Polymeric composition with sealant layer with same
Disclosed herein is a polymeric composition. The polymeric composition includes: (A) a propylene/a-olefin interpolymer; (B) an ethylene-based polymer; (C) a block composite comprising: i) a propylene-based crystalline polymer; ii) an ethylene/a-olefin polymer; and iii) a block copolymer comprising a propylene-based crystalline block and an ethylene/a-olefin block. The polymeric composition provides improved heat seals when formed into film, film layer, or flexible containers such as a retort pouch.
1. A film comprising:
a first layer comprising a polymeric composition comprising:
(A) a propylene/a-olefin interpolymer;
(B) an ethylene-based polymer;
(C) a block composite comprising:
i) a propylene-based crystalline polymer;
ii) an ethylene/a-olefin polymer; and
iii) a block copolymer comprising a propylene-based crystalline block and an ethylene/a-olefin block; and
a second layer comprising an olefin-based polymer.
2. The film of claim 1 wherein Component (A) comprises a propylene/ethylene copolymer having a density from 0.85 g/cc to 0.90 g/cc.
3. The film of claim 1 wherein Component (A) has a melt flow rate from 0.5 g/10 min to 10 g/min.
4. The film of claim 1 wherein Component (B) comprises an ethylene-based polymer having a density greater than 0.941 g/cc.
5. The film of claim 1 wherein Component (B) has a melt index from 1.0 g/10 min to 20.0 g/10 min.
6. The film of claim 1 wherein the block copolymer (C)(iii) comprises a diblock with the formula (1) below:
(EP)-(iPP) (1)
wherein EP represents a segment of polymerized ethylene and propylene monomeric units, and iPP represents a segment of isotactic propylene homopolymer.
7. The film of claim 1 , wherein block composite (C) comprises greater than 15 wt % of C(iii), based on the total weight of block composite (C).
8. The film of claim 1 wherein block composite (C) has a density from 0.88 g/cc to 0.90 g/cc and a melt index from 1 g/10 min to 50 g/10 min.
9. The film of claim 1 wherein the polymeric composition further comprises an olefin-based polymer.
10. The film of claim 1 wherein the second layer comprises an olefin-based polymer and optionally a functionalized olefin-based polymer.
11. A retort pouch comprising:
the film of claim 1 ; and
an optional third layer.
12. The retort pouch of claim 11 wherein the first layer is a sealant layer and the second layer comprises from 70 wt % to 99 wt % of an olefin-based polymer and from 30 wt % to 1 wt % of a functionalized olefin-based polymer.
13. The retort pouch of claim 11 wherein the third layer comprises a material selected from the group consisting of nylon, polyethylene terephthalate (PET), polypropylene, and combinations thereof.