Mitsubishi Chemical Corporation

Motohiro Munakata

Yutaka Yatsugi

Michio Higashijima

Naoki Yukita

Toru Mori

Toshio Akai

Hitoshi Nimura

Toshio Kambe

Takeshi Ogawa

Toru c/o Mitsubishi Chemical Corporation Mori

Toshio Mitsubishi Chemical Group Akai

Hitoshi c/o Mitsubishi Chemical Group Nimura

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.

Catalyst for polyester polycondensation and method for producing polyester resin using the same

A method for producing a polyester resin composition C), which comprises melt-kneading a polyester resin (A) which satisfies the following formulae (1), (2) and (3) and a polyester resin (B) which satisfies the following formula (4):P1&#x2267;10&#x2003;&#x2003;(1)0.1&#x2266;Ge1&#x2266;1.5&#x2003;&#x2003;(2)0.001&#x2266;Ge1/P1&#x2266;0.15&#x2003;&#x2003;(3)0&#x2266;P2/Ti1&#x2266;80&#x2003;&#x2003;(4)provided that in the formulae (1), (2) and (3), P1 is the content (mol) of phosphorus atoms and Ge1 is the content (mol) of germanium atoms, per ton of the polyester resin (A), and in the formula (4), P2 is the content (mol) of phosphorus atoms and Ti1 is the content (mol) of titanium atoms, per ton of the polyester resin (B). A polyester resin composition (C) obtained by the method, and a molded product such as a film made from such a composition are also provided.

Polyester resin composition, process for producing the same and molding thereof

The invention relates to a liquid catalyst solution containing 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.

To provide a catalyst for production of a polyester, a process for producing a polyester using the catalyst and a titanium-containing polyethylene terephthalate having excellent characteristics. A catalyst for production of a polyester, characterized by comprising at least (1) a Group 4A compound (hereinafter referred to as compound (1)), (2) a compound of at least one element selected from the group consisting of magnesium, calcium and zinc (hereinafter referred to as compound (2)) and an oxygen-containing organic solvent. A process for producing a polyester using this catalyst. A titanium-containing polyethylene terephthalate, having characteristics represented by the following (A), (B) and (C):

Catalyst for production of polyester, process for producing polyester using it and titanium-containing polyethylene terephthalate

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Mie, Japan

Motohiro Munakata