Dai Nippon Toryo Co., Ltd.

Nippon Steel & Sumikin Anti-Corrosion Co., Ltd.

Tsuyoshi Matsumoto

Masanori Nagai

Hiroshi Kihira

Takayuki Sato

Osamu Ogawa

Takashi Matsuda

Kenji Fujimoto

Atsumi Imai

Takehide Aiga

Yoshihiko Mitsuzuka

Kanjiro Hiramatsu

An inexpensive rotary grinding tool with reduced noise level of the grinding is provided. The rotary grinding tool comprises a metal disk having a grinding surface on at least a part of its surface and a holder for supporting the metal disk. The grinding surface has hard grains having a Mohs hardness in excess of 9 brazed thereon at a surface density of at least 20 grains/cm. The holder has at its center a securing means for securing the holder on rotary shaft of a rotary drive unit. The holder and the metal disk are joined together to constitute the rotary grinding tool.

Rotary grinding tool and its production method

It is an object of the present invention to provide an anticorrosive coating composition which uses a pollution-free (heavy metal-free) rust preventive pigment and exhibits anticorrosive performances equal or superior to those of lead compounds or chromic acid compounds even if the pigment is blended in various binder resins and also to provide an anticorrosive coating composition having excellent storage stability. The present invention relates to an anticorrosive coating composition comprising a binder resin and a pollution-free (heavy metal-free) rust preventive pigment containing a condensed calcium phosphate produced by baking a single substance or mixture of a calcium component and a phosphorous component in the following atomic ratio (Ca/P=m): 0.50&#x3c;m&#x3c;1.00, at 180 to 350&#xb0; C.

Anticorrosive coating compositions

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Tochigi, Japan

Tsuyoshi Matsumoto