Process for producing aromatic-aliphatic copolycarbonate
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsHiromitsu Nagashima, Shu Yoshida, Satoshi Nagai, Yoshinori Isahaya
Life of this patent
Estimating the term…
Abstract
A process for producing an aromatic-aliphatic copolycarbonate which is excellent in impact resistance and heat resistance and has large Abbe number, small photoelasticity constant, and excellent color tone. The process comprises conducting polycondensation in a reactor made of a stainless steel comprising at least 12 wt % nickel, at least 22 wt % chromium, and at least 50 wt % iron.
Claims4
A process for producing an aromatic-aliphatic copolycarbonate which comprises subjecting an aromatic dihydroxy compound represented by the following formula (1), tricyclo [5.2.1.02,6] decanedimethanol represented by the following formula (2), and a carbonic diester to melt polycondensation to produce an aromatic-aliphatic copolycarbonate, wherein the melt polycondensation is conducted in a reactor made of a stainless steel comprising at least 12 wt % nickel, at least 22 wt % chromium, and at least 50 wt % iron:
- R1 and R2 each represent a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or a halogen atom;
- m and n, each indicating the number of substituents, each are an integer of 0 to 4;
- and R3 and R4 each represent a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or a phenyl group, provided that R3 and R4 may be bonded to each other to form a ring.
Dependencies are inferred from the claim text.