Patent ID: 8545728

Claim:
A method for preparing an electrostatic dissipative polyurethane, comprising the steps of: reacting polyethyleneglycol and diisocyanate in the presence of a chain extender selected from the group consisting of diethyleneglycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,4-cyclohexanedimethanol, hydroquinone bis(di-hydroxyethyl)ether, 1,6-hexanediol and the mixtures thereof excluding ethylene carbonate and propylene carbonate, wherein the amount of the chain extender ranges from 0.1 moles to 15.0 moles for 1 mole of polyethyleneglycol; and adding the reactive solvent ethyleneglycol to the polymerization reaction, wherein lithium salt is dissolved in the ethyleneglycol, the amount of the ethyleneglycol is from 0.1 to 20 weight parts based on 100 weight parts of the produced electrostatic dissipative polyurethane, and the amount of lithium salt is from 0.1 to 5 weight parts based on 100 weight parts of the produced electrostatic dissipative polyurethane, wherein the temperature of the polymerization reaction occurs between 180° C. and 250° C., wherein the lithium salt is lithium(bis)perfluoroethanesulfonimide (LiN(SO 2 C 2 F 5 ) 2 ).