Cohesive fastener formulations with olefin block copolymers
The present disclosure is directed to a composition comprising a) an olefin block copolymer; b) a tackifier; c) an ethylene-based polymer with a density from 0.90 g/cc to 0.94 g/cc; and d) an oil. The composition finds advantageous application as a cohesive layer in a fastening device, for example, a fastening device for a hygiene absorbent product.
1. A composition comprising the following components:
a) from 30 wt % to 60 wt % of an ethylene/α-olefin multi-block copolymer;
b) from 30 wt % to 60 wt % of a tackifier;
c) from 5 wt % to 15 wt % of an ethylene-based polymer with a density from 0.90 g/cc to 0.94 g/cc;
d) from 5 wt % to 20 wt % of an oil; and
e) from 0 wt % to 10 wt % of at least one additive;
wherein each wt % is based on the weight of the composition.
2. The composition of claim 1 , wherein the ethylene-based polymer has a melt index from 0.5 g/10 min to 75 g/10 min.
3. The composition of claim 1 , wherein the tackifier is selected from the group consisting of the following; a non-hydrogenated aliphatic C 5 resin, a hydrogenated aliphatic C 5 resin, an aromatic modified C 5 resin, a terpene resin, a hydrogenated C 9 resin, and a combination thereof, and wherein the tackifier has a density from 0.92 g/cc to 1.06 g/cc, and a melt viscosity less than 1000 Pascal second (Pa·s) at 175° C.
4. The composition of claim 1 , wherein the ethylene-based polymer is an ethylene homopolymer that has a melt index from 30 g/10 min to 50 g/10 min.
5. The composition of claim 1 , comprising:
(a) from 30 wt % to 50 wt % of the olefin block copolymer;
(b) from 30 wt % to 50 wt % of the tackifier;
(c) from 5 wt % to 15 wt % of the ethylene-based polymer; and
(d) from 5 wt % to 15 wt % of the oil.
6. The composition of claim 1 , wherein the amount of olefin block copolymer present in the composition is greater than, or equal to, the amount of tackifier present in the composition.
7. The composition of claim 1 , wherein the composition has a density from 0.850 g/cc to 0.925 g/cc.
8. The composition of claim 1 , wherein the composition has a melt index from 10 g/10 min to 100 g/10 min (190° C. and 2.16 kg).
9. The composition of claim 1 , wherein the composition has a lap shear greater than 1 hour.
10. The composition of claim 1 , wherein the composition has a 180° peel force from “greater than 0 N/inch” to 4 N/inch.
11. The composition of claim 1 , wherein the composition has a T-peel force from 1 N/inch to 10 N/inch.
12. A film formed from the composition of claim 1 .
13. An article comprising at least one component formed from the composition of claim 1 .
14. The composition of claim 1 , wherein the ethylene-based polymer has a density from 0.92 to 0.94 g/cc.
15. The composition of claim 1 , wherein the ethylene-based polymer is an ethylene homopolymer.