Title:
アルミナ粉末、その製造方法、及びそれを用いた樹脂組成物
Document Type and Number:
Japanese Patent JP5903136
Kind Code:
B2
Abstract:
To provide an alumina powder having an improved flowability, a process for its production, and a resin composition employing it. An alumina powder which has an ±-phase content of at most 40% as measured by the following method, an average circularity of at least 0.95 in each of the particle size range of from 45 to 200 µm and the particle size range of less than 45 µm, and an average particle size of at most 100 µm:
[method for measuring ±-phase content]
Powders prepared by mixing ±-phase alumina powder and ¸-phase alumina powder in mass ratios of 0:10, 5:5 and 10:0, respectively, are subjected to X-ray diffraction measurements, whereupon the integrated intensity of a peak of ±-phase detected in the vicinity of 2¸=43' is calculated, and a calibration line of the integrated intensity plotted against the mixing ratio is made; and then, a sample of the alumina powder is subjected to an X-ray diffraction measurement, whereupon the integrated intensity of a peak in the vicinity of 2¸=43° is calculated, and the ±-phase content is obtained from the calibration line.
Inventors:
Takaaki Tanaka
Osamu Kunitomo
Takahisa Mizumoto
Ezaki Kotobuki
Akinori Shimokawa
Osamu Kunitomo
Takahisa Mizumoto
Ezaki Kotobuki
Akinori Shimokawa
Application Number:
JP2014165173A
Publication Date:
April 13, 2016
Filing Date:
August 14, 2014
Export Citation:
Assignee:
Denka Co., Ltd.
International Classes:
C01F7/02; C01F7/027; C08K3/22; C08L101/00
Domestic Patent References:
| JP2001019425A | ||||
| JP2005306718A | ||||
| JP2002348116A | ||||
| JP2005281063A |
Foreign References:
| WO2009133904A1 |
Attorney, Agent or Firm:
Kenji Izumina
Toshiharu Ogawa
Toshiharu Ogawa