US 12,168,712 B2
Continuous production of a PPG-based TPU
Frank Schaefer, Lemfoerde (DE); Michael Freese, Lemfoerde (DE); Elmar Poeselt, Lemfoerde (DE); Etsuhiro Yamamoto, Yokkaichi (JP); Yasuyuki Suzuki, Yokkaichi (JP); Dai Watanabe, Yokkaichi (JP); and Patrick Drawe, Lemfoerde (DE)
Assigned to BASF SE, Ludwigshafen am Rhein (DE)
Appl. No. 17/309,421
Filed by BASF SE, Ludwigshafen am Rhein (DE)
PCT Filed Nov. 29, 2019, PCT No. PCT/EP2019/083115
§ 371(c)(1), (2) Date May 26, 2021,
PCT Pub. No. WO2020/109566, PCT Pub. Date Jun. 4, 2020.
Claims priority of application No. 18209089 (EP), filed on Nov. 29, 2018.
Prior Publication US 2022/0025097 A1, Jan. 27, 2022
Int. Cl. C08G 18/10 (2006.01); C08G 18/32 (2006.01); C08G 18/48 (2006.01)
CPC C08G 18/10 (2013.01) [C08G 18/3206 (2013.01); C08G 18/4825 (2013.01); C08G 18/4845 (2013.01)] 20 Claims
 
1. A thermoplastic polyurethane having a glass transition temperature of a soft phase of not more than −25° C. measured using DMA and a heating rate of 2K/min at 1 Hz under torsion based on DIN EN ISO 6721: 2016; maximum G″ obtained by a process at least comprising steps (i) and (ii):
(i) reacting a first polyol composition comprising at least one polyol based on polypropylene glycol, wherein a proportion of secondary terminal OH groups based on a total number of terminal OH groups of the polypropylene glycol is in a range of >90% and the polypropylene glycol has a number-average molecular weight Mn in a range from 650 g/mol to 4000 g/mol, with a first polyisocyanate to obtain a second polyol composition comprising a prepolymer,
(ii) reacting the second polyol composition comprising the prepolymer with a polyisocyanate composition comprising at least one second polyisocyanate and at least one chain extender having a molecular weight <500 g/mol, wherein the reaction according to step (i) is carried out continuously.