Homogeneous extruded articles made from thermoplastically processable polyurethanes based on polyester diols formed from succinic acid and 1,3-propanediol

1. A method comprising preparing a thermoplastically processable polyurethane elastomer with hardness from 65 to 95 Shore A, determined in accordance with ISO 868, obtained from the components consisting of:

a) one or more substantially linear polyesterdiol with functionality from 1.8 to 2.2,

b) one or more organic diisocyanate,

c) one or more diol with a molar mass from 60 to 350 g/mol,

where the molar NCO:OH ratio is set at from 0.9:1 to 1.1:1,

and wherein the substantially linear polyesterdiol a) consists of succinic acid and of 1,3-propanediol and has an average molar mass of from 750 to 3500 g/mol.

2. An extruded item essentially consisting of a thermoplastically processable polyurethane elastomer with hardness from 65 to 95 Shore A, determined in accordance with ISO 868, obtained from the components consisting of:

a) one or more substantially linear polyesterdiol with functionality from 1.8 to 2.2,

b) one or more organic diisocyanate,

c) one or more diol with a molar mass from 60 to 350 g/mol,

where the molar NCO:OH ratio is set at from 0.9:1 to 1.1:1,

and wherein the substantially linear polyesterdiol a) consists of succinic acid and of 1,3-propanediol and has an average molar mass of from 750 to 3500 g/mol.

3. The extruded item as claimed in claim 2 , wherein at least one of components a) and c) has been produced entirely or to some extent biologically.

4. The extruded item as claimed in claim 2 , wherein the organic diisocyanate b) is selected from one or more isocyanates from the group consisting of diphenylmethane 4,4′-diisocyanate, isophorone diisocyanate, dicyclohexylmethane 4,4-diisocyanate, hexamethylene 1,6-diisocyanate, and naphthylene 1,5-diisocyanate.

5. The extruded item as claimed in claim 2 , wherein the diol c) is selected from the group consisting of 1,4-butanediol, 1,3-propanediol, ethylene 1,2-glycol, and 1,6-hexanediol.

6. The extruded item as claimed in claim 2 , wherein the succinic acid in the polyesterdiol is produced biologically by fermentation of carbohydrates.

7. The extruded item as claimed in claim 2 , wherein the 1,3-propanediol used in the polyesterdiol has been produced biologically via fermentation of carbohydrates.

8. The extruded item as claimed in claim 2 , wherein the diol comprises a biologically produced 1,3-propanediol.

9. A process for the production of an extruded item as claimed in claim 2 comprising extruding the thermoplastically processable polyurethane elastomers with hardness from 65 to 95 Shore A, determined in accordance with ISO 868, obtained from the components consisting of:

a) one or more substantially linear polyesterdiols with functionality from 1.8 to 2.2,

b) one or more organic diisocyanates,

c) one or more diols with molar masses from 60 to 350 g/mol,

where the molar NCO:OH ratio is set at from 0.9:1 to 1.1:1,

and wherein the substantially linear polyesterdiols a) consists of succinic acid and of 1,3-propanediol and have an average molar mass of from 750 to 3500 g/mol.