Abstract: The present invention provides a composite resin composition comprises A) polypropylene-based resin by 100 weight portions, (B) organized denatured clay by 0.1 to 50 weight portions, and (C) maleic anhydride denatured polypropylene by 0.5 to 30 weight portions, in which the maleic anhydride denatured polypropylene satisfies the following conditions that the quantity of not-reacted maleic anhydride is outside a limit for quantitative analysis; that the percentage of acid content against a number of polymer chains is not less than 0.8 and not more than 2.0; that the molecular weight distribution is not less than 2.5; that the percentage of components with the molecular weight of 10,000 or less is not more than 0.5% by weight; and that the ultimate viscosity (&eegr;) is 1 or more. A supercritical gas is infiltrated in this composite resin composition for degassing to obtain resin foam. With the operations above, bubbles are formed finely and homogeneously at the high density and high solidity is provided.

Abstract: Long-chain, branched, propylene-based polymers, of which the melt index and the molecular weight distribution and the melt tension and the limiting viscosity both satisfy specific requirements, have good physical properties that are comparable to or better than those of conventional propylene-based polymers. They have good melt workability and are favorable to large-size blow molding and extrusion foaming. They are favorably used as miscibility improvers for propylene homopolymers and propylene-based copolymers.

Abstract: Provided are an aluminium-oxy compound obtained through reaction of an organoaluminium compound with water, which is soluble in hydrocarbon solvents and in which the amount of the organoaluminium compound remaining is at most 10% by weight; a carrier comprising the aluminium-oxy compound and an inorganic compound; and a catalyst component for olefin polymerization comprising the carrier and a transition metal compound. The catalyst component for olefin polymer production comprises the aluminium-oxy compound and gives polyolefins with good polymer morphology.

Abstract: Long-chain, branched, propylene-based polymers, of which the melt index and the molecular weight distribution and the melt tension and the limiting viscosity both satisfy specific requirements, have good physical properties that are comparable to or better than those of conventional propylene-based polymers. They have good melt workability and are favorable to large-size blow molding and extrusion foaming. They are favorably used as miscibility improvers for propylene homopolymers and propylene-based copolymers.

Abstract: Long-chain, branched, propylene-based polymers, of which the melt index and the molecular weight distribution and the melt tension and the limiting viscosity both satisfy specific requirements, have good physical properties that are comparable to or better than those of conventional propylene-based polymers. They have good melt workability and are favorable to large-size blow molding and extrusion foaming. They are favorably used as miscibility improvers for propylene homopolymers and propylene-based copolymers.

Abstract: A novel double crosslinking type transition metal compound is herein disclosed which is represented by the general formula (I) wherein M is a metallic element in the groups 3 to 10 or a lanthanoide series of the periodic table; E1 and E2 are each a cyclopentadienyl group, an indenyl group or the like, and they form a crosslinking structure via A1 and A2; A1 and A2 are each a crosslinking group comprising a hydrocarbon group of one or more carbon atoms; X is a &sgr;-bonding ligand; and Y is a Lewis base. Also disclosed are a double crosslinking type biscyclopentadienyl derivative and bisindenyl derivative for use in the above-mentioned transition metal compound, its preparation process, a catalyst for olefin polymerization using the transition metal compound, and a preparation process of an olefin polymer by the use of this catalyst.

Abstract: In olefin polymer production, for which is used a metallocene-type catalyst having a double-crosslinked indenyl or substituted indenyl group, a small amount of hydrogen is added to the polymerization system. Concretely, hydrogen is added thereto so that the hydrogen concentration in the olefin being polymerized could be from 0.01 to 10 mol % or hydrogen could be in the polymerization system in an amount of from 10 to 20000 mols relative to one mol of the transition metal in the metallocene-type catalyst. Hydrogen added to the olefin polymer production system enhances the polymerization activity of the catalyst used, and the catalyst could exhibit high activity in the presence of hydrogen.

Abstract: Provided are an ethylene homopolymer having well-balanced properties of good heat resistance, good heat-sealability and good moldability, and its molded articles. The ethylene homopolymer is characterized in that the number of butyl branches per 100 methyl branches therein falls between 1 and 20, as measured through 13C-NMR, that its density, d (kg/m3), falls between 880 and 980, and that the density, d, and its melting point, Tm (° C.) , satisfy the conditions defined by the following formulae (1) to (3): Tm≧1.2×d−982 (980≧d≧925)  (1), Tm≧0.6×d−430 (925>d≧915)  (2), Tm≧0.16×d−28.4 (915>d≧880)  (3). The ethylene homopolymer is molded into moldings.

Abstract: A process for efficiently preparing an unsaturated dicarboxylic acid diester, which comprises reacting a conjugated diene, carbon monoxide, an alcohol and oxygen in the presence of a catalyst comprising (a) a platinum metal, a salt thereof or a complex compound of a platinum metal, (b) at least one metal salt selected from the group consisting of a copper salt, an iron salt and a manganese salt and (C) at least one compound selected from the group consisting of (1) an alkali metal compound or an alkaline earth metal compound, (2) a rare earth metal compound, (3) a metal compound of the groups IIIA, IVA, IVB, VA, VB or VIA, and (4) a metal carbonyl complex. The unsaturated dicarboxylic acid diester is useful as an intermediate material in industrial chemical processes and can be efficiently prepared without the use of a dehydrating agent.