Porous resin particles, method of manufacturing porous resin particles, and use of porous resin particles
AssigneeSekisui Plastics Co., Ltd.
InventorsYukio Hama, Koichiro Okamoto, Junko Hiroi
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Abstract
Disclosed are porous resin particles which contain a polymer of a monomer mixture containing, as monomers, at least a monofunctional (meth)acrylic acid ester and a crosslinking monomer. The monofunctional (meth)acrylic acid ester accounts for 1 wt % to 50 wt % of the monomer mixture, and the crosslinking monomer accounts for 50 wt % to 99 wt % of the monomer mixture. The porous resin particles have a specific surface area of 190 m2/g to 300 m2/g and a bulk specific gravity of 0.25 g/mL to 0.45 g/mL.
Claims22
Porous resin particles which comprise a polymer of a monomer mixture containing, as monomers, at least a monofunctional (meth)acrylic acid ester and a crosslinking monomer,
- the monofunctional (meth)acrylic acid ester accounting for 1 wt % to 50 wt % of the monomer mixture,
- the crosslinking monomer accounting for 50 wt % to 99 wt % of the monomer mixture, and
- the porous resin particles having a specific surface area of 190 m2/g to 300 m2/g and a bulk specific gravity of 0.25 g/mL to 0.45 g/mL.
Porous resin particles which have a specific surface area of 190 m2/g to 300 m2/g and such optical properties that the porous resin particles reflect, in a 0° direction with an intensity of 45 or greater, light that is incident thereto at an angle of −45°, where the porous resin particles specularly reflect, in a +45° direction with an intensity of 100, light that is incident thereto at an angle of −45.
A method of manufacturing porous resin particles which comprises:
- the polymerization step of suspension polymerizing a monomer mixture containing 1 wt % to 50 wt % monofunctional (meth)acrylic acid ester and 50 wt % to 99 wt % crosslinking monomer in an aqueous medium in the presence of an organic solvent to prepare a suspension containing porous resin particles;
- and
- the distillation step of distilling the suspension to remove the organic solvent from the suspension after the polymerization step,
- the organic solvent being used in 180, exclusive, to 450 parts by weight per 100 parts by weight of the monomer mixture in the polymerization step.
Dependencies are inferred from the claim text.