Otsuka Chemical Co., Ltd.

Shigeru Sumitomo

Tsukasa Maekawa

Yoshifumi Tachi

Sadafumi Shono

Nobuyuki Ueda

Toshinori Takao

Chiaki Yasumaru

A powder comprising a blowing agent powder core which is coated with at least one oil-like substance on its surface, and a process for producing a powder comprising a blowing agent powder core which is coated with at least one oil-like substance on its surface, comprising the following steps (a) and (b): (a) adding at least one oil-like substance in the form of a mist to a blowing agent powder; and (b) mixing the oil-like substance with the blowing agent powder under such mixing conditions that the blowing agent powder is less susceptible to pulverization.

Blowing agent powder and process for producing the same

It provides a blowing agent which is significantly inhibited from solidification and is exceedingly useful as a blowing agent satisfactory in flowability, dispersibility into resins, and the like, even after the lapse of a prolonged period of time, and a process for producing the same. The blowing agent of the present invention is substantially anhydrous blowing agent, and it is obtained by treating a blowing agent with a surface-treating agent capable of removing water from the blowing agent, followed by optionally heating during or after the treatment.

Substantially anhydrous foaming agent and process for producing the same

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Tokushima, Japan

Shigeru Sumitomo