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Decorative coating

A decorative coating, radar device technology, applied in coatings, polyester coatings, polycarbonate coatings, etc., to achieve the effect of gloss improvement

Inactive Publication Date: 2016-06-08
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when such a decorative coating is used for a long time, the decorative coating is exposed to light (affected by light energy)

Method used

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  • Decorative coating
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052]

[0053] 220 g of silver nitrate and 3.3 g of bismuth nitrate were mixed with each other, 597 g of aminoalcohol (reducing agent) and 80 g of DISPERBYK190 (dispersant: manufactured by BYK-Chemie Japan K.K.) were added thereto, and these components were heated at 60° C. Heat and mix with each other for 120 minutes. As a result, Ag-Bi alloy fine particles were deposited and ultrafiltered through an ultrafiltration membrane (UF membrane) at room temperature for 3 hours. The average particle size of the obtained Ag-Bi alloy fine particles was 16 nm, the crystallite size of the Ag-Bi alloy was 14 nm, and the content of bismuth was 2.4% by mass of the Ag-Bi alloy.

[0054] Next, a compounding agent was prepared by mixing 40 grams of propylene glycol monoethyl ether, 8.86 grams of styrene, 8.27 grams of ethylhexyl acrylate, 15 grams of lauryl methacrylate, 34.8 grams of 2-hydroxyethyl methacrylate, 3.07 grams A polymerization initiator of methacrylic acid, 30 g of acidphosph...

Embodiment 2

[0056]

[0057]A decorative coating was formed in the same method as in Example 1. Example 2 differs from Example 1 in that: Ag fine particles formed of silver were prepared without adding bismuth nitrate; and the amount of the dispersant was reduced. Specifically, in the preparation of Ag fine particles, 597 g of aminoalcohol (reducing agent) and 27 g of DISPERBYK190 (dispersant: manufactured by BYK-Chemie Japan K.K.) were added to 220 g of silver nitrate and these components were They were heated and mixed with each other at 60° C. for 120 minutes to deposit Ag fine particles. The deposited Ag fine particles were filtered through a UF membrane for 3 h at room temperature. The average particle size of the obtained Ag fine particles was 19 nm, and the crystallite size of Ag was 16 nm. The Ag fine particles were mixed with the binder resin so that the content of the Ag fine particles was 95% by mass of the total amount of the decorative coating.

Embodiment 3

[0058]

[0059] A decorative coating was formed in the same method as in Example 1. Example 3 differs from Example 1 in that: Ag fine particles formed of silver were prepared without adding bismuth nitrate; the amount of dispersant was reduced; the composition of the binder resin was changed; and the use of a spin coater to form the decoration was changed. Heat treatment conditions after coating.

[0060] Specifically, as in Example 2, during the preparation of Ag fine particles, 597 g of amino alcohol (reducing agent) and 27 g of DISPERBYK190 (dispersant: manufactured by BYK-Chemie Japan K.K.) were added to 220 g of nitric acid Ag and these components were heated at 60°C and mixed with each other for 120 minutes to deposit Ag fine particles. The deposited Ag fine particles were filtered through a UF membrane for 3 h at room temperature. From this point of view, Embodiment 3 is the same as Embodiment 2.

[0061] Further, by mixing 3.16 g of PlameezWY (manufactured by Orig...

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Abstract

Provided is a decorative coating which is formed on a surface of a resin substrate (20) placed on a path of electromagnetic waves of a radar device. The decorative coating includes at least: fine particles (1a) of silver or a silver alloy that are dispersed in the decorative coating; and a light-transmissive binder resin (1b) that binds the fine particles. In this decorative coating, in the CIE 1976 (L*, a*, b*) color space, a chromaticness index a* and a chromaticness index b* of the decorative coating satisfy a relationship of 6.7<=((a*)2+(b*)2)1 / 2<=23.4.

Description

technical field [0001] The present invention relates to a decorative coating provided on the surface of a resin substrate, particularly to a decorative coating having excellent gloss. Background of the invention [0002] In the related art, in a vehicle such as a motor vehicle, a radar device, such as a millimeter-wave radar, is installed in the center of the front of the vehicle to measure a distance to an obstacle in front of the vehicle or a distance to a vehicle in front. Electromagnetic waves from the radar unit, such as millimeter waves, are transmitted forward through the front grille and the vehicle manufacturer's logo and are reflected by objects such as vehicles ahead or obstacles ahead, and the reflected waves return to the radar unit through the front grille. [0003] Therefore, a material or a coating material that causes little radio wave transmission loss and can provide desired good appearance is preferable for the front grill portion, logo, etc. located on t...

Claims

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Application Information

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IPC IPC(8): C09D7/12C09D133/00C09D169/00C09D167/02C09D163/00C09D125/06
CPCC08K3/08C08K2003/0806C08K2003/0837C08K2003/0862C09D5/004C09D125/06C09D133/00C09D163/00C09D167/02C09D169/00
Inventor 吉永文隆
Owner TOYOTA JIDOSHA KK
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