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:
Jan. 18, 1983
Filed:
Oct. 24, 1980
Hazime Mori, Kitakyushu, JP;
Katsuhisa Kohyama, Kitakyushu, JP;
Katsuhiko Nakamura, Kitakyushu, JP;
Katsuyuki Sakata, Nakama, JP;
Akira Matsuno, Kitakyushu, JP;
Mitsubishi Chemical Industries Limited, Tokyo, JP;
Abstract
A process for producing an aromatic polyesterpolycarbonate, which comprises polycondensing (a) a dihydroxydiaryl compound, (b) a terephthaloyl chloride and/or isophthaloyl chloride reactant, and (c) phosgene by an interfacial polymerization process in the presence of water, methylene chloride and an acid binding agent thereby preparing an aromatic polyesterpolycarbonate product containing structural units of the formula: ##STR1## wherein X is a divalent group, and the aromatic rings may be substituted, and structural units of the formula: ##STR2## wherein X is a divalent group, and the aromatic rings may be substituted, said condensation reaction being characterized in that after at least 95% of the total --COCl groups in the terephthaloyl chloride and/or isophthaloyl chloride and phosgene starting materials has reacted, a chloroformate compound or additional phosgene is added to the reaction mixture in an amount to bring the concentration of --COCl groups to a level of 10 to 1000 .mu.eq/g relative to the total amount of the above starting materials to complete the reaction.