Polycarbonate and process for producing the same
AssigneeIdemitsu Petrochemical Co., Ltd.
InventorsShigeki Kuze, Ryozo Okumura, Noriyuki Kunishi
Life of this patent
Estimating the term…
Abstract
A polycarbonate having desirable color tone or transparency, as well as desirable heat resistance and water resistance, in which the amounts of residual metals in the polycarbonate are 10 ppm or less in total of Fe, Cr and Mo and 50 ppm or less in total of Ni and Cr. The polycarbonate is obtained by transesterification of (A) a dihydroxy compound and (B) a carbonic diester in a reactor made of a metallic material containing at least one metal selected from the group consisting of Fe, Cr, Mo, Ni and Cu, and controlling the water content in the reactor to 500 ppm or less.
Claims19
A polycarbonate which is obtained by transesterification of (A) a dihydroxy compound and (B) a carbonic diester in a reactor made of a metallic material comprising at least one metal selected from the group consisting of Fe, Cr, Mo, Ni, and Cu, the amount of residual metals in the resultant polycarbonate being (i) 10 ppm or less in total of Fe, Cr and Mo, and (ii) 50 ppm or leas in total of Ni and Cu.
A process for producing a polycarbonate with a residual metal content of (i) 10 ppm or less in total of Fe, Cr, and Mo, and (ii) 50 ppm or less in total of Ni and Cu which comprises transesterifying (A) a dihydroxy compound and (B) a carbonic diester with a water content of 500 ppm or less in a reactor made of metallic material containing at least one metal selected from the group consisting of Fe, Cr, Mo, Ni and Cu.
Dependencies are inferred from the claim text.