Abstract: A composition for asphalt modification which comprises (a) a block (co)polymer represented by general formula (I); (S-B)m-S?n (in formula (1), S and S? are each a polymer block mainly composed of an aromatic vinyl compound, B is a polymer block mainly composed of a conjugated diene, and m and n are each an integer of 0 or 1, provided that m+n is 1 or more), wherein the total combined aromatic vinyl compound content in the block (co) polymer is from more than 10% by weight to 100% by weight, and (b) a block copolymer represented by general formula (II); S-B-S, general formula (III); S-B-S? and/or general formula (IV); and (S-B)2-X (in formulas (II) to (IV), S, S? and B have the same meanings as given in general formula (I), and X is a residue of a coupling agent), at a block copolymer (a)/block copolymer (b) ratio (weight ratio) of 10-40/90-60.

Abstract: A crosslinked thermoplastic elastomer composition obtained by mixing 100 weight parts of at least one type of thermoplastic elastomer, 0-200 weight parts of a rubber-like polymer, and 1-50 weight parts of ultra fine carbon fibrils whose diameter is 3.5-70 nm and whose aspect ratio is greater than 5 against 100 weight parts of the combined mixture of the aforementioned elastomer and rubber like polymer.

Abstract: A medical device produced by molding a composition comprising (I) 10 to 50% by weight of a polyolefin resin (II) 1 to 89% by weight of a hydrogenated diene polymer obtained by hydrogenating not less than 90 mol % of a butadiene moiety of a linear or branched copolymer consisting of a polybutadiene block segment (C) having a 1,2-vinyl bond content of not more than 20 mol % and a block segment (D) of either polybutadiene or a vinyl aromatic compound-butadiene copolymer whose butadiene moiety has a 1,2-vinyl bond content in the range of from 25 to 95 mol % and having a block structure represented by C-(D-C).sub.n or (C-D).sub.

Abstract: A thermoplastic polymer composition consisting essentially of:(a) at least one member selected from the group consisting of a block copolymer consisting of a polymer block comprising at least 60% by weight of an alkenyl aromatic compound and a polymer block comprising at least 60% by weight of a conjugated diene compound and a hydrogenated product of said copolymer;(b) a thermoplastic polyurethane elastomer and(c) at least one member selected from the group consisting of the following (c-1) and (c-2) components:(c-1): a copolymer of an alkenyl aromatic compound with at least one compound selected from the group consisting of an unsaturated carboxylic acid and its derivative,(c-2): a modified (co)polymer obtained by reacting an isocyanate with a (co)polymer of at least one compound selected from the group consisting of an alkenyl aromatic compound and a conjugated diene compound; or a hydrogenated product of the modified (co)polymer or a mixture of the isocyanate-modified (co)polymer with the hydrogenated prod

Abstract: A block copolymer composition is provided comprising:(1) 10-60% by weight of a block copolymer [(A--B).sub.11 ].sub.m --Y.sub.1(2) 20-90% by weight of a block copolymer [(A--B).sub.12 ].sub.n --Y.sub.2, and(3) 0-50% by weight of a block copolymer (A--B.sub.13,in which A represents a vinyl aromatic polymer block having a molecular weight of 10,000-30,000 wherein the vinyl aromatic compound is selected from the group consisting of styrene, alkyl substituted styrene and a vinyl naphtalene, B.sub.1 a conjugated diene polymer block having a molecular weight of 25,000-100,000, B.sub.2 a conjugated diene polymer block having a molecular weight at least 1.2 times as high as that of B.sub.1 wherein the conjugated diene compound of B.sub.1 and B.sub.2 is a conjugated diene having four to eight carbon atoms per molecule, Y.sub.1 and Y.sub.2 respectively represent a halogenated, tetravalent silicon compound and a halogenated, tetravalent stannic compound and 11=1-3, m=2-4, 12=1-6, n=2-4 and 13=1-6.

Abstract: A block copolymer composition comprising40-85% by weight of a block copolymer A.sub.1 -B.sub.1 from an aromatic vinyl compound and a conjugated diene, respectively, A.sub.1 being <20% by weight of (A.sub.1 +B.sub.1), A.sub.1 and B.sub.1 having a molecular weight >12,000 and >150,000, respectively, and15-60% by weight of a block copolymer A.sub.2 -B.sub.2 -A.sub.3 from an aromatic vinyl compound, a conjugated diene and aromatic vinyl compound, respectively, A.sub.2 +A.sub.3 being >20% by weight of A.sub.2 +B.sub.2 +A.sub.3, A.sub.2 and A.sub.3 having a molecular weight >12,000 and(molecular weight of B.sub.2).ltoreq.(molecular weight of B.sub.1)/1.5. an adhesive composition comprising100 parts by weight (pbw) of said block copolymer composition, 20-300 pbw of a tackifying resin, and0-200 pbw of a softener, anda process for the preparation of said adhesive composition by mixing the components in question.

Abstract: Thermoplastic elastomer composition characterized by excellent oil resistance while preserving high tear resistance and tension pull resistance comprises non-functionalized block copolymer of aromatic vinyl compound and conjugated diene or selectively hydrogenated product thereof (e.g. styrene-butadiene-styrene block copolymer), rubber polymer having at least one functional group selected from the group consisting of carboxyl, amino, epoxy and hydroxyl (e.g. acrylonitrile-butadiene copolymer containing a carboxyl group as a reactive functional group), and reactive aromatic vinyl polymer having a functional group which is reactive with the functional group of the rubber (e.g. reactive polystyrene containing 1% by weight oxazolinyl group when the rubber polymer is carboxyl group containing acrylonitrile-butadiene copolymer).

Abstract: A thermoplastic elastomer composition which comprises 25-95% by weight of a polyamide and 75-5% by weight of a halogenated butyl rubber, a chlorosulfonated polyethylene or both thereof. Said composition is excellent in resistance to Freon gas permeation and has good oil resistance and low-temperature resistance. A hose wherein the layer to be contacted with a gas is made of the above thermoplastic elastomer composition is suitable as a Freon gas R-22 hose.

Abstract: A catalyst consisting essentially of (A) a cobalt compound and (B) an organic phosphorus compound represented by the formula: ##STR1## wherein R.sup.1 and R.sup.2 are independently hydrogen atoms, alkyl groups or aryl groups, and three X's, which may be the same or different, are electron-donating groups. This catalyst is effectively used in a process for producing a conjugated diene polymer by polymerizing a conjugated diene in a hydrocarbon or halogenated hydrocarbon solvent in the presence of the above catalyst together with (C) an organoaluminum compound and (D) 0.25-1.5 mols, per mol of the organoaluminum compound (C), of water.