	US 12,466,913 B2
	Method for the production of a thermoplastic polyoxazolidinone
Sohajl Movahhed, Cologne (DE); Stefan Westhues, Leverkusen (DE); Daniel Thiel, Leverkusen (DE); Kai Laemmerhold, Odenthal (DE); Aurel Wolf, Wülfrath (DE); and Christoph Guertler, Cologne (DE)
Assigned to Covestro Deutschland AG, Leverkusen (DE)
Appl. No. 18/017,115
Filed by Covestro Deutschland AG, Leverkusen (DE)
PCT Filed Aug. 17, 2021, PCT No. PCT/EP2021/072794 § 371(c)(1), (2) Date Jan. 20, 2023, PCT Pub. No. WO2022/043125, PCT Pub. Date Mar. 3, 2022.
Claims priority of application No. 20192497 (EP), filed on Aug. 24, 2020; and application No. 21158362 (EP), filed on Feb. 22, 2021.
Prior Publication US 2023/0257512 A1, Aug. 17, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C08G 59/40 (2006.01); C08G 18/00 (2006.01); C08G 18/16 (2006.01); C08G 18/76 (2006.01)

CPC C08G 59/4028 (2013.01) [C08G 18/003 (2013.01); C08G 18/168 (2013.01); C08G 18/7671 (2013.01)]

20 Claims

1. A process for producing thermoplastic polyoxazolidinones comprising copolymerizing a diisocyanate compound (A) with a bisepoxide compound (B) in the presence of a catalyst (C), a compound (D), and a compound (F) optionally in a solvent (E);

wherein the catalyst (C) is represented by the formula (I)

[A]⁺_n[Y]ⁿ⁻ (I)

wherein n is an integer having a value of 1, 2, or 3;

wherein [A]⁺ is a quaternary ammonium, quaternary phosphonium and/or quaternary stibonium;

wherein [Y]ⁿ⁻ is a monovalent, divalent or trivalent anion;

wherein the compound (D) comprises at least one of a monofunctional isocyanate, a monofunctional epoxide, a cyclic carbonate, a monofunctional alcohol, a monofunctional amine or a combination thereof;

wherein the compound (F) comprises at least one of a monofunctional isocyanate, a monofunctional epoxide, a cyclic carbonate, a monofunctional alcohol, a monofunctional amine or a combination thereof;

wherein the process is conducted in the absence of a solvent (G), wherein the solvent (G) has a boiling point higher than 200° C. at 1 bar (absolute),

and wherein the process comprising:

(α) reacting of the diisocyanate compound (A) with the bisepoxide compound (B) in the presence of the catalyst (C) and the compound (D) that is optionally in the solvent (E) to form an intermediate compound; and

(β) reacting the compound (F) with the intermediate compound formed in step (a).