Blends of polyesters and polysaccharides

A polyester composition comprising:

• A) from about 10 to about 75 weight percent of at least one polyester selected from the group consisting of poly(trimethylene terephthalate), polyethylene terephthalate, polybutylene terephthalate, and copolymers thereof;
• and
• B) from about 25 to about 90 weight percent of at least one poly alpha-1,3-glucan ester having a degree of substitution of from about 0.3 to 3 moles of at least two acyl groups per repeat unit of poly alpha-1,3-glucan;
• wherein said at least one poly alpha-1,3-glucan ester comprises from 0.05 to 0.2 moles of at least one acyl group selected from enanthyl, caprylyl, pelargonyl, capryl, undecanoyl, lauroyl, tridecanoyl, myristyl, pentadecanoyl, palmitoyl, heptadecanoyl, stearyl, nonadecanoyl, arachidyl, uneicosanoyl, behenyl, trieicosanoyl, lignoceryl, pentaleicosanoyl, cerotyl, and from 2.7 to 2.3 moles of acetyl groups;
• and
• wherein said polyester composition exhibits an impact strength when measured according to ASTM 256-10 which is at least 10 percent greater than polyester A.

A polyester composition comprising:

• C) from about 10 to about 85 weight percent of poly(trimethylene terephthalate);
• and
• D) from about 15 to about 90 weight percent of at least one poly alpha-1,3-glucan ester having a degree of substitution of from about 2.3 to 2.9 moles of at least two acyl groups per repeat unit of poly alpha-1,3-glucan;
• wherein said at least one poly alpha-1,3-glucan ester comprises from 0.05 to 0.2 moles of at least one acyl group selected from enanthyl, caprylyl, pelargonyl, capryl, undecanoyl, lauroyl, tridecanoyl, myristyl, pentadecanoyl, palmitoyl, heptadecanoyl, stearyl, nonadecanoyl, arachidyl, uneicosanoyl, behenyl, trieicosanoyl, lignoceryl, pentaleicosanoyl, cerotyl, and from greater than 2.3 to 2.7 moles of acetyl groups;
• and
• wherein said polyester composition exhibits a heat deflection temperature when measured according to ASTM D648-16 method B which is at least equal to or greater than polyester A.