Toda Kogyo Corporation

Sumitomo Electric Industries, Limited

Kazutoshi Sanada

Shigehisa Yamamoto

Akinori Yamamoto

Shinsuke Maruyama

Nanao Horiishi

Yasuhiko Fujii

Masatoshi Kuroda

Hiroshi Akai

Ryuji Fujita

Takahisa Yamashita

Kazushi Nishimoto

The present invention relates to an infrared reflecting blue pigment comprising a composite oxide comprising Co, Al and Mg, wherein a content of Mg in the blue pigment is 11 to 22% in terms of a molar ratio thereof based on whole metal element present in the blue pigment, and the blue pigment has a BET specific surface area of 10 to 100 m/g; and an infrared reflecting green pigment comprising a composite oxide comprising Co, Al, Mg and Fe, wherein a content of Mg in the green pigment is 11 to 22% in terms of a molar ratio thereof based on whole metal element present in the green pigment, a content of Fe in the green pigment is 0.5 to 20% in terms of a molar ratio thereof based on whole metal element present in the green pigment, and the green pigment has an average particle diameter of 0.02 to 1.2 &#x3bc;m.

Infrared reflecting blue pigment, infrared reflecting green pigment, paint and resin composition using the infrared reflecting blue pigment, and paint and resin composition using the infrared reflecting green pigment

Ceramic powder having a BET specific surface area within a range of from 0.1 to 2.0 m/g as measured according to the Nabsorption method and an average particle diameter within a range of from 0.8 to 100 &#x3bc;m and composed of titanium oxide or a titanate; a dielectric composite material containing a synthetic resin and the ceramic powder; and a dielectric antenna with an antenna part formed of a conductor circuit provided on a dielectric substrate formed from the dielectric composite material.

Ceramic powder, dielectric composite material containing the ceramic powder, and dielectric antenna

The present invention relates to an infrared reflecting blue pigment comprising a composite oxide comprising Co, Al and mg, wherein a content of Mg in the blue pigment is 11 to 22% in terms of a molar ratio thereof based on whole metal element present in the blue pigment, and the blue pigment has a BET specific surface area of 10 to 100 m/g; and an infrared reflecting green pigment comprising a composite oxide comprising Co, Al, Mg and Fe, wherein a content of Mg in the green pigment is 11 to 22% in terms of a molar ratio thereof based on whole metal element present in the green pigment, a content of Fe in the green pigment is 0.5 to 20% in terms of a molar ratio thereof based on whole metal element present in the green pigment, and the green pigment has an average particle diameter of 0.02 to 1.2 &#x3bc;m.

The present invention provides an inexpensive infrared reflecting black pigment which comprises Fe and Mn but comprises no harmful elements, and exhibits an excellent infrared reflecting property. The infrared reflecting black pigment according to the present invention comprises a compound comprising Fe, Mn and at least one element selected from the group consisting of Mg, Al, Ca, Si, Sr and Ba, and has a blackness (L* value) of not more than 30 and a solar radiation reflectance of not less than 15%.

Infrared reflecting black pigment, and paint and resin composition using the infrared reflecting black pigment

The present invention relates to an infrared reflecting black pigment which comprises a composite oxide containing Fe, Co and at least one metal selected from the group consisting of Al, Mg, Ca, Sr, Ba, Ti, Zn, Sn, Zr, Si and Cu; has an average plate surface diameter of 0.02 to 5.0 &#x3bc;m, a blackness (L* value) of not more than 30, an average reflectance of not more than 10% in a visible light wavelength range of 250 to 780 nm and an average reflectance of not less than 35% in an infrared wavelength range of 780 to 2500 nm. There is provided an infrared reflecting black pigment which is capable of producing a heat-shielding paint containing no harmful elements and exhibiting an excellent infrared reflecting property.

Infrared reflecting black pigment, paint and resin composition

The present invention relates to plate-like ferrite particles with magnetoplumbite structure having a composition represented by the general formula of AO.multidot.n{(Fe.sub.1-(a+b) Bi.sub.a M.sub.b).sub.2 O.sub.3 } wherein A is Ba, Sr or Ba--Sr; M is Zn--Nb, Zn--Ta or Zn--Sn; n is from 5.5 to 6.1; a is from 0.001 to 0.005; b is from 0.050 to 0.120; and the ratio of b/a is from 20 to 50. The plate-like ferrite particles with magnetoplumbite structure have an appropriate particle size, a low coercive force, a large saturation magnetization, a small switching field distribution (S.F.D.) and an excellent temperature stability, and a magnetic card containing the plate-like ferrite particles with magnetoplumbite structure.

Plate-like ferrite particles with magnetoplumbite structure and magnetic

Disclosed herein is magneto-plumbite ferrite particles for magnetic cards, which are represented by the following general formula:

Magneto-plumbite ferrite particles for magnetic card, process for

Disclosed herein are Ba-containing plate like magnetoplumbite type ferrite particles for magnetic recording having the composition of AO.n{(Fe.sub.1-X M.sub.X).sub.2 O.sub.3 } (wherein A represents Ba or Ba and Sr, M represents Zn and Ti, or Zn, Co and Ti, n=6.5-11.0, and x=0.05-0.25) and the change of coercive force of said particles at a temperature of 20.degree.-120.degree. C. in the range of -2.0 Oe/.degree.C. to +2.0 Oe/.degree.C., and magnetic recording media using the same.

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Otake, Japan

Kazutoshi Sanada