Hollow particles
AssigneeZeon Corporation
InventorMasashi Watanabe
Life of this patent
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Abstract
Hollow particles which comprise a shell containing a resin and a hollow portion surrounded by the shell, wherein a void ratio is 50% or more; wherein a volume average particle diameter is 1.0 μm or more; wherein the shell contains, as the resin, a polymer in which 70 parts by mass to 100 parts by mass of a crosslinkable monomer unit is contained in 100 parts by mass of all monomer units; wherein a thermal expansion coefficient at 80° C. to 200° C. is 10.0×10−5/° C. or less; and wherein, in a hollow particle immersion test in which a mixture obtained by adding 0.1 mg of the hollow particles to 4 mL of acetone and shaking them for 10 minutes at a shaking rate of 100 rpm, is left to stand for 48 hours in an environment at 25° C., less than 10% by mass of the hollow particles submerge in the acetone.
Claims7
Hollow particles which comprise a shell containing a resin and a hollow portion surrounded by the shell,
- wherein a void ratio is 50% or more;
- wherein a volume average particle diameter is 1.0 μm or more;
- wherein the shell contains, as the resin, a polymer in which from 70 parts by mass to 98 parts by mass of a crosslinkable monomer unit is contained in 100 parts by mass of all monomer units;
- wherein the crosslinkable monomer unit comprises at least one selected from a bifunctional crosslinkable monomer unit derived from a bifunctional crosslinkable monomer and a trifunctional or higher-functional crosslinkable monomer unit derived from a trifunctional or higher-functional crosslinkable monomer;
- wherein the polymer contained in the shell further contains a hydrophilic non-crosslinkable monomer unit derived from a hydrophilic non-crosslinkable monomer having a solubility of 0.3 g/L or more in distilled water at 20° C., and a content of the hydrophilic non-crosslinkable monomer unit is from 2 parts by mass to 15 parts by mass in 100 parts by mass of all monomer units of the polymer,
- wherein a thermal expansion coefficient of the hollow particles at 80° C. to 200° C. is 10.0×10−5/° C. or less;
- and
- wherein, in a hollow particle immersion test in which a mixture obtained by adding 0.1 mg of the hollow particles to 4 mL of acetone and shaking them for 10 minutes at a shaking rate of 100 rpm, is left to stand for 48 hours in an environment at 25° C., less than 10% by mass of the hollow particles submerge in the acetone.
Dependencies are inferred from the claim text.