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US 6,472,498 B2Granted
Diaryl carbonate product and production of polycarbonate
AssigneeUbe Industries, Ltd.
InventorsRyoji Sugise, Shuji Tanaka, Kohichi Kashiwagi, Takashi Doi, Hirofumi Ii, Masayuki Nishio, Shinichi Yoshida, Yutaka Asada, Kazuo Miyamoto
Life of this patent
Estimating the term…
Abstract
A composition consisting essentially of a diaryl carbonate and contains a furan ring-containing compound in an amount of not more than 1 ppm is favorably employable for producing less colored polycarbonate.
Claims20
A composition comprising a major portion of a diaryl carbonate and benzofuran-2,3-dione which can have one or more substituents on a benzene ring moiety thereof, in an amount of not more than 1 ppm.
Dependencies are inferred from the claim text.