Hot melt adhesive

An absorbent article comprising a liquid permeable interior layer, a liquid impervious exterior layer, and an absorbent layer therebetween, wherein the absorbent article further comprises a hot melt adhesive composition comprising:

• from about 10 wt. % to about 90 wt. % of an amorphous polyolefin composition comprising a random butane-α-olefin copolymer, the random butane-α-olefin copolymer comprising from about 30 mole % to about 70 mole % of 1-butene monomer units, wherein the amorphous polyolefin composition has a viscosity from about 2000 mPa·s to about 8000 mPa·s when measured by ASTM D3236 at 190° C.;
• and
• from about 10 wt. % to about 90 wt. % of a heterophase polyolefin copolymer composition comprising a first set of comonomer units and a second set of comonomer units, wherein the first set of comonomer units are propene, and wherein the second set of comonomer units are selected from the group consisting of ethylene, 1-hexene, 1-octene, and amorphous blocks and crystalline blocks;
• wherein the hot melt adhesive composition is substantially tackifier-free;
• wherein the hot melt adhesive has a density of less than 0.9 g-cm−3;
• and
• wherein the hot melt adhesive composition has a softening point from about 80° C. to 140° C. when measured using ASTM D 3461-97.

An absorbent article comprising a liquid permeable interior layer, a liquid impervious exterior layer, and an absorbent layer therebetween, wherein the absorbent article further comprises a hot melt adhesive composition comprising:

• from about 10 wt. % to about 90 wt. % of an amorphous polyolefin composition comprising a random butane-α-olefin copolymer, the random butane-α-olefin copolymer comprising from about 30 mole % to about 70 mole % of 1-butene monomer units, wherein the amorphous polyolefin composition has a viscosity from about 2000 mPa·s to about 8000 mPa·s when measured by ASTM D3236 at 190° C.;
• from about 10 wt. % to about 90 wt. % of a heterophase polyolefin copolymer composition comprising a first set of comonomer units and a second set of comonomer units, wherein the first set of comonomer units are propene, and wherein the second set of comonomer units are selected from the group consisting of ethylene, 1-hexene, 1-octene, and amorphous blocks and crystalline blocks;
• and
• an antioxidant;
• wherein the hot melt adhesive composition has a softening point from about 80° C. to 140° C. when measured using ASTM D 3461-97;
• wherein the hot melt adhesive has a density of less than 0.9 g-cm−3;
• and
• wherein the adhesive is substantially free of a tackifier.