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Thermally-expandable microspheres having good foaming characteristics and uniform microsphere diameter and methods of preparing the same

A technology of heat-expandable microspheres and foaming agents, which is applied in the direction of microsphere preparation, microcapsule preparation, transportation and packaging, etc., and can solve problems such as productivity and yield limitations

Inactive Publication Date: 2011-05-25
CHEIL IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] However, this method requires specialized equipment and is limited in productivity and yield

Method used

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  • Thermally-expandable microspheres having good foaming characteristics and uniform microsphere diameter and methods of preparing the same
  • Thermally-expandable microspheres having good foaming characteristics and uniform microsphere diameter and methods of preparing the same
  • Thermally-expandable microspheres having good foaming characteristics and uniform microsphere diameter and methods of preparing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] By mixing about 120 parts by weight of acrylonitrile, about 24 parts by weight of methacrylonitrile, about 24 parts by weight of methyl methacrylate, about 72 parts by weight of ethyl acrylate, about 0.4 parts by weight of trimethylolpropane Trimethacrylate, about 1.2 parts by weight of polyethylene glycol diacrylate with a weight average molecular weight of about 2000, about 30 parts by weight of n-pentane and about 30 parts by weight of isopentane were used to prepare an emulsified mixture.

[0090] By mixing about 180 parts by weight of sodium chloride, about 54 parts by weight of colloidal silicon dioxide (Ludox-AM) with a solid content of 30%, about 0.8 parts by weight of polyvinylpyrrolidone, and about 0.02 parts by weight of sodium nitrite and about 665 parts by weight of ion-exchanged water to prepare an aqueous mixture. The aqueous dispersion was prepared by controlling the pH of the aqueous mixture to 3.0 by adding a 1 molar hydrochloric acid solution as a buf...

Embodiment 2-15 and comparative example 1-7

[0093] The preparation process was the same as that in Preparation Example 1 except that the components shown in Tables 1-3 were used.

[0094] Analysis of heat-expandable microspheres

[0095] Particle size distribution characteristics

[0096] The particle size distribution of the microspheres is measured by a particle size distribution laser diffraction analyzer LS 13320 produced by Bekman Coulter. The average diameter was measured as the volume average particle diameter, and the particle size distribution was calculated as C.V. value (standard deviation / average diameter) x 100%.

[0097] Foaming properties

[0098] The properties of the heat-expandable microspheres were measured by a thermomechanical analyzer TMA Q-400 produced by TA Instrument.

[0099] Samples were prepared from 1.0 mg of thermally expandable microspheres housed in an aluminum pan with a diameter of 6.7 mm and a depth of 4.5 mm. The aluminum pan was then sealed with an aluminum pan with a diame...

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Abstract

The present invention provides a thermally expandable microsphere having a core-shell structure comprising: a shell including a thermoplastic polymer and a long-chain crosslinking agent having a weight-average molecular weight between cross-linking sites of more than about 500; and a core including a foaming agent. The thermally expandable microsphere of the present invention can have excellent foaming characteristics and an even (uniform) microsphere diameter.

Description

[0001] References to related applications [0002] This application claims priority from Korean Patent Application No. 2009-114763 filed with the Korean Intellectual Property Office on Nov. 25, 2009, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The invention relates to a thermal expandable microsphere and a preparation method thereof. More specifically, the present invention relates to heat-expandable microspheres having a uniform microsphere diameter without reducing foaming characteristics, and a method for preparing the same. Background technique [0004] Heat-expandable microspheres have a core-shell structure. The shell is constructed of a thermoplastic polymer and has an inner foam core. If the temperature reaches the softening temperature of the thermoplastic polymer of the shell, the shell begins to soften. At the same time, the nuclear foam begins to expand due to the increase in foam vapor pressure. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/08C08F290/06C08F220/44C08F220/50C08F220/14C08F220/18C08F214/08C08F2/44C08J9/20
CPCB01J13/14Y10T428/2998C08J3/24C08J9/06C08J9/16
Inventor 白景贤田正培朱珽圭
Owner CHEIL IND INC