Patent ID: 8808843

Claim:
A transparent multilayer sheet having electrostatic dissipative properties, the sheet comprising: a surface layer comprising a conductive thermoplastic polyurethane or polyurea resin wherein the polyurethane or polyurea resin comprises a polymerization reaction product of (a) polyethylene glycol; (b) an aromatic or aliphatic diisocyanate compound; and (c) a chain extender C2 to C10 containing a primary hydroxyl group or an amine group; and a back layer attached to the surface layer where said back layer consists of a transparent non-conductive polymer layer wherein said layer comprises a transparent non-conductive polymer resin; wherein the transparent multilayer sheet further comprises an electrostatic dissipative property enhancer in the form of an inorganic or organic salt in an amount of 0.1 to 20 parts by weight, based on 100 parts by weight of a total use amount of the polyethylene glycol, the diisocyanate compound, and the chain extender; and wherein the electrostatic dissipative property enhancer in the form of an organic salt comprises a nitrogenous cation and an anion coordinated thereto, the nitrogenous cation is selected from the group consisting of pyridinium, pyridazinium, pyrimidinium, pyrazinium, imidazolium, pyrazolium, thiazolium, oxazolium, triazolium, and mixtures thereof, and the anion is selected from the group consisting of Cl − , Br − , F − , HSO 4 − , H 2 PO 4 − , NO 3 − , ClO 4 − , BF 4 − , PF 6 − , SbF 6 − , AsF 6 − , alkanesulfonates, arylsulfonates, and alkarylsulfonates, perfluoroalkanesulfonates, cyanoperfluoroalkanesulfonylamides, bis(cyano)fluoroalkanesulfonylmethides, bid(perfluoroalkanesulfonyl)imides, bis(perfluoroalkanesulfonyl)methides, tris(perfluoroalkanesulfonyl)methides, and mixtures thereof.