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Surface coated particles and use of same

A surface coating and particle technology, applied in the pretreatment surface, the device and application of coating liquid on the surface, etc., can solve the problems of uneven white, high specific gravity, high viscosity, etc., and achieve excellent dispersibility and less coarse particles. , Excellent effect of hard caking resistance

Inactive Publication Date: 2015-12-09
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] However, due to the high specific gravity of pigments such as titanium dioxide, there are problems that it is difficult to disperse in a dispersion medium such as water, and it becomes agglomerated and cannot be redispersed due to sedimentation, or it becomes gelatinized and viscous due to the reaction between the particle surfaces. Cannot be used as ink, cause white unevenness, etc.
However, compared with titanium dioxide, silicon dioxide is inferior in both whiteness and opacity, so it is necessary to use titanium dioxide in combination, and as a result, there is a problem that it is difficult to ensure storage stability.

Method used

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  • Surface coated particles and use of same
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  • Surface coated particles and use of same

Examples

Experimental program
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no. 1 Embodiment approach ＞

[0101] Hereinafter, the surface-coated particle and its manufacturing method in the present embodiment will be described in order. In addition, "~" means from above to below unless otherwise specified.

[0102]

[0103] The surface-coated particles according to this embodiment include titanium dioxide particles and a coating film covering the titanium dioxide particles, and the surface-coated particles contain (a) phosphorus element or sulfur element and (b) elements selected from Groups 2 to 12 of the Periodic Table of Elements (but Excluding at least one element of titanium element), when the concentration of titanium element in the above-mentioned surface-coated particles is 100 atom%, the concentration of the above-mentioned (a) element is 2 atom% or more, and the above-mentioned (b) element is relative to the above-mentioned ( a) The atomic ratio (b) / (a) of the element exceeds 0.5.

[0104] In addition, the surface-coated particles of the present embodiment can be obta...

no. 2 Embodiment approach ＞

[0189] According to this embodiment, there is provided a particle containing titanium dioxide particles and at least one element selected from Group 2 to Group 12 elements of the periodic table (but excluding titanium), the specific surface area ( A BET(H2O) ) and the specific surface area (ABET(N2) ) ratio (A BET(H2O) / A BET(N2) ) is 1.0 or more.

[0190] In Patent Document 1, the aqueous dispersibility of titanium dioxide particles is improved by dispersing titanium dioxide particles in the presence of an organic polymer dispersant, but high concentration and low viscosity cannot be achieved.

[0191] In addition, in Patent Documents 2 to 3, whiteness and light scattering efficiency are maintained by surface coating, but there is no description of improvement in water dispersibility of titanium dioxide particles.

[0192] Patent Document 6 also does not describe improvement in water dispersibility of titanium dioxide particles.

[0193] In order to solve the above-mentio...

no. 3 Embodiment approach ＞

[0291] The present embodiment provides a pigment for water-based ink comprising titanium dioxide particles and a coating film covering the titanium dioxide particles, wherein the pigment for water-based ink contains (a) phosphorus element and (b) an , hafnium, magnesium and barium at least one element, the concentration of the titanium element in the above-mentioned water-based ink pigment is set as x (atom%), the concentration of the above-mentioned (a) element is set as y (atom%), and When the concentration of the above-mentioned (b) element is set to z (atom%), the above-mentioned x, y, and z are surrounded by a quadrilateral with the following points A, B, C, and D as vertices in the triangular diagram (x, y, z) in the region (including online).

[0292] A (91, 3, 6)

[0293] B(84, 2, 14)

[0294] C(79,6,15)

[0295] D (79, 9, 12)

[0296] The pigment for water-based ink of this embodiment is excellent in water dispersibility. In addition, when the pigment for water-b...

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Abstract

A surface-coated particle that includes a titanium dioxide particle, and a coating film that covers the titanium dioxide particle, and a method for producing the same, are disclosed. The surface-coated particle includes an element (a) that is phosphorus or sulfur, and an element (b) that is at least one element selected from elements (excluding titanium) respectively belonging to Groups 2 to 12 in the periodic table, the concentration of the element (a) in the surface-coated particle being 2 atom% or more, provided that the concentration of titanium in the surface-coated particle is 100 atom%, and the atomic ratio "(b) / (a)" of the element (b) to the element (a) in the surface-coated particle being more than 0.5.

Description

technical field [0001] The present invention relates to surface-coated particles and their use. Background technique [0002] Titanium dioxide particles have long been used as white pigments. In recent years, it has been used in coatings, cosmetics, various moldings ( Chemical fibers, films, optical materials, etc.). [0003] For such applications, titanium dioxide particles are mixed with various dispersion media to form a slurry, coated or mixed with a resin, and processed into a film or molded body. At this time, in order to efficiently express the intended functions, titanium dioxide is required to be uniformly dispersed in a dispersion medium, resin, or the like. [0004] However, since titanium dioxide is insulating, when it is mixed into a resin, it is easy to form aggregates due to charging (the fluidity of the powder is insufficient), so it is difficult to mix uniformly into the resin (difficult to disperse). In addition, when titanium dioxide is made into a slu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047
CPCC09C1/3661B05D3/0272C01P2002/85C01P2002/86C01P2004/04C01P2004/80C01P2006/12C09D11/037C09D11/322C09D1/00C09D7/61
Inventor 和知浩子江上友纪子前川弘志
Owner SEIKO EPSON CORP
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