ADHESIVES

摘要

This invention relates to an adhesive including (a) a copolymer including butene, at least 40 mol % propylene, and from 0 to 30 mol % of a termonomer selected from ethylene and C5 to C20 linear, branched or cyclic alpha olefins, wherein the copolymer has (i) a weight average molecular weight of 100,000 or less; (ii) a number average molecular weight of 20,000 or less; (iii) an Mw/Mn of 5 or more; and (iv) a viscosity of 8000 mPa.sec or less at 190 °C; and (b) a hydrocarbon resin, and/or (c) a polypropylene having at least 30% crystallinity having a viscosity of 1500 mPa.s or less at 190 °C, or a tactic polypropylene having a viscosity of 1500 mPa.s or less at 190 °C, provided that if the tactic polypropylene is not present, then the hydrocarbon resin is a cyclopentadiene-based hydrocarbon resin. This invention also relates to blends of the copolymer described above and isotactic polypropylene without hydrocarbon resin.