Nissan Chemical Industries Limited

Kouji Shishido

Masuo Shindo

Keitaro Suzuki

Yoshitane Watanabe

Masayuki Teranishi

Hiroshi Ozaki

Masayoshi Shirakawa

Motohide Kitahara

Shinichi Yuki

Melamine polymetaphosphate and process for its production

A melamine cyanurate powder composed of readily dispersible aggregated primary particles of melamine cyanurate surface-treated with a metal oxide.

Surface-treated melamine cyanurate powder and process for its production

The present invention provides a power flame retardant for a halogen-containing vinyl resin, which comprises the following Components A, B and C. (A) 5 to 30 parts by weight of at least one of alkali metal compound of lithium, sodium and potassium calculated as the formula M.sub.2 O where M is an alkali metal; (B) 0.2 to 10 parts by weight of a perchloric acid radical in the form of the acid or a salt or amine thereof, calculated as perchloric acid radical; and (C) 1 to 50 parts by weight of a hydrophobic dispersing agent having a boiling point or a decomposition temperature of 200.degree. C. or higher. All the parts by weight are based on 100 parts by weight of antimony pentoxide (Sb.sub.2 O.sub.5). The flame retardant of the present invention does not impair transparency of the halogen-containing vinyl resin, and also does not worsen various physical properties such as thermal stability and weathering resistance. The invention also provides (1) flame retardant halogen containing resins and (2) a process for preparing the powdered flame retardant.

Flame retardant for halogen-containing vinyl resins

Disclosed is a method of producing porous vitrified grinder, where melamine cyanurate is used as a pore-imparting agent. The grinder has a long life and has an improved grinding capacity.

Method of producing porous vitrified grinder

Growing community of inventors

Toyama, Japan

Kouji Shishido