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.