Abstract: Disclosed is a hot-melt adhesive composition comprising (a) 20 to 70 parts by weight of a vinyl aromatic compound/conjugated diene copolymer or a hydrogenation product thereof, (b) 30 to 80 parts by weight of an alicyclic hydrocarbon resin tackifier, the total amount of the components (a) and (b) being 100 parts by weight, and (c) 0.3 to 20 parts by weight of a random copolymer of a cyclic olefin and ethylene.

Abstract: A hot melt adhesive composition which comprises:(a) a copolymer of vinyl aromatic compounds and conjugated dienic compounds, or a hydrogenated version thereof in amounts of about 20-70% by weight;(b) a tackifier comprising alicyclic hydrocarbon polymers in amounts of about 30-80% by weight; and(c) a 4-methylpentene-1 polymer in amounts of about 0.3-20% by weight, based on the composition, respectively.

Abstract: A polymer composition comprising:(A) 15 to 40% by weight of a hydrogenated product of a block copolymer comprising a vinyl aromatic compound (a.sub.1) and a conjugated diene compound (a.sub.2),(B) 4 to 30% by weight of an isopropenyltoluene polymer comprising meta-iso-propenyltoluene as the main constituting unit, and(C) 40 to 80% by weight of a compound selected from the group consisting of .alpha.-olefin polymers (c.sub.1) having a number average molecular weight ranging from 250 to 5000 and squalane (c.sub.2), wherein the total amount of the components (A), (B) and (C) is 100% by weight.