Adeka Corporation

Masaru Nagahama

Kazumasa Tanaka

Hisashi Murase

Yuki Tanaka

Tetsuo Kamimoto

Ryoji Kimura

Takayoshi Kaneda

Akihiro Yamaki

Ryusuke Mitamura

Kenichi Yoshikawa

Sinji Nakano

The invention provides a flame retardant composition comprising 1-99 weight parts of a salt of piperazine and an inorganic compound selected from among piperazine phosphate, piperazine pyrophosphate and piperazine polyphosphate, or a mixture of two or more of these piperazine salts (ingredient (A)), 99-1 weight parts of a salt of melamine and an inorganic compound selected from among melamine phosphate, melamine pyrophosphate and melamine polyphosphate, or a mixture of two or more of these melamine salts (ingredient (B)) (wherein, the sum of ingredient (A) and ingredient (B) is 100 weight parts), 0-50 weight parts of an arbitrary ingredient (ingredient (C)), and 0.01-20 weight parts of a silicone oil having a viscosity at 25&#xb0; C. of 5000 mm/s (ingredient (D)) which is added thereto. This flame retardant not only has superior flame retarding properties, but also has enhanced powder properties and anti-hygroscopic properties, and when it is added to a resin, there is little change of electrical resistance.

Flame retardant composition with improved fluidity, flame retardant resin composition and molded products

The present invention provides piperazine pyrophosphate represented by chemical formula (I) which has a sodium content of 10 ppm or lower and a process of producing the same. The piperazine pyrophosphate has high purity and provides a flame retardant composition exhibiting excellent flame retardancy. The process includes dehydration condensation of piperazine diphosphate and is able to produce the piperazine pyrophosphate at low cost. 

High purity piperazine pyrophosphate and process of producing same

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Saitama, Japan

Masaru Nagahama