Patent ID: 8563138

Claim:
A polypropylene-based adhesive having an MFR of 2.7 g/10 min or higher as measured at 230° C. under a load of 2.16 kg, consisting essentially of a composition which comprises 5-95 parts by weight of (A) an isotactic polypropylene, 95-5 parts by weight of (B) a propylene/ethylene random copolymer, and 0-40 parts by weight of (C) an ethylene/propylene random copolymer (where the sum of the contents of the isotactic polypropylene (A), propylene/ethylene random copolymer (B), and ethylene/propylene random copolymer (C) is 100 parts by weight), wherein 100 parts by weight of the composition is graft modified with 0.001-5 parts by weight of an unsaturated carboxylic acid and/or a derivative thereof, and wherein (B) is characterized by the following (i) to (iii): (i) the propylene/ethylene random copolymer (B) contains 60-90 mol % units derived from propylene and 10-40 mol % units derived from ethylene, (ii) the melting point (Tm) as measured with a differential scanning calorimeter is in the range of 40-120° C., and (iii) the molecular weight distribution (Mw/Mn) as determined by gel permeation chromatography (GPC) is in the range of 1.0-3.0, wherein the ethylene/propylene random copolymer (C) is absent when the amount of isotactic polypropylene (A) is 50 parts by weight or more, or the ethylene/propylene random copolymer (C) is present in an amount of 1-40 parts by weight when the amount of isotactic polypropylene (A) is less than 50 parts by weight, wherein the ethylene/propylene random copolymer (C) contains 60-90 mol % of units derived from ethylene and 10-40 mol % of units derived from propylene.