Daihachi Chemical Industry Co., Inc.

Sakiko Hamada

Hiroshi Tsuji

Toshiya Hamada

A flame retardant containing an aromatic phosphoric acid ester represented by the general formula (I): wherein Rto R, R, and Reach independently represent a Calkyl group or a Calkoxy group; R, R, and Reach independently represent a Calkyl group or a Calkoxy group; n represents an integer of 1 to 10; nand neach independently represent an integer of 0 to 3; mand meach independently represent an integer of 0 to 4; p represents an integer of 0 to 26; and k represents an integer of 1 to 12; and when p is 2 or more, any two substituents Rmay be bonded to each other, and may be bonded to a carbon atom(s) of a ring to which the above substituents Rare bonded, forming another ring.

Flame retardant containing aromatic phosphoric acid ester, and thermoplastic resin composition containing same

A process for producing a cyclic alkylene phosphorohalidite, which comprises reacting a specific phosphorus trihalide with a specific alkylene glycol compound under conditions where the phosphorus trihalide is present in an excess amount relative to the amount of the alkylene glycol compound in the reaction system to order to obtain the cyclic alkylene phosphorohalidite by reacting the alkylene glycol compound with the phosphorus trihalide; and a process for producing a cyclic phosphoric acid ester by using the obtained cyclic alkylene phosphorohalidite as a raw material.

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Osaka, Japan

Sakiko Hamada