Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Reexamination Certificate
2006-03-01
2010-06-22
Gulakowski, Randy (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
C521S059000, C521S142000, C521S143000, C521S149000, C521S150000
Reexamination Certificate
active
07741378
ABSTRACT:
To provide porous monodispersed particles obtained by preparing, as seed particles, poly(methyl methacrylate) particles or acrylic resin particles comprising 70% by mass or more of methyl methacrylate as a copolymerization component, swelling the seed particles 20 to 80 times the size of the original seed particles by mass using a swelling solution comprising an oil-soluble polymerization initiator and a monomer mixture containing 70% by mass or more of methyl methacrylate and 3 to 8% by mass of divinylbenzene, and polymerizing the monomers. The particles are porous particles with a diameter of the order of micrometers and a narrow particle-size distribution and are monodispersed. Colored monodispersed particles obtained by agglomerating a pigment in the porous monodispersed particles are monodispersed and spherical, and contain a large amount of pigment therein.
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Gulakowski Randy
Negrelli Kara
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Soken Chemical & Engineering Co., Ltd.
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