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1. (WO2018001943) POLYMER COMPOSITION COMPRISING AT LEAST ONE VINYL AROMATIC DIENE BLOCK COPOLYMER AND SPECIFIC AMOUNTS OF OIL
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Claims

1 . A polymer composition comprising

90 to 98 % by weight, based on the total polymer composition;

at least one block copolymer P, having one of the following formulas (I) to (III):

(A-B/A)n-A (I),


Y-[(B/A-A)n]m+i (III),

wherein the abbreviations and indices have the following meaning:

A is a vinyl aromatic block forming a hard phase, which is composed of at least one vinyl aromatic monomer MA,

B/A is a diene block forming a soft phase, which is composed of at least one conjugated diene monomer MB and at least one vinyl aromatic monomer MA,

X is the radical of an m+1 -functional initiator,

Y is the radical of an m+1 -functional coupling agent, n is a natural number from 1 to 10, and

m is a natural number from 1 to 10;

2 to 10 % by weight, based on the total polymer composition,

at least one oil component C; and

0 to 5 % by weight, one or more further components E; wherein

the at least one block copolymer P comprises 40 to 75 % by weight, based on the block copolymer P, of the at least one vinyl aromatic monomer MA and 25 to 60 % by weight, based on the block copolymer P, of the at least one conjugated diene monomer MB;

the glass transition temperature/s Tg of the vinyl aromatic block/s A is/are above 25 °C and the glass transition temperature/s Tg of the diene block/s B/A is/are below 25 °C,

the proportion of the vinyl aromatic block/s forming the hard phase is from 5 to

40 % by volume, based on the total volume of block copolymer P;

the relative amount of 1 ,2 linkages in the diene block B/A, based on the sum of 1 ,2-and 1 ,4-cis/trans-linkages, is less than or equal to 15 %;

and the weight average molecular weight Mw of the block copolymer P is equal to or greater than 100,000 g/mol.

2. The polymer composition according to claim 1 , wherein the vinyl aromatic monomer MA is at least one monomer, selected from the group consisting of sty- rene, omethylstyrene, vinyltoluene and 1 ,1 -diphenylethylene, and the conjugated diene monomer MB is at least one monomer selected from the group con- sisting of butadiene and isoprene.

3. The polymer composition according to any of claims 1 or 2, wherein the vinyl aromatic monomer MA is at least one monomer, selected from the group consisting of styrene and a -methylstyrene, and the conjugated diene monomer MB is butadiene.

4. The polymer composition according to any of claims 1 to 3, wherein the molecular weight of the vinyl aromatic block/s A is/are in the range of 5,000 to

100,000 g/mol; and the molecular weight of the diene block/s B/A is/are in the range of 20,000 to 250,000 g/mol

5. The polymer composition according to any of claims 1 to 4, wherein the glass transition temperature Tg of the vinyl aromatic block/s A is/are above 50 °C and the glass transition temperature Tg of the diene block/s B/A is/are below 5 °C.

6. The polymer composition according to any of claims 1 to 5, wherein the relative amount of 1 ,2 linkages in the diene block B/A of the block copolymer P, based on the sum of 1 ,2-and 1 ,4-cis/trans-linkages, is less than or equal to 12 %;

7. The polymer composition according to any of claims 1 to 6, wherein the molecular weight of the block copolymer P is in the range of 100,000 to 400,000 g/mol.

8. The polymer composition according to any of claims 1 to 7, wherein the oil component is at least on oil selected from mineral oils, vegetable oils and silicon oils.

9. The polymer composition according to any of claims 1 to 8, wherein the oil component C is at least one paraffin oil having a viscosity in the range of 20 to 300 mPas, measured at a temperature in the range of 20 to 25 °C.

10. The polymer composition according to any of claims 1 to 9, wherein the block copolymer P is obtained by a process which comprises the step of forming the block copolymer by sequential anionic polymerization, where at least the polymerization step of the at least one block B/A takes place in the presence of a potassium salt as randomizer.

1 1 . The polymer composition according to any of claims 1 to 10, wherein the composition comprises 94.9 to 97.49 % by weight, based on the total polymer composition; of the at least one block copolymer P, and 2.5 to 5 % by weight, based on the total polymer composition, of the at least one oil component C, and 0.01 to 5 % by weight, based on the total polymer composition, one or more further components E.

12. A moulded part made from the polymer composition according to any of claims 1 to 1 1 .

13. The moulded part according to claim 12 wherein the moulded part is selected from extruded sheets, extruded multilayer sheets, extruded tubings, multilumen tubings, drip chamber parts, food packagings, beakers, plates and labels.

14. Process for the production of the polymer composition according to any of claims 1 to 1 1 , wherein the at least one block copolymer P is mixed with the at least one oil component C, and optionally further components E.

15. The process according to claim 14, wherein mixing of the components is achieved by melt extrusion.