Abstract: A rubber composition is disclosed containing an ethylene-propylene-nonconjugated diene copolymer rubber (or a blend of an ethylene-propylene-nonconjugated diene copolymer rubber and a diene rubber), a specific alkoxysilane compound, and amorphous silica powder having a specific surface area of 50 to 100 m2/g (BET adsorption). The vulcanized rubber is prepared by vulcanizing such a rubber composition. The rubber composition is excellent in dynamic characteristics and also in mechanical characteristics, dynamic fatigue resistance and thermal aging resistance. It also can provide a vulcanized rubber having the above-mentioned effects.
Abstract: The novel polyester (first polyester [A]) of the invention comprises dicarboxylic acid constituent units derived from at least one dicarboxylic acid selected from terephthalic acid, isophthalic acid and naphthalenedicarboxylic acid and diol constituent units derived from diols comprising ethylene glycol and a polyalkylene glycol having a C2-C10 alkylene chain, wherein the proportion of constituent units derived from the polyalkylene glycol is 0.001 to 10% by weight based on the diol constituent units. The polyester [A] has an excellent crystallization rate, is suitably used, singly or as compositions together with another polyester [B] and/or other polymers, for production of molded products such as films, sheets, laminates, preforms and bottles, which have excellent thermal, gas barrier and transparency properties.
September 11, 1997
Date of Patent:
November 26, 2002
Mitsui Petrochemical Industries, Ltd.
Koji Nakamachi, Masahiro Kouya, Shoji Hiraoka
Abstract: The present invention provides a multi-layer laminate consisting essentially of:(A) a layer formed from an ethylene/cycloolefin random copolymer which is a copolymer of ethylene and a cycloolefin represented by a specific formula (e.g., tetracyclododecene), or a layer formed from a cycloolefin resin which is a graft modified product of the ethylene/cycloolefin random copolymer, or a layer formed from a cycloolefin resin composition comprising the cycloolefin resin and a polyolefin, and(B) a barrier layer consisting essentially of ethylene/vinyl alcohol copolymer, polyvinylidene chloride, or polyacrylonitrile, with the barrier layer having an oxygen permeability, as measured at 23.degree. C. and RH of 0%, of not more than 10 cc(STP).mm/m.sup.2.24 hr.atm; said multi-layer laminate having a moisture permeability of not more than 0.2 g.mm/m.sup.2.24 hr.atm and an oxygen permeability of not more than 5 cc(STP).mm/m.sup.2.24 hr.atm. This multi-layer laminate has excellent gas-barrier properties and high rigidity.
Abstract: A process for producing an aromatic polyamide which comprises:(a) a dicarboxylic acid component which consists of 30-100 mol % of terephthalic acid and optionally 0-70 mol % of at least one dicarboxylic acid other than terephthalic acid, and(b) a diamine component which consists of 50-100 mol % of an aliphatic alkylenediamine of 4-25 carbons and optionally 0-50 mol % of at least one alicyclic diamine of 3-25 carbons, said process comprising a first step of performing melt reaction of said dicarboxylic acid with said diamine, thereby giving a low molecular weight condensate having an intrinsic viscosity [.eta.] of 0.05-0.6 dl/g, a second step of subjecting it to solid phase polymerization, thereby giving an aromatic polyamide precursor having an intrinsic viscosity [.eta.] of 0.5-1.0 dl/g, and a third step of subjecting it to melt polymerization, thereby giving an aromatic polyamide having a desired intrinsic viscosity [.eta.] of 0.8-2.5 dl/g.
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: A thermal fixing developer material for electrophotography is provided. This developer material is adapted for use as a main component of an electrostatic toner, and the toner produced by using this developer material exhibits excellent release properties upon thermal fixing, and in particular, upon thermal fixing at low temperature, and therefore, is free from offset and contamination of carrier, photosensitive material, heat roller, and the like. Such a toner is also provided with high blocking resistance. The developer material of this invention comprises a wax of a propylene-based copolymer having a particular molecular weight, a particular melting point, and a particular compositional distribution.
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 same by polymerizing ethylene in the presence of an ethylene polymerization catalyst comprising a solid titanium catalyst component containing titanium, magnesium, halogen and a compound having at least two ether linkages present through plural atoms with an organometallic compound catalyst component.
Abstract: Disclosed is a solid titanium catalyst component for olefin polymerization comprising magnesium, titanium, halogen, and (C) a phthalic diester represented by the following structural formula (i): ##STR1## wherein R is a branched hydrocarbon group of 7 carbon atoms, and two or R may be the same as or different from each other. Also disclosed are a process for preparing the solid titanium catalyst component, an olefin polymerization catalyst containing said solid titanium catalyst component and a process for olefin polymerization using the olefin polymerization catalyst. According to the present invention, the olefin polymer having high stereoregularity can be produced in a prominently high yield per catalyst unit.
Abstract: The novel acrylic ester, allyl ether and allyl carbonate of the present invention are characterized by having the structures represented by the following general formulae (I) to (IV): The above acrylic ester, allyl ether and allyl carbonate are used as a starting monomer which forms a polymer matrix for use in a polymeric solid electrolyte. The novel polymer of the present invention comprises structural units derived from at least one compound selected from a group of the compounds represented by the above general formulae (I) to (IV). The polymeric solid electrolyte comprising the above novel polymer as a polymer matrix exhibits high ionic conductivity and is chemically stable.
Abstract: The refillable polyester bottle of the invention has a mean crystallinity of 32 to 70% at the bottle body, a methanol adsorption of 1,500 ppm or less at the same portion and a paraxylene adsorption of 300 ppm or less at the same portion. Therefore, the bottle is excellent in non-adsorptivity and heat resistance. According to the method of removing adsorbates on a polyester bottle of the invention, the adsorbates can be rapidly desorbed by holding the bottle in air of 40 to 150.degree. C. or bringing the bottle into contact with water or water vapor heated at 40 to 150.degree. C.
Abstract: The thin-film electroluminescent device of the present invention comprises a thin film of a polyoxadiazole derivative represented by the formula: ##STR1## wherein each of X.sub.0 and Y.sub.0 independently represents a divalent organic group which may comprise a silicon atom, and n is an integer of 2 or greater,formed as an electroluminescent layer or a charge injecting/transporting layer between electrodes, at least one thereof being transparent. This thin-film electroluminescent device is excellent not only in electroluminescence and capability of charge injection/transport to thereby ensure high light emission efficiency but also in durability such as heat resistance.
Abstract: A process for removing a diol from a cyclic carbonic acid ester containing the diol as an impurity, which comprises bringing a cyclic carbonic acid ester containing a diol as an impurity into contact with a synthetic zeolite in the presence of a chain carbonic acid ester. According to this process, there can be obtained a mixture of a cyclic carbonic acid ester and a chain carbonic acid ester having a very small content of diol, which is suitable as a solvent for electrolytic solution of a condenser, cell or battery.
Abstract: Disclosed is an olefin polymerization catalyst comprising (A) a transition metal compound represented by the formula (I) R.sup.1 R.sup.2 MX.sub.2 (wherein M is a transition metal atom, R.sup.1 and R.sup.2 are each a cycloalkadienyl group having an aryl group and a saturated hydrocarbon group as substituents, and X is a halogen atom or the like) and (B) at least one compound selected from (b1) an organoaluminum oxy-compound, (b2) an ionized ionic compound and (b3) an organoaluminum compound. Also disclosed is a process for olefin polymerization comprising polymerizing an olefin in the presence of the above-mentioned catalyst. According to the present invention, an olefin copolymer having a crystallization temperature and a melting point both lower than those of the conventional copolymers can be prepared in the case of that the feeding amount of comonomer is smaller than those conventionally used.
Abstract: The ethylene/.alpha.-olefin/nonconjugated polyene copolymer rubber composition of the present invention comprises in specified proportions a crystalline polyolefin resin (A) and an ethylene/.alpha.-olefin/nonconjugated polyene copolymer rubber (B) composed of ethylene, an .alpha.-olefin having 3 to 20 carbon atoms and a specific branched chain polyene compound. The molar ratio of ethylene units to .alpha.-olefin units, iodine value and intrinsic viscosity ?.eta.! of the ethylene/.alpha.-olefin/nonconjugated polyene copolymer rubber (B) are within respective specified ranges. This rubber composition is excellent in low temperature properties. When the above olefinic thermoplastic elastomer composition is partially or entirely crosslinked, a molding can be provided which is superior to the conventional vulcanized rubbers in low temperature properties, tensile strength, elongation at break and rubber properties.
Abstract: The present invention relates to a process for preparing a cycloolefin copolymer by polymerization of at least one cyclic olefin and at least one acyclic olefin in the presence of a catalyst comprising at least one metallocene compound of the formula I, ##STR1## where L is a .pi.-ligand, L' is a .pi.-ligand, T is a bridge between L and L', M is a tetravalent transition metal, m is 1 or 2 and R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are, independently of one another, identical or different and are each a hydrogen atom or a C.sub.1 -C.sub.20 -hydrocarbon radical.
Abstract: Disclosed in an olefin polymerization catalyst comprising a transition metal compound having at least two transition metals in which at least one of said metals is bonded to a ligand having a cyclopentadienyl skeleton, at least one of said metals is selected from Sc, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W and lanthanoid metals and at least on of the others is selected from the specific transition metals; and an organoaluminum oxy-compound or an organoboron compound. Corresponding to the kind of the metal combined with said metal selected from Sc, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W and lanthanoid metals, the olefin polymerization catalyst exhibit a property to give polymers having a wide molecular weight distribution in spite of the catalyst system using one kind of a transition metal compound, or to give polymers having high molecular weight and be excellent in the polymerization activity at low polymerization temperature.
Abstract: Disclosed is a novel transition metal compound represented by the following formula: ##STR1## wherein M is a transition metal, X is halogen or the like, R.sup.1 is a hydrocarbon group or the like, R.sup.2 is an aryl group substituted with a halogenated hydrocarbon group, and Y is a divalent silicon-containing group or the like.Also disclosed are an olefin polymerization catalyst component comprising the transition metal compound, an olefin polymerization catalyst comprising the olefin polymerization catalyst component, and a process for olefin polymerization using the olefin polymerization catalyst.An olefin polymerization catalyst component having high polymerization activity can be formed from the transition metal compound. By the use of the olefin polymerization catalyst or the process for olefin polymerization, polyolefins having a high melting point and a high molecular weight can be prepared with high polymerization activity.
Abstract: The thermoplastic elastomer composition of the invention comprises a crystalline polyolefin resin (A), an olefin rubber (B), a hydrogenated styrene block copolymer (C), a softener (D), and optionally, a peroxide non-crosslinked type hydrocarbon rubber (E) in a specific amount of each, and has a gel content of not less than 97%. This composition may be mixed with a crystalline polyolefin resin. The thermoplastic elastomer composition has excellent moldability and is able to provide a molded product having excellent elastomeric properties, high resistance to permanent compression set and good appearance. In particular, a composition obtained by mixing this thermoplastic elastomer composition and a crystalline polyolefin resin shows excellent moldability.
Abstract: A crystalline thermoplastic resin composition comprises a rosin acid metallic salt and a crystalline thermoplastic resin. Optionally, a compatibilizing agent may also be included. The rosin acid metallic salt, which acts as a crystal nucleating agent, increases the crystallization rate of the crystalline thermoplastic resin and enables the formation of fine crystals of the resin. Thus, the crystalline thermoplastic resin composition can crystallize at a high rate, and provide molded articles having excellent mechanical properties and/or optical properties.
January 22, 1997
Date of Patent:
January 5, 1999
Mitsui Petrochemicals Industries, Ltd., Arakawa Chemical Industries, Ltd.
Hideki Sakai, Mikio Nakagawa, Tetsuji Kasai, Kimio Ueda, Masao Maeda, Yukiharu Yamada, Hiroyuki Hori, Junji Tan, Kan Matsumoto