The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 02, 1998
Filed:
Dec. 12, 1996
Satoshi Inoki, Otake, JP;
Yoshio Motoyama, Ono-machi, JP;
Hideto Matsuoka, Wagi-machi, JP;
Hajime Oyoshi, Iwakuni, JP;
Michio Tanaka, Otake, JP;
Tomoaki Shimoda, Moka, JP;
Akio Kanezawa, Sodegaura, JP;
Kazutoyo Uno, Chiba, JP;
General Electric Company, Pittsfield, MA (US);
Abstract
A manufacturing method for polycarbonate comprising �I! a process for manufacturing diaryl carbonate from an aromatic hydroxy compound and an aromatic hydroxy compound, �II! a process for manufacturing polycarbonate by solution polymerization of the diaryl carbonate obtained in �II! and an aromatic dihydroxy compound in the presence of a catalyst comprising a nitrogen-containing basic compound, and �III! a process for separating and removing the nitrogen-containing compound from the aromatic hydroxy by-products in �II! and returning the resultant aromatic hydroxy compounds to process �I! effectively reuses aromatic hydroxy by-products (e.g., phenols) of polycarbonate manufacturing to manufacture diaryl carbonate, while suppressing the production of alkyl aromatic ethers and then uses this diaryl carbonate to manufacture polycarbonate with good productivity.