Shimadzu Corporation

Other

Yasumasa Horibe

Hisashi Okuyama

Takashi Kawabe

Tatsushi Kawamoto

Makoto Ogaito

Hitomi Ohara

Yoshihito Suwa

Yasuhiro Fujii

Toner used for electrophotography includes a polylactic acid type biodegradable resin and a terpene-phenol copolymer. The molar concentration of one of the L-lactic acid units and D-lactic acid units in a lactic acid component of the polylactic acid type biodegradable resin is in the range between about 75 mol % and about 98 mol %. The terpene-phenol copolymer may include at least one composition selected from the group consisting of: (a) cyclic terpene-phenol copolymer, prepared by copolymerizing cyclic terpene and phenol; (b) cyclic terpene/phenol (1:2 molar ratio) addition product, prepared by adding two molecules of phenol to one molecule of cyclic terpene (c) polycyclic terpene/phenol (1:2 molar ratio) addition product, prepared by a condensation reaction of the cyclic terpene/phenol (1:2 molar ratio) addition product with one of aldehyde and ketone, and (d) polycyclic terpene/phenol (1:1 molar ratio) addition product, prepared by a condensation reaction of a cyclic terpene/phenol (1:1 molar ratio) addition product with one of aldehyde and ketone. The toner of the invention is applicable to a full-color toner.

Toner for electrophotography

Method for purifying lactide and lactide for food additives

A lactic acid based by-product formed in a process of producing a lactic acid based composition is subjected to racemization in the presence or absence of a catalyst to thereby obtain a lactic acid component having substantially optical inactivity. Then, lactide or polylactic acid having optical inactivity can be obtained from the lactic acid component having the optical inactivity. The obtained lactide or polylactic acid is mixed with lactide or polylactic acid having an optical purity in a range of 90 to 100% e.e. at a predetermined ratio to thereby obtain lactide or polylactic acid having a desired optical purity.

Methods of reproducing lactic acid components by using lactic acid based

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Kyoto, Japan

Yasumasa Horibe