Abstract: The invention provides an adhesive composition for conduction between electrical elements, comprising 25 to 46 parts by weight of nitrile-butadiene rubber with Mooney viscosity ranged from 50 to 75 (ML 1+4@100)° C., 25 to 45 parts by weight of acrylic oligomer, 16 to 32 parts by weight of thermoplastic resin, two organic peroxides having different one-minute half-life temperatures from each other, and a coupling agent. The thermoplastic resin is selected from the group consisting of phenoxy resin, poly(methyl)methacrylate copolymer, polystyrene copolymer and Novolak resin.

Abstract: This invention relates flame retardant compositions containing low molecular weight brominated anionic, chain transfer, vinyl aromatic polymers, hereinafter “ACTVAP”. The compositions can accommodate high bromine content while still exhibiting a low thermally labile bromine content. The compositions have glass transition temperatures, Tg, that are predictive of acceptable melt flows and heat distortion temperatures (HDT) in HIPS and ABS based formulations substrates. The compositions, are suitable flame retardant candidates for use in thermoplastic formulations, e.g. polystyrene and ABS formulations.

Abstract: This invention deals with an approach to control anionic polymerization. The anionic polymerization is conducted by adding a kind of initiator ligand compound, directly or in the form of solution into the monomer or initiator at the same or different time, or at different stages. The metal atoms in the ligand can form the association with the initiator cations, while the alkyloxy groups in the initiator ligand can restrict the entering channel of the addition of the monomers due to their relatively large volume or steric hindrance. Therefore, the initiator ligand compound can restrict the rate of anionic polymerization, restrain the side reaction, and make the anionic polymerization possible to be conducted at room or even higher temperature. The molar ratio of initiator ligand compound to initiator is from 0.01:1 to 20:1.

Abstract: This invention deals with an approach to control anionic polymerization. The anionic polymerization is conducted by adding a kind of initiator ligand compound, directly or in the form of solution into the monomer or initiator at the same or different time, or at different stages. The metal atoms in the ligand can form the association with the initiator cations, while the alkyloxy groups in the intiator ligand can restrict the entering channel of the addition of the monomers due to their relatively large volume or steric hindrance. Therfore, the initiator ligand compound can restrict the rate of anionic polymerization, restrain the side reaction, and make the anionic polymerization possible to be conducted at room or even higher temperature. The molar ratio of initiator ligand compound to initiator is from 0.01:1 to 20:1.

Abstract: Concurrently fed into a reaction zone held at about 10° C. or less are brominating agent, aluminum halide catalyst, and a solution of anionic styrenic polymer having a GPC Mn about 2000-30,000. The components are in at least two separate feed streams. The feeds are proportioned to maintain (a) the amount of aluminum halide being fed at about 0.8 mole percent or less based on the amount of aromatic monomeric units in the polymer being fed, and (b) amounts of brominating agent and unbrominated polymer in the reaction zone that produce a final washed and dried polymer product containing about 60-71 wt % bromine. The catalyst is deactivated, bromide ions and catalyst residues are washed away from the reaction mixture, and the brominated anionic styrenic polymer is recovered and dried. The dried polymer has a volatile bromobenzene content of about 600 ppm (wt/wt) or less as well as other beneficial properties.

Abstract: Embodiments of the polymerization process of the present invention are directed to polymerizing free radically polymerizable monomers in the presence of a polymerization medium initially comprising at least one transition metal catalyst and an atom transfer radical polymerization initiator. The polymerization medium may additionally comprise a reducing agent. The reducing agent may be added initially or during the polymerization process in a continuous or intermittent manner. The polymerization process may further comprises reacting the reducing agent with at least one of the transition metal catalyst in an oxidized state and a compound comprising a radically transferable atom or group to form a compound that does not participate significantly in control of the polymerization process.

Abstract: The present invention relates to a process for preparing a new nanoporous crystalline form of syndiotactic polystyrene, to the thus obtained crystalline form, to molecular-complex crystalline phases obtained by exposition of such crystalline form to low-molecular-mass molecules, and to the related processes for their preparation.

Abstract: A guiding apparatus for aiding a user in at least one of pouring, spreading, applying, shaping, troweling and sloping a predetermined amount of at least one of concrete and cement is provided. Such guiding apparatus includes at least one guide member manufactured from a predetermined material and having a predetermined size and a predetermined shape.

Abstract: The present invention relates to a transition metal half metallocene catalyst with a noble structure for preparing syndiotatic styrene polymer having high activity, superior stereoregularity, high melting point and broad molecular weight distribution and a process for preparing styrene polymer using the same. The present invention provides a half metallocene catalyst having a single nucleus structure, in which a transition metal in Groups 3 to 10 on the periodic table is connected to a cycloalkanedienyl group or its derivative forming 5-coordinate bond on a side thereof and to any one of triethanolamine, N-alkyldiethanolamine and N-dialkylethanolamine group, all of which have a plurality of binding sites and high steric hinderance, on the other side thereof. The noble metallocene catalyst according to the present invention is useful for preparing highly syndiotatic vinyl aromatic polymer with broad molecular weight distribution and high activity.

Abstract: Disclosed is a multinuclear transition metal half metallocene catalyst having a multinuclear half metallocene structure in which a transition metal of groups 3 to 10 on periodic table is connected to a cycloalkandienyl group or its derivative group on a side and also connected to phenol or phenolamine compound having a plurality of binding sites on another side. The metallocene catalyst is useful to produce syndiotatic styrene polymer having superior steroreguality, high melting point and broad molecular weight distribution with high activity together with a small amount of a cocatalyst. Further disclosed is a method for preparing styrene polymers using the same catalyst.

Abstract: Metal complexes comprising certain polydentate heteroatom containing ligands, catalysts, and coordination polymerization processes employing the same are suitably employed to prepare polymers having desirable physical properties.

Abstract: The present invention provides a method of forming a semiconducting device comprising an organic semiconducting material, which method comprises: heating a composition comprising the organic semiconducting material to a temperature at or above the melting point or glass transition temperature of the composition to form a melt; cooling the melt to a temperature below the melting point or glass transition temperature of the composition; and wherein a first substance or object capable of inhibiting and/or preventing dewetting is adjacent the composition before or during heating, or the composition further comprises an agent capable of inhibiting and/or preventing dewetting.

Abstract: Novel solid supported intermediate products of the general formula coupled to a solid polymeric support through one or both of the R1 groups or through the R4 group which are suitable for synthesis of heterocyclic compounds are disclosed. Methods for preparing such intermediate products are also disclosed and also the use of the intermediate products in simple and fast methods on solid phase for synthesis of heterocycles.

Abstract: It has been discovered that sequential polyperoxides can be beneficially used as initiators for vinylaromatic/diene copolymers to give high grafting values and reasonable molecular weights. A new cyclic diperoxide did not give these same results. The sequential polyperoxide initiators can be used as the only initiators or together with other conventional peroxide initiators to advantage. The polymerization rate can also be increased using these sequential polyperoxide initiators.

Abstract: A curable composition includes a functionalized poly(arylene ether), an alkenyl aromatic monomer, an acryloyl monomer, and a polymeric additive selected from polystyrene, poly(styrene-maleic anhydride), poly(styrene-methyl methacrylate), polybutene, poly(ethylene-butylene), poly(vinyl ether), poly(vinyl acetate), and combinations thereof. Curable compositions comprising polybutene having a number average molecular weight of greater than or equal to 300 atomic mass units form sol-gels having sol-gel transition temperatures of greater than about 60° C. These sol-gel compositions also exhibit lower tack at ambient temperature.

Abstract: A composition of matter formed by melt-blending certain thermoplastic polymers and from about 1.0 to about 7.5 wt. % of a fluorocarbon additive, the additive having a lower by surface energy than that of the polymer; the blending resulting in a cooled admixture having a concentration of fluorocarbon additive through a cross-section of the solid composition lower in the interior thereof and higher at the surfaces thereof.

Abstract: A masking member is provided that can be used repeatedly even for surface treatments at a high temperature. The masking member includes a plastic produced by polymerization using a metallocene compound as a catalyst or a polymer alloy containing such a plastic.

Abstract: An anionically polymerized impact-modified polystyrene has a yield stress of at least 24 MPa, measured at 23° C. to DIN 53455 and a hole impact strength of at least 11 kJ/m2, measured at 23° C. to DIN 53753, measured in each case on a specimen produced to ISO 3167. A preparation process is described.

Abstract: Process for the preparation of end-products based on vinylaromatic polymers with a predominantly syndiotactic structure which comprises: a) compressing the polymer in powder form in a mould at a pressure ranging from 0.1 to 500 Mpa; b) sintering the compressed powder, under pressure, at a temperature ranging from the glass transition temperature of the polymer (Tg) to 150° C.; c) slowly cooling the end-product to room temperature.

Abstract: An organic aluminoxy compound which shows 27Al nuclear magnetic resonance spectrum (27Al-NMR spectrum) having an A1/A2 ratio of at most 0.1, wherein A1 is area of a region encompassed by a segment of a line which connects a local minimum point existing between a continuous curve “a” containing a peak appearing at around 150 ppm and a continuous curve “b” containing a peak appearing at around 60 ppm to the point where the above curve “b” comes into contact with the base line and also by the above curve “b” and A2 is area of a region encompassed by the above curves “a” and “b” and also by the base line; an organic aluminoxy compound containing at least 5%, expressed in terms of aluminum atom, of a portion insoluble in a mixed solvent of toluene and hexane in a ratio by volume of 2:5 at 30° C. or lower; and a catalyst for producing a polymer comprising any of the above organic aluminoxy compounds and a transition metal compound.

Abstract: A process to produce a monovinylaromatic/monoolefin polymer is provided. Said monovinylaromatic/monoolefin polymer is provided.

Abstract: A process to produce a monovinylaromatic polymer is provided. Said monovinylaromatic polymer is provided.

Abstract: A catalyst for the polymerization of vinylaromatic monomers, and particularly styrene, with a high yield and a high syndiotacticity index, comprises the product consisting of the following two components in contact with each other: A) an &eegr;5-cyclopentadienyl complex of titanium; B) an organo-oxygenated compound of aluminum; and contains a sufficient amount of at least one carboxylated product having the following general formula: R—COO—G  (I) wherein R—COO is a carboxylic group comprising the organic radical R having from 1 to 30 carbon atoms, and G represents a hydrogen atom, an aliphatic or aromatic hydrocarbon group having from 1 to 20 carbon atoms or a metal atom, possibly substituted, linked to said carboxylic group.

Abstract: Process for the preparation of crystalline vinylaromatic polymers with a high degree of syndiotaxy which comprises polymerizing vinylaromatic monomers in the presence of a catalytic system essentially consisting of: a) a complex of titanium having the general formula: CpTiX1X2X3  (I) wherein Cp represents a cyclopentadienyl ligand whereas X1, X2, X3, the same or different, are selected from a halogen such as chlorine, or from alkyl groups, alkoxides, carboxylates, di(alkyl)amides; b) a polyalkylaluminoxane wherein the alkyl group contains from 1 to 8 carbon atoms; c) aluminum trifluoride.