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Hollow polymer particle and manufacturing method thereof

A manufacturing method and polymer technology, which can be used in the preparation of microspheres, microcapsule preparations, temperature recording methods, etc., can solve the problems of low hollow particles and other problems, reduce the generation of concave particles, improve the thermal insulation effect, and make a leap in recording sensitivity Sex-enhancing effect

Active Publication Date: 2013-10-30
SANKO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Non-expanded hollow polymer particles may have problems such as a part or several depressions of the particle and become a concave particle with depression, forming a particle with a low hollow rate, etc.

Method used

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  • Hollow polymer particle and manufacturing method thereof
  • Hollow polymer particle and manufacturing method thereof
  • Hollow polymer particle and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] In a 1000 ml four-necked flask to which 201.2 g of deionized water was added, 0.6 g of a condensate of adipic acid and diethanolamine was dissolved as a dispersing aid, and 8.5 g of colloidal silica was added as a dispersing agent. The pH of this aqueous solution was adjusted to 3.0 with 4.5 g of 3% dilute sulfuric acid aqueous solution, and it was set as the aqueous phase.

[0077] 11.2 g of methyl methacrylate, 1.3 g of acrylonitrile as a polymerizable monomer, 12.5 g of trimethylolpropane trimethacrylate as a crosslinking agent, and 150.0 g of n-heptane as an organic solvent were mixed to form an oil phase.

[0078] Mix the water phase and the oil phase, and stir for 6 minutes with a T.K automatic homomixer M type (manufactured by Tokuki Kagaku Kogyo Co., Ltd.) at a speed of 12,000 rpm. After adjusting the particle size to 1 to 10 μm, add 2,2'-azo 0.1 g of bisisobutyronitrile was used as a polymerization initiator, nitrogen substitution was performed, and polymerizat...

Embodiment 2

[0086] As a diluent of the fine particle dispersion which contains n-heptane inside and the polymerization is completed, 385.0 g of warm water (85° C.) which has an azeotropic point of n-heptane and water, which is 79° C. or higher, is added. In the same manner, polymer microparticles with a high hollow ratio in a wet state were produced.

[0087] Maintaining the temperature of the dispersion from the start of the polymerization reaction to the vaporization and removal of the organic solvent has never been cooled, and performed the same operation as in Example 1 to vaporize and remove n-heptane contained in the microparticles, thereby obtaining Made of hollow particles in a wet state.

[0088] A magnified image obtained by photographing the obtained polymer particles with an electron microscope is shown in image 3 . by the image 3 It can be confirmed that the obtained polymer microparticles are different from the hollow polymer microparticles ( figure 1 ) compared with,...

Embodiment 3

[0093] The deionized water used when preparing the water phase was set to 586.2 g, and no diluent was used after emulsification dispersion and suspension polymerization. In addition, the same operation was carried out as in Example 2 to carry out the n-heptane contained in the microparticles. The gasification and removal, so as to obtain the particles made of hollow wet state.

[0094] It was confirmed that the number of depressed concave particles among the polymer particles decreased, and the number of hollow polymer particles with a high hollow ratio further increased, which was almost the same as in Example 2.

[0095] Table 1 shows the visual shape of the microparticles obtained in Example 3, and Table 2 shows the recording sensitivity of a thermosensitive recording medium using the microparticles as a heat insulating material.

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Abstract

Disclosed are a hollow polymer particle and a manufacturing method thereof. The invention provides a method for producing hollow polymer particles, capable of reducing generation of recessed particles low in hollow rate and increasing the particles high in hollow rate. The method is characterized in that, in water medium, a mixture of polymer monomers for forming housings of the polymer particles and organic solution is emulsified and scattered, the polymer monomers are floated and polymerized under the presence of a polymerization initiator to form polymer particles containing organic solution, and the organic solution in the polymer particles is gasified and removed through the housings of the particles so as to produce hollow polymer particles. In the method, the organic solution in the polymer particles is gasified and removed through the housings of the particles, when the polymer particles are scattered in the water medium, so as to produce hollow polymer particles.

Description

technical field [0001] The present invention relates to a method for producing hollow polymer particles capable of producing non-expanded hollow polymer particles with a high hollow ratio; and non-expanded hollow polymer particles with a high hollow ratio obtained by the production method. The hollow polymer microparticles of the present invention can be used, for example, as lightweight materials, materials for improving light-scattering properties, and materials used in intermediate layers formed between a support and a thermosensitive color-developing layer in order to improve the recording sensitivity of thermosensitive recording materials. Contains insulation materials, etc. The method for producing hollow polymer particles of the present invention is characterized in that it increases the production of non-expandable particles with a high hollow ratio, has good water dispersibility, is easy to prepare paint, does not scatter during handling, and is environmentally friend...

Claims

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Application Information

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IPC IPC(8): B01J13/14C08F222/14C08F220/14C08F220/44C08F2/18B41M5/44B41M5/30
CPCC08F2/18C08J3/00C08J3/12C08J9/00C08J9/28
Inventor 村田晃二小宫直城木原崇雄
Owner SANKO CO LTD
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