Heat-expandable microcapsules, process for producing the same, and method of utilizing the same
AssigneeMatsumoto Yushi-Seiyaku Co., Ltd.
InventorsToshiyuki Shimazawa, Ichiro Takahara
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Abstract
A heat-expandable microcapsule comprising a polymer shell formed by polymerizing (I) acrylonitrile, a main monomer component, (II) a monomer having carboxyl and (III) a monomer having groups reactive with the carboxyl of the monomer (II) and of a liquid having a boiling point lower than the softening point of the polymer and being encapsulated in the polymer shell. The heat-expandable microcapsules expand within high temperature range, 240° C. or above, and have heat-resistance.
Claims14
A heat-expandable microcapsule comprising a polymer shell produced by polymerizing essential components, (I) acrylonitrile, a main monomer component, (II) a monomer having carboxyl and (III) a monomer reactive with the carboxyl of said monomer (II), and in which a solvent having a boiling point lower than the softening point of the polymer is encapsulated.
A heat-expandable microcapsule comprising a polymer shell produced by polymerizing essential components, (I) acrylonitrile, a main monomer component, (II) a monomer having carboxyl, (III) a monomer reactive with the carboxyl of said monomer (II) and (IV) a monomer having two or more of polymerizing double bonds, and in which a solvent having a boiling point lower than the softening point of the polymer is encapsulated.
A heat-expandable microcapsule comprising a polymer shell produced by polymerizing essential components, (I) acrylonitrile, a main monomer component, (II) a monomer having carboxyl, (III) a monomer reactive with the carboxyl of said monomer (II) and (V) a monomer having high Tg functioning as a component for controlling softening point, and in which a solvent having a boiling point lower than the softening point of the polymer is encapsulated.
A heat-expandable microcapsule comprising a polymer shell produced by polymerizing essential components, (I) acrylonitrile, a main monomer component, (II) a monomer having carboxyl, (III) a monomer reactive with the carboxyl of said monomer (II), (IV) a monomer having two or more of polymerizing double bonds and (V) a monomer having high Tg functioning as a component for controlling softening point, and in which a solvent having a boiling point lower than the softening point of the polymer is encapsulated.
A production process of a heat-expandable microcapsule wherein an oil phase containing the above (I), (II), (III), (IV) and (V) is mixed and agitated in a water phase to be dispersed in the water phase and then polymerized.
Dependencies are inferred from the claim text.