	US 12,077,628 B2
	Transparent hard thermoplastic polyurethanes
Sebastian Richter, Shanghai (CN); Zeljko Tomovic, Lemfoerde (DE); and Sirus Zarbakhsh, Ludwigshafen (DE)
Assigned to BASF SE, Ludwigshafen am Rhein (DE)
Appl. No. 17/252,929
Filed by BASF SE, Ludwigshafen am Rhein (DE)
PCT Filed Jun. 18, 2019, PCT No. PCT/EP2019/066018 § 371(c)(1), (2) Date Dec. 16, 2020, PCT Pub. No. WO2019/243334, PCT Pub. Date Dec. 26, 2019.
Claims priority of application No. 18178490 (EP), filed on Jun. 19, 2018.
Prior Publication US 2021/0163660 A1, Jun. 3, 2021
Int. Cl. C08G 18/42 (2006.01); C08G 18/32 (2006.01); C08G 18/66 (2006.01); C08G 18/76 (2006.01); C08J 5/18 (2006.01)

CPC C08G 18/3206 (2013.01) [C08G 18/4213 (2013.01); C08G 18/4216 (2013.01); C08G 18/664 (2013.01); C08G 18/7671 (2013.01); C08J 5/18 (2013.01)]

14 Claims

1. A thermoplastic polyurethane, obtained by reacting at least the following components (i) to (iii):

(i) a polyisocyanate composition,

(ii) a chain extender, and

(iii) a polyol composition,

wherein the polyol composition comprises a polyol (P1) having a molecular weight Mw in a range of from 500 to 2500 g/mol and having an aromatic polyester block (B1),

wherein the polyol (P1) comprises 20% to 70% by weight of the aromatic polyester block (B1), based on an overall weight of the polyol (P1), and

wherein the molecular weight Mw is calculated according to the formula:

Mw=1000 mg/g·[(z·56.106 g/mol)/(OHN [mg/g])],

where z=2,

wherein a hard segment content in the thermoplastic polyurethane is in a range of from 75% to 99%, and

wherein the thermoplastic polyurethane is transparent.