Aliphatic polycarbonate/polyester polymer resin composition having superior low-temperature resistance

1. A film including a poly(alkylene carbonate) resin composition having superior low-temperature resistance consisting essentially of:

a) a poly(alkylene carbonate) resin of 60 to 95 weight % prepared by copolymerization of carbon dioxide and at least one epoxide compound selected from the group consisting of (C2-C20)alkyleneoxide unsubstituted or substituted with halogen, (C1-C20)alkyloxy, (C6-C20)aryloxy, or (C6-C20)ar(C1-C20)alkyloxy; (C4-C20)cycloalkyleneoxide unsubstituted or substituted with halogen, (C1-C20)alkyloxy, (C6-C20)aryloxy or (C6-C20)ar(C1-C20)alkyloxy; and (C8-C20)styreneoxide unsubstituted or substituted with halogen, (C1-C20)alkyloxy, (C6-C20)aryloxy, (C6-C20)ar(C1-C20)alkyloxy, or (C1-C20)alkyl; and

b) any one or two or more partially aromatic polyesters of 5 to 40 weight % selected from poly(butylene adipate-co-terephthalate) (PBAT) and poly(butylene succinate-co-terephthalate) (PBST), and

satisfying the following equations 1 to 3:

500≦ E TD ≦800 at a film thickness of 50 μm  [Equation 1]

50≦ E MD ≦400 at a film thickness of 50 μm  [Equation 2]

−30≦ T C ≦−10 at a film thickness of 50 μm  [Equation 3]

wherein in Equation 1, E TD represents an elongation value (%) in a vertical direction; in Equation 2, E MD represents an elongation value (%) in a horizontal direction; and in Equation 3, T C represents a low-temperature resistant temperature (° C.).

2. The film including a poly(alkylene carbonate) resin composition of claim 1 , wherein the poly(alkylene carbonate) resin is represented by Chemical Formula 1 below:

wherein in Chemical Formula 1, w is an integer of 2 to 10, x is an integer of 5 to 100, y is an integer of 1 to 100, n is an integer of 1 to 3, and R is hydrogen, (C1-C4)alkyl, or —CH 2 —O—R′ (R′ is (C1-C8)alkyl).

3. The film including a poly(alkylene carbonate) resin composition of claim 1 , wherein the poly(alkylene carbonate) resin has a weight average molecular weight of 50,000 to 1,000,000.

4. The film including a poly(alkylene carbonate) resin composition of claim 1 , wherein the poly(alkylene carbonate) resin has a glass transition temperature (Tg) of 10 to 40° C., and a Melt Index (MI) (150°) C/5 kg) of 0.1 to 20.

5. The film including a poly(alkylene carbonate) resin composition of claim 1 , wherein the poly(alkylene carbonate) resin is polypropylene carbonate) prepared by copolymerization of polypropylene oxide and carbon dioxide.

6. The film including a poly(alkylene carbonate) resin composition of claim 1 , further comprising: any one or two or more additives selected from a group consisting of an inorganic filler, a softener, an antioxidant, an age resister, a stabilizer, a tackifier resin, a leveling agent, an anti-blocking agent, a curing accelerator, an ionic liquid, a defoamer, a coloring agent, a sunblock agent, a fluorescent whitening agent, a dispersant, an UV-absorber, an alkali metal salt, and a lubricant.

7. The film including a poly(alkylene carbonate) resin composition of claim 1 , satisfying the following equations 4 and 5:

60≦oxygen≦65 at a film thickness of 50 μm  [Equation 4]

148≦H 2 O≦177 at a film thickness of 50 μm  [Equation 5]

wherein in Equation 4, oxygen is an O 2 permeability (cc/(m 2 ·day)); and in Equation 5, H 2 O is an H 2 O permeability (cc/(m 2 ·day)).