Abstract:
Provided are: a method for producing particles by suspension polymerization, the method having exceptional monomer dispersion stability and also making it possible to simplify a cleaning step; composite particles that can be obtained by this production method; and the use of these composite particles. This method for producing composite particles includes a step for conducting the aqueous suspension polymerization of a monomer mixture containing a polymerizable vinyl monomer in the presence of small polymer particles having a volume-average particle size of 20-500 nm with water-soluble celluloses adsorbed to the surface, and obtaining composite particles that contain these small polymer particles and large polymer particles larger than these small polymer particles.
Abstract:
There are provided a method for producing particles by suspension polymerization which ensures an excellent dispersion stability of the monomer and a simpler washing step, composite particles obtainable by this production method, and use of the composite particles. The method for producing composite particles includes a polymerization step of subjecting a monomer mixture which contains a polymerizable vinyl monomer to aqueous suspension polymerization in a presence of small polymer particles having a volume-average particle size of 20 to 500 nm, with a water-soluble cellulose compound adsorbing on surfaces of the small polymer particles, and thereby obtaining composite particles which contain the small polymer particles and large polymer particles greater than the small polymer particles.
Abstract:
PROBLEM TO BE SOLVED: To provide a light diffusion film whose light diffusivity is improved. SOLUTION: The light diffusion film is provided with a light diffusion layer including acrylic resin particles having variation coefficient of 15% or less and resin binder on a transparent substrate, wherein the acrylic resin particles are formed of a monomer mixture containing a monofunctional acrylic monomer and a multifunctional acrylic monomer and composed of cross-linked acrylic resin particles A and cross-linked acrylic resin particles B, the cross-linked acrylic resin particles A are contained at the rate of 50 to 90 pts.wt. and the cross-linked acrylic resin particles B are contained at the rate of 50 to 10 pts.wt., to 100 pts.wt. of the cross-linked resin particles A and the cross-linked acrylic resin particles B in total, and the cross-linked acrylic resin particles A and the cross-linked acrylic resin particles B have the weight percent and average particle size of multifunction acrylic monomers in a specific range. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing non-spherical resin particles such as a biconvex lens form, etc., having the stable oil-absorbing amount of the obtained resin particles.SOLUTION: A method for producing non-spherical resin particles is provided by comprising a polymerization step of performing the aqueous suspension polymerization of a monomer mixture including a polymerizable vinyl monomer, and hydrophobic liquid state organic compound without having copolymerizability with the polymerizable vinyl monomer, a liquid state organic compound-removing step of removing the hydrophobic liquid state organic compound from the polymerization product obtained from the aqueous suspension polymerization, a drying step of drying the polymerization product removed with the hydrophobic organic compound, and a crushing step of crushing the dried polymerization product with an air flow impact type crushing to obtain the resin particles, and completing the removal of the hydrophobic liquid state organic compound within 24 hr after the completion of the aqueous suspension polymerization.
Abstract:
PROBLEM TO BE SOLVED: To provide expandable polystyrene resin particles being capable of giving an expanded molding proof against exudation of oils and coloring matters and being excellent in expandability, to provide a method for producing the same, to provide an expanded molding obtained therefrom, and to provide a packaged food prepared by packaging food in the expanded molding. SOLUTION: The expandable polystyrene resin particles are characterized in that an outer layer of a polystyrene resin formed by polymerizing a styrene monomer containing a crosslinkable monomer is formed on the surface of a polystyrene resin particle, an easily volatile blowing agent is infiltrated into the particles, the gel fraction of the polystyrene resin constituting the particles is 10 to 50 mass%, the ratio (Mw 1 /Mw 2 ) lies in the range of 0.5 to 0.8 (wherein Mw 1 is the weight-average molecular weight of the polystyrene resin extracted with tetrahydrofuran; and Mw 2 is the weight-average molecular weight of the polystyrene resin extracted after splitting each particle into two; and Mw 2 lies in the range of 150,000 to 400,000). COPYRIGHT: (C)2007,JPO&INPIT