Vinylidene chloride interpolymer and poly(butylene succinate) blend
View Patent ↗Barrier films made from a composition comprising vinylidene chloride (VDC) interpolymer and poly(butylene succinate) (PBS) exhibit improved tear resistance in both the machine and cross directions without a significant deterioration in oxygen transmission rate as compared to barrier films made under like conditions and from a composition alike in all respects except that the PBS is replaced with additional VDC interpolymer.
1. A blend consisting essentially of, based on the weight of the blend:
A. 80 to less than 100 wt % vinylidene chloride (VDC) interpolymer, wherein the VDC interpolymer comprises mer units derived from one or more of an alkyl acrylate, alkyl methacrylate or acrylonitrile monomer; and
B. Greater than zero to 15 wt % poly(butylene succinate) (PBS), wherein the PBS has a Mw of 40,000 to 1,000,000 Daltons.
2. The blend of claim 1 comprising 2 to 15 wt % PBS.
3. The blend of claim 1 in which the VDC interpolymer has a Mw of 50,000 to 250,000 Daltons.
4. The blend of claim 1 in which the VDC intcrpolymer comprises 70 mole percent or more mer units derived from vinylidene chloride monomer.
5. The blend of claim 1 in which the VDC interpolymer consists of mer units derived from vinylidene chloride and methyl acrylate monomers.
6. The blend of claim 1 in which the VDC interpolymer comprises mer units derived from one or more of an alkyl acrylate and alkyl methacrylate selected from the group consisting of methyl acrylates, ethyl acrylates, and methyl methacrylates.
7. A composition comprising, based on the weight of the composition:
A. 80 to less than 100 wt % VDC interpolymer, wherein the VDC interpolymer comprises mer units derived from one or more of an alkyl acrylate, alkyl methacrylate or acrylonitrile monomer;
B. Greater than zero to less than 20 wt % PBS, wherein the PBS has a Mw of 40,000 to 1,000,000 Daltons; and
C. One or more additives.
8. The composition of claim 7 comprising 2 to 15 wt % PBS.
9. The composition of claim 7 in which the VDC interpolymer has a Mw of 40,000 to 250,000 Daltons.
10. The composition of claim 7 in which the VDC interpolymer comprises 70 mole percent or more mer units derived from vinylidene chloride monomer.
11. The composition of claim 7 in which the VDC interpolymer consists of mer units derived from vinylidene chloride and methyl acrylate monomers.
12. The composition of claim 7 in which the VDC interpolymer comprises mer units derived from one or more of an alkyl acrylate and alkyl methacrylate selected from the group consisting of methyl acrylates, ethyl acrylates, and methyl methacrylates.
13. The composition of claim 7 in which the additive is one or more of an antioxidant, heat stabilizer, plasticizer, light stabilizer, pigment, processing aid, lubricant, acid scavenger, filler and wax.
14. A film made from the composition of claim 7 .