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AssigneeToyo Boseki Kabushiki Kaisha
InventorsYasunari Hotta, Satoshi Maeda, Yozo Yamada, Shinichiro Mori, Toshio Tanaka, Koji Tanaka, Hiroshi Ono
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Spherical resin particles having a sharp particle size distribution and a method for producing such particles are disclosed. Resin particles according to this invention contain at least a polyester polymer and a polymer formed from a polymerizable monomer, and have an average diameter (D) of 1 to 500 .mu.m. At least 70% by weight of the particles have a diameter in the range of 0.5 D to 2.0 D. Such resin particles can be produced by swelling polyester-containing seed particles with a polymerizable monomer and then polymerizing the polymerizable monomer in swelled seed particles.
Resin particles which comprise at least a polymer of a polymerizable monomer comprising one or more of a vinyl monomer and a ring-opening polymerizable monomer and a polyester polymer, wherein the average particle diameter (D) of said particles is 1 to 500 .mu.m and
Dependencies are inferred from the claim text.