Polycarbonate resin for substrate of optical recording medium

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate

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528198, C08G 6400

Patent

active

061661678

ABSTRACT:
A polycarbonate resin obtained by polymerizing an aromatic diol and a carbonate-forming compound using a monophenolic compound as a molecular weight modifier, wherein said polycarbonate resin contains from 0.2 to 2% by weight of a low-molecular weight compound represented by formula (I): ##STR1## wherein R.sup.1 represents an aromatic diol residue; and R.sup.2 represents a monophenolic compound residue, and wherein said polycarbonate resin provides less amount of low-molecular weight volatile matters even when heated or injection-molded. When heated at 350.degree. C. under reduced pressure of 1 mmHg for 20 minutes, the proportion of the low-molecular weight compound of formula (I) which volatilizes is not more than 0.2% by weight based on the weight of said low-molecular weight compound of formula (I) present in the polycarbonate resin. When heated at 400.degree. C. under reduced pressure of 1 mmHg for 30 minutes, the proportion of the low-molecular weight compound of formula (I) which volatilizes is not more than 2% by weight based on the low-molecular weight compound of formula (I) present in the polycarbonate resin.

REFERENCES:
patent: 4880896 (1989-11-01), Otsubo et al.
patent: 4959456 (1990-09-01), Ashida et al.

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