Catalyst for polyester polycondensation and method for producing polyester resin using the same
AssigneeMitsubishi Chemical Corporation
InventorsMichio Higashijima, Yutaka Yatsugi, Naoki Yukita, Motohiro Munakata
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Abstract
The invention provides: a polycondensation catalyst for polyester production, which contains titanium atoms, alkaline earth metal atoms and phosphorus atoms, has high reactivity and excellent long-term storage stability, can be easily produced industrially, and has an advantage in cost; a polyester resin obtained with the catalyst; and a molded article. These are: a polymerization catalyst for polyester production containing titanium atoms, alkaline earth metal atoms and phosphorus atoms and having a specific constitution; a polyester resin obtained with the catalyst; and a molded article.
Claims7
A process for producing a liquid polycondensation catalyst comprising titanium, an alkaline earth metal and phosphorus, said process comprising:
- (i) mixing an alcohol, an alkaline earth metal compound and an acid phosphoric ester compound to obtain a mixture solution;
- and
- (ii) mixing a titanium compound with the mixture solution obtained in (i);
- wherein the acid phosphoric ester compound is a diester of formula (I)
- wherein R and R′ each independently represent an alkyl group having 1-6 carbon atoms, a cycloalkyl group, an aryl group or a 2-hydroxyethyl group.
Dependencies are inferred from the claim text.