Patent Number: 6,294,641

Title: Polycarbonate resin, optical-information recording medium substrate made of the same, and optical-information recording medium

Abstract: A polycarbonate resin having an improved hue is provided, which is suitable for use as a substrate for transfer type optical recording media such as optical disks. The polycarbonate resin is one obtained by reacting starting materials comprising a dihydric phenol, a carbonate material, and a chain terminator comprising a p-(long chain)-substituted phenol (hereinafter referred to as a para isomer), characterized in that the amount of an o-(long chain)-substituted phenol (hereinafter referred to as an ortho isomer) contained as an impurity in the chain terminator used satisfies the following relationship: ##EQU1## (wherein "number of C's" represents the number of carbon atoms in the substituent organic group of the substituted phenols).

Inventors: Miyamoto; Masaaki (Fukuoka, JP), Ueda; Motonori (Okayama, JP), Kuma; Kiyoji (Fukuoka, JP), Uchimura; Ryuji (Fukuoka, JP), Shiraishi; Yoshitaka (Fukuoka, JP)

Assignee: Mitsubishi Chemical Corporation

International Classification: C08G 64/00 (20060101); C08G 64/14 (20060101); G11B 7/24 (20060101); G11B 7/253 (20060101); C08G 064/00 ()

Expiration Date: 09/25/2018