Title:
METHOD FOR PRODUCING BLACK PIGMENT
Document Type and Number:
WIPO Patent Application WO/2021/106907
Kind Code:
A1
Abstract:
A black pigment, which has high infrared reflectance (NIR), while maintaining a black color with an L* value of 30 or less, is required as measures against current global warming. Copper (II) oxide according to the present invention is obtained by: adding an aqueous alkali solution to a solution of copper (II), said aqueous alkali solution being in an amount of not less than the molar neutralization equivalent for the solution of copper (II); aging the resulting mixture for three hours or more, while stirring and maintaining the mixture at temperature of from 20°C to 70°C; and subsequently subjecting the mixture to solid-liquid separation. Consequently, this copper (II) oxide has high NIR, while maintaining a black color. If this copper (II) oxide is heated, the NIR thereof decreases; but if this copper (II) oxide is coated with a polymer such as ammonium polyacrylate, the heat resistance thereof is improved.
Inventors:
KOBAYASHI YUICHI (JP)
Application Number:
PCT/JP2020/043752
Publication Date:
June 03, 2021
Filing Date:
November 25, 2020
Export Citation:
Assignee:
KASAI IND CO LTD (JP)
NAGOYA DENKI EDUCATIONAL FOUND (JP)
NAGOYA DENKI EDUCATIONAL FOUND (JP)
International Classes:
C01G3/02; C09C1/00; C09C3/00; C09D17/00
Foreign References:
| US20010051103A1 | 2001-12-13 | |||
| CN102320644A | 2012-01-18 | |||
| JPH0812327A | 1996-01-16 | |||
| JPH0929266A | 1997-02-04 | |||
| JPS57137366A | 1982-08-24 | |||
| JP2010150353A | 2010-07-08 |
Attorney, Agent or Firm:
KONISHI Tomimasa (JP)
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