Polymer particles, process for production thereof, resin compositions containing the particles, and moldings

A technology of resin composition and polymer, which is applied in the direction of diffusion elements, etc., can solve the problems of large polymer particle constraints and difficulty in quality adjustment, and achieve the effects of less structural constraints, less powder flying, and excellent powder properties

Inactive Publication Date: 2008-12-24
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, when using this method, it is difficult to adjust the quality due to the large structural constraints of the polymer particles, and there is a problem that it can only be applied to specific fields.
In addition, in this method, it is not described whether it is possible to granulate to a size of 1000 μm or more

Method used

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  • Polymer particles, process for production thereof, resin compositions containing the particles, and moldings
  • Polymer particles, process for production thereof, resin compositions containing the particles, and moldings
  • Polymer particles, process for production thereof, resin compositions containing the particles, and moldings

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0084] (Method for producing polymer microparticles (A))

[0085] As a method of polymerizing the above-mentioned polymer microparticles (A), it is preferable to first prepare a suspending and dispersing agent containing a polymerizable monomer, a water-insoluble substance, an oil-soluble polymerization initiator, an emulsifier, and / or a water-soluble polymer compound, and water. The mixed liquid, then, apply mechanical shear to the mixed liquid to prepare O / W type emulsion, then, after introducing the O / W type emulsion thus prepared into the polymerization device, further make the O / W type emulsion under the condition of rising temperature The method to perform the aggregation.

[0086] When preparing this emulsion, in order to control the particle size of the O / W type emulsion, it is preferable to use a dispersing device that can adjust the shear strength, and to carry out while adjusting the strength. In addition, it is more preferable to carry out cooling operation at the ...

Embodiment

[0220] Hereinafter, specific examples are given and described, but these are examples and do not limit the content of the present invention at all.

[0221] (various measurement methods)

[0222] First, various measurement methods described below will be described.

[0223] The measurement of the volume average particle size and the amount of fine powder below 50 μm is based on the measurement method specified in JIS Z8901, by observing with a micro-track particle size analyzer Model 9220FRA (manufactured by Nikkiso Co., Ltd.) or an optical microscope, and randomly selected 100 Particle image analysis is carried out.

[0224] In addition, the degree of turbidity of the filtrate after polymerization of the matting polymer particles (C) was confirmed by observing the filtrate of the slurry obtained by filtration using qualitative filter paper No. 2 manufactured by Advantech Toyo Co., Ltd.

[0225] The light transmittance was evaluated by measuring the total light transmittance...

preparation example 1

[0249]

[0250] The methyl methacrylate-butyl acrylate copolymer (MB) used in Examples 16 and 17, and Comparative Examples 9 and 10 was prepared by the following method.

[0251] That is, after adding 220 parts by weight of water and 15 parts by weight of a 3% by weight aqueous solution of polyvinyl alcohol (GH-20: manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) to a reactor equipped with a stirrer, the inside of the reactor was replaced with nitrogen gas. . Added therein containing 90 parts by weight of methyl methacrylate dissolved with 0.5 parts by weight of lauroyl peroxide and 0.5 parts by weight of benzoyl peroxide, 10 parts by weight of butyl acrylate and 0.8 parts by weight of tertiary dodecyl mercaptan For the monomer mixture, adjust the rotation speed of the mixer so that the dispersed particle size of the monomer is about 250 μm. Then, the polymerization was completed by heating at 60° C. for 2 hours, 70° C. for 2 hours, 80° C. for 2 hours, and 90° ...

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Abstract

A process for the production of polymer particles having excellent powder characteristics which involves little structural restriction of the starting polymer fine particles; matte or light-diffusing resin compositions which contain the polymer particles and which are excellent in physical properties and handleability; and moldings of the compositions. The resin compositions are characterized by comprising polymer particles (C) which are obtained by mixing a latex of polymer fine particles (A) having a volume-mean particle diameter of 1 to 50[mu]m with a polymerizable monomer (B), a polymerization initiator, a suspending dispersant, and a coagulant and subjecting the obtained mixture to granulation and suspension polymerization and which have a volume-mean particle diameter of 100 to 6000[mu]m and a content of fine powder of 50[mu]m or smaller of 15 percent by weight or below and at least one base resin (D) selected from the group consisting of thermoplastic resins, thermosetting resins, and elastomers.

Description

technical field [0001] The present invention relates to polymer particles, a method for preparing the same, a resin composition and a molded article containing the polymer particles. Background technique [0002] In recent years, fine particles having a particle diameter of approximately 1 to 50 μm have attracted attention in many fields, and are also required for various applications. Examples include resin modifiers, light diffusing agents or matting agents in the field of paints and various displays, smoothness imparting agents in the field of cosmetics, and development of materials for toners in the field of electronic copiers. It is expected that the application of such micron-order particles will expand in the future. [0003] For example, a light diffusing agent refers to inorganic or organic fine particles dispersed in a transparent resin having a refractive index different from that of the transparent resin in order to obtain light diffusing properties in projectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/44C08L101/00C08F291/00G02B5/02C08L51/00
Inventor 北山史延菅谷刚彦
Owner KANEKA CORP
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