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Zinc oxide powder, dispersion, paint, and cosmetic

a technology of dispersion and zinc oxide powder, applied in the direction of pigment pastes, pigment treatment with organosilicon compounds, coatings, etc., can solve the problems of yellowing of zinc oxide powder, impairing the appearance of paints or cosmetics, etc., and achieves suppressed coloration, high transparency, and suppressed coloration

Active Publication Date: 2022-06-02
SUMITOMO OSAKA CEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a zinc oxide powder with specific surface area between 1.5 m2 / g and 65 m2 / g that has a high degree of coloration when energy is applied to it. However, when dispersed in a dispersion or paint, the zinc oxide powder's coloration is suppressed even at high energy levels. The result is a highly transparent and coloration-suppressed product. The same applies to cosmetics that contain this zinc oxide powder or dispersion.

Problems solved by technology

However, even a zinc oxide powder having a high degree of whiteness had a problem in that the zinc oxide powder turns yellow or the like and impairs the appearances of paints or cosmetics when energy is applied to blend the zinc oxide powder into the paints or the cosmetics.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0205]A zinc oxide powder A1 (BET specific surface area: 39.8 m2 / g, apparent specific volume measured by loose packing method: 5.2 mL / g, apparent specific volume measured by tapping method: 2.9 mL / g, A1 / E2 in Formula (1): 0.17, a in Formula (1): 0.003, (M2−M1) / E2 in Formula (2): 0.081, and crystallite diameter: 16 nm) was prepared. The above-described characteristic, crystallite diameter, BET-converted particle diameter, amount of transition metals, and the like of the zinc oxide powder A1 are shown in Table 1.

[0206]Next, in order to evaluate coloration, the zinc oxide powder A1 (500 g) was cracked by 16000 rotations in a hammer mill until D98 became 500 μm or less. That is, a high energy was applied to the zinc oxide powder A1.

[0207]L*,a*,b* of the zinc oxide powder A1 before and after the cracking were measured with a spectroscopic color difference meter (Model No. TC-1800, manufactured by Tokyo Denshoku. Co., Ltd.).

[0208]In addition, W* that is calculated from Formula (3) and ind...

example 2

[0225]Instead of the zinc oxide powder A1, a zinc oxide powder A2 (BET specific surface area: 29.6 m2 / g, apparent specific volume measured by loose packing method: 5.1 mL / g, apparent specific volume measured by tapping method: 2.7 mL / g, A1 / E2 in Formula (1): 0.16, a in Formula (1): 0.004, (M2−M1) / E2 in Formula (2): 0.096, and crystallite diameter: 21 nm) was prepared. A surface-treated zinc oxide powder B2 of Example 2 and a dispersion C2 containing the surface-treated zinc oxide powder B2 were obtained in completely the same manner as in Example 1 except the use of the zinc oxide powder A2. The results of the same evaluations as in Example 1 are shown in Table 1.

example 3

[0226]Instead of the zinc oxide powder A1, a zinc oxide powder A3 (BET specific surface area: 34.6 m2 / g, apparent specific volume measured by loose packing method: 6.4 mL / g, apparent specific volume measured by tapping method: 2.9 mL / g, A1 / E2 in Formula (1): 0.12, a in Formula (1): 0.002, (M2−M1) / E2 in Formula (2): 0.093, and crystallite diameter: 18 nm) was prepared. A surface-treated zinc oxide powder B3 of Example 3 and a dispersion C3 containing the surface-treated zinc oxide powder B3 were obtained in completely the same manner as in Example 1 except the use of the zinc oxide powder A3. The results of the same evaluations as in Example 1 are shown in Table 1.

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Abstract

A zinc oxide powder in which a BET specific surface area (X) of the powder is 1.5 m2 / g or more and 65 m2 / g or less, a value obtained by a formula: an apparent specific volume (mL / g) measured by a loose packing method of the zinc oxide powder / an apparent specific volume (mL / g) measured by a tapping method of the zinc oxide powder is 1.5 or more and 2.5 or less, and Formula (1) and Formula (2) shown below are satisfied.A1 / E2=aX+0.06  (1)(M2−M1) / E2≥0.02  (2)

Description

FIELD OF THE INVENTION[0001]The present invention relates to a zinc oxide powder, a dispersion, a paint, and a cosmetic.[0002]This application claims the benefit of Japanese Patent Application No. 2020-198905 filed on Nov. 30, 2020, the disclosure of which is herein incorporated by reference in its entire.BACKGROUND OF THE INVENTION[0003]Zinc oxide has an ultraviolet-shielding function, a gas transmission-suppressing function, and the like and is also highly transparent. Therefore, zinc oxide is used for applications requiring transparency such as ultraviolet-shielding films, ultraviolet-shielding glass, cosmetics, and gas barrier films.[0004]Zinc oxide powders that are blended into paints or cosmetics are ordinarily required to have a high degree of whiteness. This is because zinc oxide powders having a low degree of whiteness cause coloration or affect the appearance of paints or cosmetics when blended into the paints or cosmetics.[0005]For example, Patent Document 1 proposes zinc...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09C1/04C09C3/12C09D17/00C09D7/62A61K8/02A61K8/58A61K8/04A61Q17/04
CPCC09C1/043C08K9/06C09D17/007C09D7/62A61K8/022A61K8/585A61K8/04A61Q17/04C01P2006/12C01P2006/11C01P2002/82C01P2006/80C01P2002/60C01P2006/62C01P2006/63C01P2006/64C09C3/12C01P2004/64C01G9/02C09D5/028A61K8/27A61Q19/00A61K2800/10A61K8/0241A61K2800/413A61K2800/61C08K2003/2296C08K2201/006C09D7/61A61K2800/43A61K2800/41
Inventor NEYA, TADASHINOBE, MASAHIROSUMA, SYUNSUKE
Owner SUMITOMO OSAKA CEMENT CO LTD
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