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AssigneeRinkagaku Kogyo Co., Ltd.
InventorsIchiro Sakon, Masao Sekiguchi, Atsushi Kanayama
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A flame retardant comprising of spherical red phosphorus free of pulverized face which is directly produced in the form of fine powder by conversion of yellow phosphorus, without pulverizing process. The red phosphorus characterized by its surface state and shape entirely different from any prior pulverized red phosphorus has not only a high flame retarding ability, but also a superior combination of chemical and physical properties, particularly with regard to corrosion resistance, moisture resistance, mechanical strength and dielectric properties which make it highly valuable and useful as a flame retardant for various nonflammable resinous compositions used in electric articles including electronic parts, machines, automobiles and buildings. The flame retardant is desirably coated with thermosetting resin and/or hydroxide of aluminum and/or zinc, thereby greatly improved in its stability.
A flame retardant comprising spherical particles consisting of red phosphorus and aggregates of said spherical particles, said particles having been directly produced as red phosphorus powder in the form of spherical particles free of pulverized surfaces by conversion of yellow phosphorus, without a pulverizing treatment, said flame retardant having an ignition temperature of at least 345.degree. C.
A flame retardant comprising:
Dependencies are inferred from the claim text.