| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a flame-retardant copolyester which, when formed into a film, has excellent flame retardancy and dimensional stability and is particularly suitably used as a base film for flexible electronic devices such as a flexible printed circuit board. <P>SOLUTION: The flame-retardant copolyester comprises aromatic dicarboxylic acid components represented by formula (I): HO(O)C-R<SP>2</SP>-OR<SP>1</SP>O-R<SP>2</SP>-C(O)OH (wherein R<SP>1</SP>is a 2-10C alkylene group and R<SP>2</SP>is a 2,6-naphthalenediyl group) and formula (II): HO(O)C-R<SP>3</SP>-C(O)OH (wherein R<SP>3</SP>is a phenylene group or a naphthalenediyl group) and a 2-4C alkylene glycol component. A copolymerization ratio of the aromatic dicarboxylic acid component represented by formula (I) is 5-80 mol% based on all dicarboxylic acid components, and furthermore an organic phosphorus compound is copolymerized for the phosphorus element content in the copolyester of 0.3-1.5 wt.%. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
