Biodegradable polyester mixture

1. A biodegradable polyester mixture comprising:

i) 45 to 95 wt %, based on the total weight of components i and ii, of a polyester I constructed from:

a-1) 40 to 70 mol %, based on components a and b, of an aliphatic C 9 -C 18 dicarboxylic acid or of a C 9 -C 18 dicarboxylic acid derivative;

b-1) 30 to 60 mol %, based on components a and b, of terephthalic acid or of a terephthalic acid derivative;

c-1) 98 to 100 mol %, based on components a and b, of a C 3 -C 6 diol;

d-1) 0 to 2 wt %, based on the total weight of components a to e, of an at least trihydric alcohol; and

e-1) 0 to 2 wt %, based on the total weight of components a to e, of a chain extender;

ii) 5 to 55 wt %, based on the total weight of components i and ii, of a polyester II constructed from:

a-2) 40 to 70 mol %, based on components a and b, of an aliphatic C 4 -C 6 dicarboxylic acid or of a C 4 -C 6 dicarboxylic acid derivative;

b-2) 30 to 60 mol %, based on components a and b, of terephthalic acid or of a terephthalic acid derivative;

c-2) 98 to 100 mol %, based on components a and b, of a C 3 -C 6 diol;

d-2) 0 to 2 wt %, based on the total weight of components through e, of an at least trihydric alcohol; and

e-2) 0 to 2 wt %, based on the total weight of components a to e, of a chain extender;

iii) 10 to 25 wt %, based on the total weight of the polymer mixture i to iv, of calcium carbonate; and

iv) 3 to 15 wt %, based on the total weight of the polymer mixture i to iv, of talc.

2. The biodegradable polyester mixture according to claim 1 comprising from 0.1 to 1.5 wt %, based on the total weight of the polymer mixture, of one or more than one stabilizer, nucleating agent, glide and release agent, surfactant, wax, antistat, antifoggant, dye, pigment, UV absorber, UV stabilizer, or other plastics additive.

3. A shopping bag, compost bag, or inliner for a biowaste bin comprising the polyester mixture according to claim 1 .

4. An agriproduct selected from the group consisting of mulch films, covering films, bead foam for soil aeration, silo films, slit film tapes, wovens, nonwovens, clips, textiles, threads, fishing nets, secondary packaging, heavy-duty bags, and flowerpots, said agriproduct comprising the polyester mixture according to claim 1 .

5. The biodegradable polyester mixture according to claim 1 wherein said diacid component a-1 of polyester I is sebacic acid or a sebacic acid derivative.

6. The biodegradable polyester mixture according to claim 5 wherein said diacid component a-2 of polyester II is adipic acid or an adipic acid derivative.

7. The biodegradable polyester mixture according to claim 1 wherein said diacid component a-2 of polyester II is adipic acid or an adipic acid derivative.

8. The biodegradable polyester mixture according to claim 7 further comprising an added 0 to 50 wt %, based on the total weight of the polymer mixture, of one or more polymers v) selected from the group consisting of polylactic acid, polycaprolactone, polyhydroxyalkanoate, starch, and polyester prepared from an aliphatic dicarboxylic acid and an aliphatic dihydroxy compound.

9. The biodegradable polyester mixture according to claim 8 further comprising from 5 to 45 wt %, based on the total weight of the polymer mixture, of polycaprolactone (PCL) or of an aliphatic polyester selected from the group consisting of polybutylene succinate (PBS), polybutylene adipate (PBA), polybutylene succinate adipate (PBSA), polybutylene succinate sebacate (PBSSe), polybutylene sebacate (PBSe), polyethylene succinate (PES) and polycaprolactone (PCL).

10. The biodegradable polyester mixture according to claim 9 comprising from 0.1 to 1.5 wt %, based on the total weight of the polymer mixture, of one or more than one stabilizer, nucleating agent, glide and release agent, surfactant, wax, antistat, antifoggant, dye, pigment, UV absorber, UV stabilizer, or other plastics additive.

11. The biodegradable polyester mixture according to claim 1 further comprising an added 0 to 50 wt %, based on the total weight of the polymer mixture, of one or more polymers v) selected from the group consisting of polylactic acid, polycaprolactone, polyhydroxyalkanoate, starch, and polyester prepared from an aliphatic dicarboxylic acid and an aliphatic dihydroxy compound.

12. The biodegradable polyester mixture according to claim 11 further comprising from 5 to 45 wt %, based on the total weight of the polymer mixture, of polycaprolactone (PCL) or of an aliphatic polyester selected from the group consisting of polybutylene succinate (PBS), polybutylene adipate (PBA), polybutylene succinate adipate (PBSA), polybutylene succinate sebacate (PBSSe), polybutylene sebacate (PBSe), polyethylene succinate (PES) and polycaprolactone (PCL).

13. The biodegradable polyester mixture according to claim 12 comprising from 0.1 to 1.5 wt %, based on the total weight of the polymer mixture, of one or more than one stabilizer, nucleating agent, glide and release agent, surfactant, wax, antistat, antifoggant, dye, pigment, UV absorber, UV stabilizer, or other plastics additive.

14. The biodegradable polyester mixture according to claim 11 further comprising from 5 to 45 wt %, based on the total weight of the polymer mixture, of starch and/or of a polyhydroxyalkanoate.

15. The biodegradable polyester mixture according to claim 11 further comprising from 5 to 25 wt %, based on the total weight of the polymer mixture, of polylactic acid.