PURPOSE: A melt-moldable aromatic polyester capable of forming moldings having excellent mechanical properties and optical anisotropy, prepared by substituting 4,4'-diphenyldicarboxylic acid for the terephthalic acid of a polyester comprising phenylhydroquinone and terephthalic acid.
CONSTITUTION: A polyester consisting of structural units of formula I and structural units of formula II, wherein R is a group of formula III, IV or V, wherein said structural units (formula I ) account for 20W100mol% of the total and said structural units (formula II) account for 0W80mol% of the total, said structural units (formula I ) show the units of a polyester formed from phenylhydroquinone and 4,4'-diphenyldicarboxylic acid, and structural units (formula II) show the structural units of a polyester formed from phenylhydroquinone and other aromatic dicarboxylic acids than 4,4'-diphenyldicarboxylic acid.
| JPS5114996 | HORIESUTERUNO SEIZOHOHO |
| JP2683337 | [Title of Invention] Optical Pickup |
OKAMOTO MASARU
HIRAI TOSHIMASA
