Polyolefin based hot melt adhesive composition

A hot melt adhesive polyolefin composition having a viscosity of from 7,000 to less than 500,000 mPa·sec at 190° C. comprising by weight:

• I. 5-85% of a crystalline propylene polymer having an isotactic index from 80 to 98% and selected from the group consisting of a propylene homopolymer, a copolymer of propylene and ethylene or a C4-C10 α-olefin and blends thereof;
• II. 5-85% of a heterophasic polyolefin composition comprising (i) a crystalline propylene polymer and (ii) an amorphous copolymer of ethylene and propylene or a C4-C10 α-olefin or blends thereof, containing less than 40% ethylene;
• III. 10-75% of a material selected from the group consisting of aliphatic hydrocarbon resins, terpene/phenolic resin, polyterpenes, rosin, rosin esters and blends thereof;
• and
• IV. optionally, a mineral paraffinic or naphthalenic oil or an amorphous poly(α-olefin) having a viscosity lower than 10,000 mPa·sec at 190° C., or a mixture thereof.