NOVA SUBSIDIARY RAISES U.S. POLYETHYLENE PRICES Novacor Inc, a unit of <Nova, an Alberta Corp>, said it would raise prices for U.S. customers by five cts a pound on linear low-density and low-density polyethylene, effective April 1. The company did not immediately disclose the actual new prices. A Novacor official later said in reply to an inquiry that the new prices, effective April 1, would range from 31 U.S. cts a pound to about 38 cts. The official said the increase reflected improved market conditions, although he noted the new prices would still be lower than those of three years ago.