Patent ID: 11859042
Assignee: BASF SE
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A method for preparing a thermoplastic polyurethane, the method comprising:
(A) providing at least one polyol composition (P) comprising
a poly-ε-caprolactone polyol (P1), and
a polyol (P2) which is different from the poly-ε-caprolactone polyol (P1);

(B) reacting the at least one polyol composition (P) of (A) with at least one polyisocyanate (PI) and at least one low molecular weight diol (CE) optionally in the presence of at least one catalyst (CA) and/or at least one additive (AD) to obtain a thermoplastic polyurethane,
wherein the at least one polyol composition (P) has a number average molecular weight Mn in a range of ≥1,500 g/mol to ≤10,000 g/mol determined according to DIN 55672-1: 2016-03,
wherein the at least one low molecular weight diol (CE) has a molecular weight in a range of ≥50 g/mol to ≤350 g/mol, and
wherein in (A) the poly-ε-caprolactone polyol (P1) is obtained by reacting
ε-caprolactone (P11), and
a starter molecule (P12) having a number average molecular weight in a range of ≥80 g/mol to ≤1500 g/mol determined according to DIN 55672-1: 2016-03,

wherein the starter molecule (P12) is selected from the group consisting of neopentyl glycol, 1,4-butanediol, 1,6-hexanediol, polyethylene glycol, polypropylene glycol, α-hydro-ω-hydroxypoly(oxytetra-methylene) diol and α-hydro-ω-hydroxypoly(oxytri-methylene) diol, and
wherein in (B) a molar ratio between the at least one polyol composition (P) and the at least one polyisocyanate (PI) is in a range of ≥0.1:1 to ≤0.85:1.