Hot melt adhesive composition with ethylene/α-olefin multi-block copolymer
The present disclosure is directed to a hot melt adhesive composition including: a) an ethylene/α-olefin multi-block copolymer having a weight molecular weight (Mw) less than 20,000; b) a tackifier having a softening temperature from 90° C. to 150° C.; and c) a wax.
1. A hot melt adhesive composition comprising:
a) an ethylene/α-olefin multi-block copolymer having a weight average molecular weight (Mw) less than 20,000;
b) a tackifier having a softening temperature from 90° C. to 150° C.;
c) a wax; and
wherein the composition has a PAFT from 30° C. to 50° C. and a SAFT from 65° C. to 85° C.
2. The composition of claim 1 wherein the ethylene/α-olefin multi-block copolymer comprises from 25 wt % to 35 wt % hard segments and from 65 wt % to 75 wt % soft segments and the soft segments comprise from 10 mol % to 15 mol % α-olefin.
3. The composition of claim 1 wherein the α-olefin is octene and the ethylene/octene multi-block copolymer has a density from 0.86 g/cc to 0.89 g/cc and a melt temperature, Tm, from 80° C. to 100° C.
4. The composition of claim 1 wherein the ethylene/α-olefin multi-block copolymer has a Brookfield viscosity at 177° C. from 500 centipoise to 10,000 centipoise.
5. The composition of claim 1 wherein the ethylene/α-olefin multi-block copolymer has a melt index from 100 g/10 min to 2000 g/10 min.
6. The composition of claim 1 comprising
a) from 15 wt % to 50 wt % ethylene/α-olefin multi-block copolymer;
b) from 25 wt % to 60 wt % tackifier; and
c) from 15 wt % to 45 wt % wax selected from the group consisting of paraffin wax, microcrystalline wax, and combinations thereof; and
the composition has a mandrel flex value (0° C.) from 80% to 100% and a mandrel flex value (−18° C.) from 80% to 100% as measured in accordance with ASTM D 522.
7. The composition of claim 6 wherein the composition has a viscosity from 500 centipoise to 10000 centipoise.
8. The composition of claim 6 wherein the composition has a softening point from 75° C. to 95° C.
9. The composition of claim 6 wherein the composition has a heat stress temperature from 30° C. to 70° C.
10. The composition of claim 1 wherein the wax is a paraffin wax.
11. An article comprising at least one component comprising the composition of claim 1 .