Mitsubishi Gas Chemical Company, Inc.

Junichi Edahiro

Tatsuya Hasegawa

Kazuto Ikemoto

Hitoshi Sakamoto

Hajime Shimizu

Masahiko Nakano

Yasuhiro Kushida

Tatsuya Yamauchi

Takami Morishita

A crystal of pyrroloquinoline quinone disodium salt having peaks at 2&#x3b8; of 9.1&#xb0;, 10.3&#xb0;, 13.8&#xb0;, 17.7&#xb0;, 18.3&#xb0;, 24.0&#xb0;, 27.4&#xb0;, 31.2&#xb0; and 39.5&#xb0; (&#xb1;0.2&#xb0; for each) in powder X-ray diffractometry using Cu K&#x3b1; radiation, or a crystal of pyrroloquinoline quinone trisodium salt having peaks at 2&#x3b8; of 6.6&#xb0;, 11.4&#xb0;, 13.0&#xb0;, 22.6&#xb0;, 26.9&#xb0;, 27.9&#xb0;, 37.0&#xb0;, 38.9&#xb0; and 43.4&#xb0; (&#xb1;0.2&#xb0; for each) in powder X-ray diffractometry using Cu K&#x3b1; radiation.

Crystals of pyrroloquinolinequinone sodium salts

The present invention provides a method for producing a polyester resin comprising dicarboxylic acid units and diol units, wherein at least a portion of the diol units is a diol unit having a cyclic acetal skeleton, the method comprising specific steps (1) to (4-2).

Method for producing polyester resin

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Niigata, Japan

Junichi Edahiro