract: Radical polymerization process for the preparation of halogenated polymers employing one or more ethylenically unsaturated monomers, at least one of which is chosen from halogenated monomers, molecular iodine and one or more radical-generating agents chosen from diazo compounds, peroxides and dialkyl diphenylalkanes Radical polymerization process for the preparation, starting from the halogenated polymers prepared by the process as described above, of block copolymers, at least one block of which is a halogenated polymer block. Halogenated polymers which have a number-average molecular mass Mn of greater than 1.0×104 and an Mz/Mw ratio of less than 1.65. Block copolymers, at least one block of which is a block of halogenated polymer identical to the halogenated polymers described above. Block copolymers comprising at least one halogenated polymer block which have a number-average molecular mass Mn of greater than 1.5×104 and a polydispersity index Mw/Mn of less than 1.60.

Abstract: A process for working up polymer components prepared by emulsion polymerization is disclosed. The process is characterized in that coagulation of the aqueous polymer latex present after emulsion polymerization is performed using a combination of A) an aqueous solution of at least one salt selected from the group consisting of sodium chloride, calcium chloride, magnesium chloride, aluminum chloride, sodium sulfate, magnesium sulfate and aluminum sulfate, B) an aqueous solution of at least one salt of an acid selected from the group consisting of hypophosphorous acid (H3PO2), phosphorous acid (H3PO3 or HPO2) and ascorbic acid and optionally C) an aqueous dilute acid selected from the group consisting of sulfuric acid, phosphoric acid and acetic acid.

Abstract: Disclosed are internally blocked borates useful for polymerizable compositions, and polymerizable adhesives made therewith. The internally blocked borates have general structures: wherein X represents —CHR6—, oxygen or sulfur; n is an integer; R1, R2, R3, R4, R5, and R6 are independently selected, for example, from unsubstituted and substituted C1-C10 alkyl, alkylene groups, or aryl groups, including other embodiments further defined, and M is a counter ion with positive charge m.

Abstract: Disclosed are internally blocked borates useful for polymerizable compositions, and polymerizable adhesives made therewith.

Abstract: Syndiotactic 1,2-polybutadiene is a thermoplastic resin which has double bonds attached in an alternating fashion to its polymeric backbone. Films, fibers and molded articles can be made utilizing syndiotactic 1,2-polybutadiene. It can also be blended into rubbers and cocured therewith. It is generally preferred to synthesize syndiotactic 1,2-polybutadiene in an aqueous medium by suspension or emulsion polymerization. In such aqueous polymerization techniques reactor fouling and particle size control problems are frequently encountered. This invention is based upon the unexpected finding that reactor fouling can be greatly reduced or eliminated and that particle size can be regulated by conducting such aqueous polymerizations in the presence of a controlled amount of dissolved oxygen which is within the range of about 0.01 ppm to about 4 ppm.

Abstract: The invention relates to a multi-component dental cement which contains as a first component an ethylenically unsaturated polymerisable compound, as a second component calcium hydroxide, calcium oxide or a precursor thereof and also a polymerisation initiator, the constituents of which can be contained in one or more cement components, which is characterized in that the ethylenically unsaturated polymerisable compound has both at least one .beta.-dicarbonyl group and also at least one acrylic, alkacrylic or vinyl aromatic group. Also included are a process for the production of a multi-component dental cement and the use of the described polymerisable .beta.-dicarbonyl compounds in calcium hydroxide dental cements.

Abstract: A process for controlling the particle growth of a polymer in a gas phase polymerization reaction by using an inert particulate material and an unsupported liquid polymerization catalyst.

Abstract: The present invention relates to a coating solution for preventing adhesion of polymer scale and a method for preventing scale adhesion during preparation of polymers which can provide polymers having high quality without coloring thereof while preventing adhesion of polymer scale to a polymerizer when a monomer having an ethylenically unsaturated double bond is polymerized. A coating solution for preventing adhesion of polymer scale which comprises anaphthoquinone natural dyestuffs, anthraquinone natural dyestuffs, tannin natural dyestuffs, xanthone natural dyestuffs, flavonoid natural dyestuffs, or/and benzoquinone natural dyestuffs and a polyvinyl alcohol having a degree of saponification of not less than 70 mole % was applied on at least a part of a polymerizer which comes in contact with a monomer having an ethylenically unsaturated double bond and was dried to give a coating film during polymerization thereof.

Abstract: Initiator compositions for materials which can be polymerized cationically are described, these containingi) an anhydride of a polycarboxylic acid, a polyisocyanate, a cyclic carbonate, a lactone or a mixture of such compounds, and dissolved thereinii) at least one compound of the formula I[M.sup.+n (L).sub.x ].sup.n+ nX.sup.- (I)in which n is 2 or 3, M is a metal cation selected from the group consisting of Zn.sup.2+, Mg.sup.2+, Fe.sup.2+, Co.sup.2+, Ni.sup.2+, Cr.sup.2+, Ru.sup.2+, Mn.sup.2+, Sn.sup.2+, VO.sup.2+, Fe.sup.3+, Al.sup.3+ and Co.sup.3+, X.sup.- is an anion which is selected from the group consisting of AsF.sub.6.sup.-, SbF.sub.6.sup.-, BiF.sub.6.sup.- and derivatives derived from these anions in which a fluorine atom is replaced by hydroxyl groups, or in which up to 50% of the anions X.sup.-, based on the total amount of anions, can also be any desired anions, L is water or an organic .sigma.

Abstract: A method of producing polymer particles having a particle size distribution of .+-.25% with respect to each average particle size in an amount of 95 wt. % or more, within the average particle sizes ranging from 1 .mu.m to 100 .mu.m, is disclosed, which comprises the steps of: (1) adding a polymer dispersion stabilizer in an amount of 0.1 to 10 wt. % to a hydrophilic organic liquid in which the polymer dispersion stabilizer is soluble; (2) adding thereto at least one vinyl monomer in an amount of not more than 50 times by weight the amount of the polymeric dispersion stabilizer, which monomer is soluble in the hydrophilic organic liquid, but a polymer synthesized from the monomer being swelled or substantially insoluble in the hydrophilic organic liquid; and (3) polymerizing the monomer under the condition that the amount of the vinyl monomer is 200 wt. % or less of the hydrophilic organic liquid.

Abstract: A photopolymerizable coating composition comprising:(A) 100 parts by weight of a vehicle consisting essentially of a urethaneacrylate oligomer;(B) from 0.1 to 5 parts by weight of an acylphosphine oxide compound as a photoinitiator;(C) from 1 to 100 parts by weight of a color pigment; and(D) from 20 to 300 parts by weight of a transparent glass powder having an average particle size of not larger than 100 .mu.m and an index of refraction which does not differ more than 0.3 from the index of refraction of the composition excluding the color pigment.

Abstract: The invention concerns polymerizable cement mixtures containing(a) polymerizable unsaturated monomers and/or oligomers and/or prepolymers containing acid groups and/or their reactive acid-derivative groups,(b) reactive fillers that can react with these acids or acid derivatives, and(c) curing agentsthat can be employed especially in dentistry as improved dental mixtures as well as in medicine.

Abstract: A process for production of a vinyl polymer by suspension polymerization or emulsion polymerization of at least one kind of vinyl monomer in an aqueous medium is disclosed.In this process, the polymerization is carried out in a polymerizer, the inner wall surface and portions of the auxiliary equipment thereof which may come into contact with the monomer during polymerization having a surface roughness of not greater than 5 .mu.m and being previously coated with a scaling preventive comprising at least one selected from dyes, pigments and aromatic or heterocyclic compounds having at least 5 conjugated .pi. bonds. According to this process, scaling on the inner wall surface of a polymerizer, etc. during polymerization can be prevented effectively and surely.

Abstract: This process is a process for production of a vinyl chloride polymer by suspension polymerization or emulsion polymerization of vinyl chloride monomer or a mixture of vinyl chloride monomer with a vinyl monomer copolymerizable with said vinyl chloride monomer in an aqueous medium, characterized in that the polymerization is carried out in a polymerizer, the inner wall surface and portions of the auxiliary equipment thereof which may come into contact with the monomer during polymerization being previously coated with a scaling preventive comprising at least one selected from dyes, pigments and aromatic or heterocyclic compounds having at least 5 conjugated .pi. bonds, while controlling the chloride ion concentration in the reaction mixture to not higher than 100 ppm. According to said process, scaling onto the inner wall surface of a polymerizer, etc. during polymerization can be prevented effectively and surely.

Abstract: A novel class of alloocimene polymers have been prepared which are comprised of a mixture of polymer chain units of 2,3-alloocimene and 6,7-alloocimene. The novel polyalloocimenes of this invention are prepared by polymerizing alloocimene in a reaction mixture which contains a catalyst system comprised of a metal such as sodium and an aliphatic or cycloaliphatic ether such as 1,2-dimethoxyethane. The polyalloocimenes of this invention have a majority of the residual unsaturation present in pendent dimethylbutadienyl groups. The polyalloocimenes of this invention are useful in of themselves as film forming binders for inks, as tackifiers for hot melt adhesive and the like. The polyalloocimenes of this invention are also especially useful as intermediates. The presence of the substantial amount of unsaturation and particularly the conjugated unsaturation of the pendent groups make the polyalloocimenes of this invention exceptionally reactive.

Abstract: A process for the anionic polymerization or copolymerization of olefinic monomers, dienic monomers, vinyl monomers and heterocyclic monomers is described which comprises reacting at least one monomer which is an olefinic monomer, a vinyl monomer or an heterocyclic monomer with a catalyst capable of inducing anionic polymerization and an aprotic macroheterocyclic cryptant, said at least one monomer being the only medium for the reaction.The macroheterocyclic complexing agent has general formula ##STR1## in which: R.sub.1 is hydrogen, a hydrocarbon radical or alkoxycarbonyl, or the two R.sub.1 together can form a group of the general formula: ##STR2## in which A is a hydrocarbon radical,D is oxygen, sulfur, or a hydrocarbon radical, with the proviso that at leat two of the D groups are oxygen or sulfur and that if R.sub.1 is hydrogen, a hydrocarbon radical or alkoxycarbonyl, one of these two D groups is oxygen or sulfur and the other is oxygen, andn and p are integers from 1 to 3 and m is 2 or 3.

Abstract: Low softening point resins are prepared by a process which comprises polymerising using a Friedel Crafts catalyst:(1) a petroleum resin feed comprising C.sub.5 olefins and C.sub.5 diolefins or a mixture of C.sub.5 and C.sub.6 olefins and diolefins, said feed being obtained from the cracking of petroleum feedstock and being subjected to thermal soaking at a temperature of 100.degree. C to 150.degree. C, and(2) a branched chain reactive aliphatic olefin or an oxygenated transfer agent.Preferred additives are diisobutene or U.O.P. olefins. The polymerization may take place in the presence of a C.sub.8 to C.sub.10 unsaturated aromatic compound.

Abstract: Aluminum-containing resins are produced by reactively contacting resin-forming monomers in the presence of aluminum metal which has been activated by permeation of high purity aluminum with mercury, gallium or an alloy of indium and gallium. In certain cases a co-catalyst, such as a halogen, is utilized.