专利号:US-4452968-A 优先权日:1981-11-30 标题 :Synthesis of polycarbonate from dialkyl carbonate and bisphenol diester 发明人:BOLON DONALD A; HALLGREN JOHN E 权利人:GEN ELECTRIC 摘要:Polycarbonates are formed by the interaction of a bisphenol diester, carbon monoxide and oxygen. The initial polycarbonate product is an oligomer which, upon heat treatment, polymerizes to a high molecular weight polycarbonate. The products produced according to the present invention are chainstopped prior to heat treatment, making them less thermally and oxidatively sensitive.
专利号:CA-1188846-A 优先权日:1981-11-30 标 题 :Synthesis of polycarbonates