Calendered polyester films or sheets having a haze value of less than five percent

A calendered film or sheet having a haze value of less than 5 percent and comprising a polyester resin composition comprising:

• (a) a polyester comprising (i) at least 90 mole percent of a diacid residue component of terephthalic acid and (ii) a diol residue component comprising about 10 to about 40 mole percent 1,4-cyclohexanedimethanol and about 60 to 90 mole percent ethylene glycol,
• (b) from about 0.1 to about 2 weight percent of an additive comprising (i) montanic acid or a salt of montanic acid and (ii) an ester wax of montanic acid containing montanyl alcohol, ethylene glycol, butylene glycol, glycerol and pentaerythritol, wherein the ratio of the montanic acid or salt of montanic acid to the ester wax is 1:1 or greater;
• wherein the weight percent of the additive is based on the total weight percent of the polyester resin composition.

A film or sheet made by a process comprising the step of calendering a polyester resin composition comprising

• (a) a polyester having a crystallization half-time from a molten state of at least 5 minutes,
• (b) an additive comprising a fatty acid or a salt of a fatty acid containing more than 18 carbon atoms and an ester wax comprising a fatty acid containing more than 18 carbon atoms with an alcohol containing from 2 to 28 carbon atoms, wherein the ratio of the fatty acid or salt of the fatty acid to the ester wax is 1:1 or greater;
• wherein the film or sheet has a haze value of less than 5 percent.