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| Composite silicon carbide sintered shapes and its manufacture |
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| OF THE DRAWINGS FIG. 1 is a schematic cross-sectional line drawing showing a coating in accordance ... |
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| Method for making rare earth metal oxide ceramic precursor compounds and use thereof |
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| Thermal barrier coating systems and materials |
| I claim: 1. A metallic article comprising a metallic substrate having a ceramic thermal barrier ... |
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| Thermal barrier layer and process for producing the same |
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Organic and inorganic composite pigments, and paint and resin composition using the same
| Details |
Inventors: Hayashi, Kazuyuki; Iwasaki, Keisuke; Ohsugi, Mineko; Shimohata, Yusuke; Morii, Hiroko;
Assignee: Toda Kogyo Corporation (Hiroshima-ken, JP)
Primary Examiner: Green; Anthony J.
Assistant Examiner:
Attorney, Agent or Firm: Nixon & Vanderhye P.C.
Organic and inorganic composite pigments having an average particle diameter of 0.01 to 10.0 .mu.m composed of a white inorganic particle, an organosilane compound obtained from alkoxysilanes, or polysiloxanes coating on the white inorganic particle, and an organic pigment coat formed on said coating. An ultraviolet light-absorbing agent is present in any portion from the surface of the white inorganic particle to surface of the organic pigment coat. These composite pigments have reduced amounts of organic pigments desorbed from their surface and exhibit excellent light resistance due to their ultraviolet absorbing property. |
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DETAILED DESCRIPTION OF THE INVENTION The present invention will now be described in detail below.
First, the organic and inorganic composite pigments according to the present invention are described.
As the white inorganic particles, there may be used white pigments such as titanium dioxide and zinc oxide; pearl pigments such as titanium mica and muscovite; and extender pigments such as clay, calcium carbonate, precipitated barium sulfate, alumina white, white carbon and talc.
The white inorganic particles may be appropriately selected from the above-described pigments depending properties required therefor or applications thereof, for example, the white pigments are preferably used in applications requiring a hiding power, the pearl pigments are preferably used in applications requiring pearl-like gloss, and the extender pigments are preferably used in applications requiring a transparency.
The white inorganic particles may be those particles having any suitable shape such as spherical particles, granular particles, polyhedral particles, acicular particles, spindle-shaped particles, rice ball-shaped particles, flake-shaped particles, scale-shaped particles and plate-shaped particles.
The white inorganic particles have an average particle diameter of usually 0.
009 to 9.
95 .
mu.
m, preferably 0.
025 to 9.
45 .
mu.
m, more preferably 0.
045 to 8.
95 .
mu.
m.
When the average particle diameter of the white inorganic particles is more than 9.
95 .
mu.
m, the obtained organic and inorganic composite pigments may become coarse, resulting in deteriorated tinting strength.
When the average particle diameter of the white inorganic particles is less than 0.
009 .
mu.
m, such particles may tend to be agglomerated due to fine particles.
As a result, it may be difficult to adhere the ultraviolet light-absorbing agent onto the surface of the white inorganic particles, to form a uniform coating comprising the organosilane compounds obtainable from alkoxysilanes, or polysiloxanes on the surface of the white inorganic particles, and to uniformly adhere the organic pigments onto the surface of the coating layer
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Manufacturing Materials 
