	US 11,981,783 B2
	Colorless clear flexible polyurethane with high dielectric constant and self-repairing method thereof
Aijuan Gu, Suzhou (CN); Guozheng Liang, Suzhou (CN); and Li Yuan, Suzhou (CN)
Assigned to SOOCHOW UNIVERSITY, Suzhou (CN)
Filed by SOOCHOW UNIVERSITY, Suzhou (CN)
Filed on Aug. 10, 2021, as Appl. No. 17/398,285.
Application 17/398,285 is a continuation of application No. PCT/CN2019/075130, filed on Feb. 14, 2019.
Prior Publication US 2021/0363315 A1, Nov. 25, 2021
Int. Cl. C08J 5/18 (2006.01); C08G 18/12 (2006.01); C08G 18/38 (2006.01); C08G 18/44 (2006.01); C08G 18/66 (2006.01); C08G 18/75 (2006.01)

CPC C08J 5/18 (2013.01) [C08G 18/12 (2013.01); C08G 18/3863 (2013.01); C08G 18/44 (2013.01); C08G 18/66 (2013.01); C08G 18/755 (2013.01); C08J 2375/04 (2013.01)]

6 Claims

1. A method for preparing a transparent flexible polyurethane film, comprising the following steps:

(1) mixing a hydroxyl-terminated polyalkylene carbonate diol, a diisocyanate compound, 2,2′-dithiodiethanol, dibutyltin dilaurate and a chloroalkane solvent, and then reacting at 40 to 60° C. for 0.5 to 3 h to obtain an isocyanate-terminated oligomer solution; and

(2) adding a polyol cross-linking agent, a bistrifluoromethanesulfonimide lithium salt and a 1-ethyl-3-methylimidazole bistrifluoromethanesulfonimide salt to the isocyanate-terminated oligomer solution, reacting at 40 to 60° C. for 0.5 to 1.5 h, removing the chloroalkane solvent to obtain the transparent flexible polyurethane film.