Abstract: A modified block copolymer composition comprising a thermoplastic polymer and a modified block copolymer consisting essentially of a base block copolymer of a monovinyl substituted aromatic hydrocarbon polymer block and an olefin compound polymer block having an ethylenic unsaturation degree not exceeding 20%, the base block copolymer having a molecular unit containing a carboxylic acid group and/or a group derived therefrom grafted thereto. The modified block copolymer composition of the present invention is a resinous composition excellent in impact resistance, adhesion, paint adhesion, weatherability, resistance to thermal deterioration, transparency and gloss or a rubbery or leather-like composition excellent in heat resistance, adrasion resistance, compression set resistance, adhesion, transparency, oil resistance, weatherability and resistance to heat aging.

Abstract: A modified block copolymer composition comprising a thermoplastic polymer and a modified block copolymer consisting essentially of a base block copolymer of a monovinyl substituted aromatic hydrocarbon polymer block and an olefin compound polymer block having an ethylenic unsaturation degree not exceeding 20%, the base block copolymer having a molecular unit containing a carboxylic acid group and/or a group derived therefrom grafted thereto. The modified block copolymer composition of the present invention is a resinous composition excellent in impact resistance, adhesion, paint adhesion, weatherability, resistance to thermal deterioration, transparency and gloss or a rubbery or leather-like composition excellent in heat resistance, adrasion resistance, compression set resistance, adhesion, transparency, oil resistance, weatherability and resistance to heat aging.

Abstract: A thermoplastic polymer composition(a) 10 to 95 parts by weight of a block copolymer which comprises at least two polymer segments comprised primarily of a vinyl aromatic hydrocarbon and at least one polymer segment comprised primarily of a conjugated diene, in which:(i) the content of the vinyl aromatic hydrocarbon is more than 60% by weight and 95% by weight;(ii) the weight ratio of the vinyl aromatic hydrocarbon present in the copolymer as the vinyl aromatic hydrocarbon polymer block to the total vinyl aromatic hydrocarbons present in the copolymer is more than 0.75% to 0.98%; and(iii) the ratio of the weight average molecular weight to the number average molecular weight of the vinyl aromatic hydrocarbon polymer block in the copolymer is 1.2 to 2.0 and(b) 5 to 90% by weight of polyphenylene ether, and, optionally,(c) 3 to 400 parts by weight, based on 100 parts by weight of the total weight of said components (a) and (b), of polystyrene.

Abstract: A modified block copolymer composition comprising a thermoplastic polymer and a modified block copolymer consisting essentially of a base block copolymer of a monovinyl substituted aromatic hydrocarbon polymer block and an olefin compound polymer block having an ethylenic unsaturation degree not exceeding 20%, the base block copolymer having a molecular unit containing a carboxylic acid group and/or a group derived therefrom grafted thereto. The modified block copolymer composition of the present invention is a resinous composition excellent in impact resistance, adhesion, paint adhesion, weatherability, resistance to thermal deterioration, transparency and gloss or a rubbery or leather-like composition excellent in heat resistance, adrasion resistance, compression set resistance, adhesion, transparency, oil resistance, weatherability and resistance to heat aging.

Abstract: A terminal-modified block copolymer having the remainder of an amino group or imido group-containing a terminal-treating agent bonded to the polymer terminal which is obtained by treating the active terminal of a block copolymer comprising conjugated dienes and vinylaromatic hydrocarbon compounds, which is obtained by using as the polymerization initiator at least one member selected from alkali metals or organoalkali metals and has a vinylaromatic hydrocarbon content of 5 to 95% by weight and a number average molecular weight of 5,000 to 1,000,000 with at least one terminal-treating agent selected from imide compounds, cyanamide compounds, aziridinyl compounds, amide compounds, or tertiary amino group-containing compounds other than the compounds.

Abstract: A composition comprising,(a) 1 to 99 parts by weight of a specific hydrogenated product of a block copolymer having at least one polymer block composed mainly of a vinyl aromatic compound and at least one polymer block composed mainly of a conjugated diene compound, a modified product which comprises said product modified with an .alpha.,.beta.-unsaturated carboxylic acid or a derivative thereof, or a mixture of said product and said modified product, wherein the content of the vinyl aromatic compound prior to hydrogenation is 5 to 95% by weight and a content of vinyl linkages [V] prior to hydrogenation which originated from the conjugated diene compound is 10 to 80%, said product satisfying the following conditions;(1) the hydrogenated ratio [A] of the total of aliphatic double bonds which originated from the conjugated diene compound is not lower than 5% and lower than 50%, and[B]/[V].sup.

Abstract: A modified block copolymer composition comprising a thermoplastic polymer and a modified block copolymer consisting essentially of a base block copolymer of a monovinyl substituted aromatic hydrocarbon polymer block and an olefin compound polymer block having an ethylenic unsaturation degree not exceeding 20%, the base block copolymer having a molecular unit containing a carboxylic acid group and/or a group derived therefrom grafted thereto. The modified block copolymer composition of the present invention is a resinous composition excellent in impact resistance, adhesion, paint adhesion, weatherability, resistance to thermal deterioration, transparency and gloss or a rubbery or leather-like composition excellent in heat resistance, abrasion resistance, compression set resistance, adhesion, transparency, oil resistance, weatherability and resistance to heat aging.

Abstract: A modified block copolymer composition comprising a thermoplastic polymer and a modified block copolymer consisting essentially of a base block copolymer of a monovinyl substituted aromatic hydrocarbon polymer block and an olefin compound polymer block having an ethylenic unsaturation degree not exceeding 20%, the base block copolymer having a molecular unit containing a carboxylic acid group and/or a group derived therefrom grafted thereto. The modified block copolymer composition of the present invention is a resinous composition excellent in impact resistance, adhesion, paint adhesion, weatherability, resistance to thermal deterioration, transparency and gloss or a rubbery or leather-like composition excellent in heat resistance, abrasion resistance, compression set resistance, adhesion, transparency, oil resistance, weatherability and resistance to heat aging.

Abstract: A modified block copolymer composition comprising a thermoplastic polymer and a modified block copolymer consisting essentially of a base block copolymer of a monovinyl substituted aromatic hydrocarbon polymer block and an olefin compound polymer block having an ethylenic unsaturation degree not exceeding 20%, the base block copolymer having a molecular unit containing a carboxylic acid group and/or a group derived therefrom grafted thereto. The modified block copolymer composition of the present invention is a resinous composition excellent in impact resistance, adhesion, paint adhesion, weatherability, resistance to thermal deterioration, transparency and gloss or a rubbery or leather-like composition excellent in heat resistance, abrasion resistance, compression set resistance, adhesion, transparency, oil resistance, weatherability and resistance to heat aging.

Abstract: An adhesive composition comprising100 parts by weight of a block copolymer (a) containing of at least one polymer block composed mainly ofa vinyl aromatic hydrocarbon and at least one polymer block composed mainly of butadiene in which(i) the vinyl aromatic hydrocarbon content [S] is 10 to 30% by weight,(ii) the 1,2-vinyl content of butadiene portion [V] is 20 to 50%, and(iii) the relationship between said vinyl aromatic hydrocarbon content [S] and said 1,2-vinyl content of butadiene portion [V] satisfies the formula,:40.ltoreq.[S]+[V].ltoreq.7040 to 200 parts by weight of a tackifier (b), and, optionallyvarious stabilizers, and a process for producing said composition.

Abstract: A modified block copolymer composition comprising a thermoplastic polymer and a modified block copolymer consisting essentially of a base block copolymer of a monovinyl substituted aromatic hydrocarbon polymer block and an olefin compound polymer block having an ethylenic unsaturation degree not exceeding 20%, the base block copolymer having a molecular unit containing a carboxylic acid group and/or a group derived therefrom grafted thereto. The modified block copolymer composition of the present invention is a resinous composition excellent in impact resistance, adhesion, paint adhesion, weatherability, resistance to thermal deterioration, transparency and gloss or a rubbery or leather-like composition excellent in heat resistance, abrasion resistance, compression set resistance, adhesion, transparency, oil resistance, weatherability and resistance to heat aging.

Abstract: A modified block copolymer composition comprising a thermoplastic polymer and a modified block copolymer consisting essentially of a base block copolymer of a monovinyl substituted aromatic hydrocarbon polymer block and an olefin compound polymer block having an ethylenic unsaturation degree not exceeding 20%, the base block copolymer having a molecular unit containing a carboxylic acid group and/or a group derived therefrom grafted thereto. The modified block copolymer composition of the present invention is a resinous composition excellent in impact resistance, adhesion, paint adhesion, weatherability, resistance to thermal deterioration, transparency and gloss or a rubbery or leather-like composition excellent in heat resistance, adrasion resistance, compression set resistance, adhesion, transparency, oil resistance, weatherability and resistance to heat aging.

Abstract: A modified block copolymer composition comprising a thermoplastic polymer and a modified block copolymer consisting essentially of a base block copolymer of a monovinyl substituted aromatic hydrocarbon polymer block and an olefin compound polymer block having an ethylenic unsaturation degree not exceeding 20%, the base block copolymer having a molecular unit containing a carboxylic acid group and/or a group derived therefrom grafted thereto. The modified block copolymer composition of the present invention is a resinous composition excellent in impact resistance, adhesion, paint adhesion, weatherability, resistance to thermal deterioration, transparency and gloss or a rubbery or leather-like composition excellent in heat resistance, abrasion resistance, compression set resistance, adhesion, transparency, oil resistance, weatherability and resistance to heat aging.

Abstract: A block copolymer containing two or more polymer blocks composed mainly of an aromatic vinyl hydrocarbon and one or more polymer blocks composed mainly of a conjugated diene having excellent mechanical properties can be advantageously prepared by (a) batchwise preparing the specified living polymer (i.e. prepolymer) of at least one aromatic vinyl hydrocarbon polymer block by using a portion of monomers, and, then, (b) continuously preparing the block copolymer for continuously polymerizing the remainder of the monomers by continuously supplying the prepolymer to the first polymerization vessel of a continuous polymerization zone and simultaneously supplying the remainder of the monomers in the form of a monomer composed mainly of the aromatic vinyl hydrocarbon and/or a monomer composed mainly of the conjugated diene continuously and separately to the subsequent polymerization vessel(s).

Abstract: A block copolymer containing two or more polymer blocks composed mainly of an aromatic vinyl hydrocarbon and one or more polymer blocks composed mainly of a conjugated diene having excellent mechanical properties can be advantageously prepared by (a) batchwise preparing the specified living polymer (i.e. prepolymer) of at least one aromatic vinyl hydrocarbon polymer block by using a portion of monomers, and, then, (b) continuously preparing the block copolymer for continuously polymerizing the remainder of the monomers by continuously supplying the prepolymer to the first polymerization vessel of a continuous polymerization zone and simultaneously supplying the remainder of the monomers in the form of a monomer composed mainly of the aromatic vinyl hydrocarbon and/or a monomer composed mainly of the conjugated diene continuously and separately to the subsequent polymerization vessel(s).

Abstract: A film, sheet, or tube having an excellent low-temperature shrinkage suitable for use as, for example, a heat shrinkable label is disclosed. This film, sheet, or tube contains, as a base polymer, a block copolymer of an aromatic vinyl hydrocarbon polymer block and a polymer block composed mainly of a conjugated diene having the following structure:______________________________________ (a) (AB).sub.n n = 2-10 (b) A(BA).sub.n n = 2-10 (c) B(AB).sub.n n = 2-10 (d) [(BA).sub.n ].sub.m+2X n = 2-10 and m = 1-10 (e) [(AB).sub.n ].sub.m+2X n = 2-10 and m = 1-10 (f) [(BA).sub.nB].sub.m+2X n = 1-10 and m = 1-10, or (g) [(AB).sub.nA].sub.

Abstract: In producing a block copolymer resin having vinyl aromatic hydrocarbon polymer blocks such as of styrene and polymer blocks primarily composed of conjugated diene such as of butadiene successively through living polymers using an organolithium compound as a catalyst in an aliphatic solvent, the vinyl aromatic hydrocarbon monomer for forming the vinyl aromatic hydrocarbon polymer block is added at a controlled rate, at the stage when the vinyl aromatic hydrocarbon content in the polymer formed has reached a certain value, higher than the polymerization rate of the vinyl aromatic hydrocarbon monomer at the polymerization temperature but at a rate which can maintain the solubility parameter of the liquid phase portion in the polymerization system at 7.7 or less, whereby a block copolymer resin with good transparency and impact strength can be produced with good productivity.

Abstract: An alkenyl aromatic resin composition having an excellent impact strength, which comprises (I) 100 parts by weight of a rubber-modified alkenyl aromatic resin containing from 2 to 35 wt. % of conjugated diolefin components, or a resinous mixture containing at least a component of the resin thereof; and (II) 1 to 50 parts by weight of a random segment copolymer containing at least a Segment A which is a random copolymer of a conjugated diolefin and a vinyl-substituted aromatic compound with a weight ratio being ranging from 30:70 to 5:95 and at least a Segment B, which is a conjugated diolefin polymer or a random copolymer of a conjugated diolefin and a vinyl-substituted aromatic compound with a weight ratio being ranging from 100:0 to 75:25, the random segment copolymer being characterized by containing;(a) at least 10 wt. % of Segment A based on the total random segment copolymer,(b) at least 20 wt. % of Segment B based on the total random segment copolymer, and(c) at least 60 wt.