Polymer particle coated with silica, method for producing the same and use of the same

A technology for polymer particles and coating, applied in the fields of polymer particles coated with silica gel and their preparation and use, can solve problems such as the limitation of available substances

Inactive Publication Date: 2006-03-08
SEKISUI PLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] In addition, since a mechanical shearing force is applied to the thermoplastic substance particles in the above-mentioned method, it is required that the thermoplastic substance particles used can withstand such shearing force, and there is a problem that usable substances are limited.

Method used

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  • Polymer particle coated with silica, method for producing the same and use of the same
  • Polymer particle coated with silica, method for producing the same and use of the same
  • Polymer particle coated with silica, method for producing the same and use of the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0172] 5 grams of magnesium pyrophosphate obtained by metathesis are mixed with 200 grams of water as a suspension stabilizer to obtain a dispersion medium, and the dispersion medium is added to a 500 milliliter separable flask, and 0.04 grams of sodium lauryl sulfate is used as a surfactant and 0.02 gram of sodium nitrate are dissolved in the dispersion medium as a polymerization inhibitor.

[0173] 70 g of methyl methacrylate as a monofunctional polymerizable vinyl monomer, 30 g of MKCsilicate MS57 (manufactured by Mitsubishi Chemical Co., Ltd.: average molecular weight 1300-1500, R in the aforementioned structure is methyl, n average 15-18) as a polyalkoxysiloxane oligomer and 0.25 g of 2,2'-azobis(2,4-dimethylvaleronitrile) as a polymerization initiator were uniformly dissolved to prepare a monomer composition .

[0174] The resulting monomer composition was added to the above dispersion medium, and stirred at 8000 rpm for 10 seconds with a homomixer (ULTRATURRAX T-25, ma...

Embodiment 2

[0177] According to the method same as embodiment 1, obtain the polymer particle that the surface of the polymer particle is exposed and be coated with silica gel, difference is that the amount of methyl methacrylate is changed into 30 grams, the amount of MKC silicate MS57 is changed into 70 grams, The amount of 2,2'-azobis(2,4-dimethylvaleronitrile) was changed to 0.15 g. The obtained silica gel-coated polymer particles had a volume average particle diameter of 116.3 µm, and the glass transition temperature of the polymer particles obtained from a polymerizable vinyl monomer was 105°C. The specular reflectance, aperture ratio, h / D and refractive index of the particles are shown in Table 1.

Embodiment 3

[0179] According to the same method as in Example 1, polymer particles coated with silica gel with the surface of the polymer particles exposed were obtained, except that MKC silicate MS 51 (manufactured by Mitsubishi Chemical Co., Ltd.: average molecular weight 500-700, aforementioned R in the structure is a methyl group, and the average n is 5-10) as a polyalkoxysiloxane oligomer. The obtained silica gel-coated polymer particles had a volume average particle diameter of 6.4 µm, and the glass transition temperature of the polymer particles obtained from a polymerizable vinyl monomer was 105°C. The specular reflectance, aperture ratio, h / D and refractive index of the particles are shown in Table 1.

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Abstract

A polymer particle coated with silica comprising: a polymer particle derived from a polymerizable vinyl-based monomer; and a silica film covering the polymer particle, which makes a surface of the polymer particle expose so that an aperture ratio of 0.1 to 1 is possessed and a height h of the silica film and a diameter D of the polymer particle coated with silica have a relationship of 0.5<=h / D<1, wherein the silica film includes a polyalkoxysiloxane oligomer condensate.

Description

technical field [0001] The present invention relates to polymer particles coated with silica gel, its preparation method and use. In more detail, the present invention relates to polymer particles coated with silica gel having good light scattering / reflecting properties, their preparation and use. The inventive silica gel-coated polymer particles are particularly suitable for use in coating compositions, coated bodies, optical elements, liquid crystal displays and light-scattering molded bodies. Background technique [0002] As a coating composition containing paint material components, a composition in which various particles are mixed to obtain various objects utilizing the light scattering properties possessed by these particles is generally used. For example, in order to obtain a matting surface of various molded bodies, a coating composition mixed with inorganic particles such as silica gel particles or organic polymer particles (resin particles) is generally used. Si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/44C08J3/12
Inventor 野口雄司
Owner SEKISUI PLASTICS CO LTD
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