PURPOSE: To obtain a high-softening point, transparent polyester, by polycondensing a dicarboxylic acid with a glycol in the presence of a glycol-soluble Mn, Mg or Ca compound and an alkali metal compound, the last two being used at a specified mol ratio.
CONSTITUTION: The purpose polyester is obtained by mixing and reacting (A) a terephthalic acid-based dicarboxylic acid component or its esterifiable derivative, (B) an ethylene glycol-based glycol component, (C) about 0.015W1mol%, based on formed polyester, glycol-soluble metallic compound selected from Mn, Mg and Ca compounds (e.g., manganese chloride, manganese acetate), (D) a glycol-soluble alkali metal compound (e.g., lithium chloride, sodium ethylate) in an amount satisfying the formula, wherein M is the total number of mols of component C and A is that of component C and (E) a necessary polymerization catalyst.
MORITA TOORU
OKASAKA HIDESADA
| JP33001646A | ||||
| JP37012148A | ||||
| JPS5183651A | 1976-07-22 |