US 11,787,936 B2
Polyurethane polymer having a hardness of less than or equal to 60 shore A and good abrasion resistance
Yi Shen, Dormagen (DE); Georg Fuchte, Leverkusen (DE); Slaven Gojsic, Zagreb (HR); Franz-Heinrich Hermanns, Grevenbroich (DE); and Peter Reichert, Dormagen (DE)
Assigned to Covestro Intellectual Property GmbH & Co. KG, Leverkusen (DE)
Filed by Covestro Intellectual Property GmbH & Co. KG, Leverkusen (DE)
Filed on Oct. 20, 2020, as Appl. No. 17/74,870.
Claims priority of application No. 19204777 (EP), filed on Oct. 23, 2019.
Prior Publication US 2021/0122919 A1, Apr. 29, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. C08G 18/16 (2006.01); C08L 75/06 (2006.01); C08G 18/12 (2006.01); C08G 18/32 (2006.01); C08G 18/42 (2006.01); C08G 18/48 (2006.01); C08G 18/73 (2006.01); C08G 18/76 (2006.01); C08K 5/00 (2006.01); C08L 75/08 (2006.01)
CPC C08L 75/06 (2013.01) [C08G 18/12 (2013.01); C08G 18/16 (2013.01); C08G 18/3206 (2013.01); C08G 18/3215 (2013.01); C08G 18/4261 (2013.01); C08G 18/4808 (2013.01); C08G 18/73 (2013.01); C08G 18/7657 (2013.01); C08K 5/00 (2013.01); C08L 75/08 (2013.01); C08G 2410/00 (2013.01); C08K 2201/019 (2013.01); C08L 2203/30 (2013.01)] 18 Claims
 
1. A roller or a wheel, comprising: a thermoplastically processible polyurethane polymer having a hardness of ≤60 Shore A, obtained by reacting the following components
(A) one or more essentially linear polyether polyols and/or polyester polyols, where a total amount of component (A) has an average molecular weight Mn in a range from 500 g/mol to 5000 g/mol, Mn having been calculated from an OH number determined according to DIN53240,
(B) one or more diisocyanates comprising 2-methyl-1,5-diisocyanatopentane, 1,4-diisocyanatobutane (BDI), 1,5-diisocyanatopentane, 1,6-diisocyanatohexane, 2,2,4-trimethyl-1,6-diisocyanatohexane, 2,4,4-trimethyl-1,6-diisocyanatohexane, or diphenylmethane diisocyanate isomer mixtures having a diphenylmethane 4,4′-diisocyanate content of >96% by weight,
(C) one or more linear diols having a molecular weight of 62 g/mol to 500 g/mol,
(D) optionally in the presence of one or more catalysts,
(E) optionally in the presence of one or more additives, auxiliaries additions, or a combination thereof, and
(F) optionally in the presence of one or more monofunctional chain terminators,
wherein the reaction is performed in a solvent-free fashion and comprises:
1) providing and reacting a mixture made up of the total amount of component (A), a portion of component (B) and optionally a portion or a total amount of component (D), component (E), component (F), or a combination thereof to give an NCO-functional prepolymer, wherein there is a molar ratio of component (B) to component (A) in a range from 1.1:1.0 to 5.0:1.0,
2) reacting the NCO-functional prepolymer with a total amount of component (C) to obtain an OH-functional prepolymer, optionally in the presence of a further portion of component (D), component (E), component (F), or a combination thereof,
3) reacting the OH-functional prepolymer with a remaining amount of component (B) and any remaining amount of component (D), component (E), component (F), or a combination thereof to obtain a thermoplastically processible polyurethane, wherein during all process steps there is a molar ratio of component (B) to a sum total of component (A) and component (C) in a range from 0.9:1.0 to 1.2:1.0.