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Title: Polycarbonate resin having improved electrical tracking resistance
Claims: What is claimed is: 1. An electrical insulator having a minimum tracking resistance to leakage current of about 280 volts comprising an intimate blend of a high molecular weight thermoplastic polycarbonate based on an aromatic bis-hydroxy compound and 0.05% to 10% by weight of additives selected from the group consisting of oxides of vanadium, molybdenum, cerium, palladium, copper, silver, cobalt, nickel, and platinum. 2. An electrical insulator having a minimum tracking resistance to leakage current of about 300 volts comprising an intimate blend of a high molecular weight polycarbonate thermoplastic polycarbonate based on an aromatic bis-hydroxy compound and 0.05% to 10% by weight of additives selected from the group consisting of oxides of vanadium, molybdenum, palladium, copper, silver, cobalt, nickel, and platinum. 3. The insulator of claim 2 wherein the polycarbonate contains 0.1 to 3 percent by weight of additive based on the weight of polycarbonate. 4. The insulator of claim 2 wherein the additive is deposited on a carrier material which is blended with the polycarbonate. 5. The insulator of claim 2 wherein the polycarbonate has a molecular weight of between about 20,000 and 40,000. Other info: Inventors: Schiller, Paul (Krefeld, DT) Vernaleken, Hugo (Krefeld-Uerdingen, DT) Application Number: 455842 Filing Date: 1974-03-28 Publication_date: 1976-01-27 Assignee: Bayer Aktiengesellschaft (Leverkusen Bayerwerk, DT) Primary Class(es): 523/200 174/137B, 428/412, 524/403, 524/406, 524/408, 524/413, 524/431 Other Classes: US Patent Ref:
Other Refs: Other References: Polycarbonates -- Christopher & Fox. Reinhold Pub. Co., N.Y.C., 1962 pp. 151 and 152. | |