Abstract: A water-based ink comprising colored particles, which comprise a dye and a polymer having an acetal group.

Abstract: A polymer dispersion comprising water and polymer particles having a size of 5 to 500 nm in volume average diameter and having a core-part and a shell-part in each of the polymer particles, wherein the core-part and the shell-part each comprise a colorant and a polymer, and the shell-part contains the colorant in an amount of not more than 80 weight % of the colorant in the core-part.

Abstract: Uniform emulsions of fluorinated liquid droplets in water are formed from SPG (Shirasu porous glass) membrane emulsification. The fluorinated oil-in-water emulsions exhibit unusually stability, as the much denser fluorinated liquid droplets do not coalesce at least 3 month after emulsification. A subsequent polymerization of monomer mixtures of the fluorinated droplets yields uniform polymeric microspheres encapsulating the fluorinated fluid. The use of expanded PTFE membrane emulsification forms water-in-oil emulsions with uniform liquid droplets, especially when small amount of fluorinated liquid is present in the oil phase.

Abstract: A polymer dispersion comprising water and polymer particles having a size of 5 to 500 nm in volume average diameter and having a core-part and a shell-part in each of the polymer particles, wherein the core-part and the shell-part each comprise a colorant and a polymer, and the shell-part contains the colorant in an amount of not more than 80 weight % of the colorant in the core-part.

Abstract: A water-based ink comprising colored particles, which comprise a dye and a polymer having an acetal group.

Abstract: A continuous process for producing polymethyl methacrylate (PMMA) or its copolymer comprises precooling a monomeric feedstock consisting of methyl methacrylate (MMA) or a mixture of MMA and up to 10 mol % of a highly thermal radical-forming monomer, forcing the feedstock into a reactor wherein a preceding charge is being circulated under pressure, instantaneously mixing the whole charge and cooling it by dint of the sensible heat of the monomeric feedstock, while thoroughly mixing the hot radicals, thus effecting the polymerization within a short time period, continuously taking out from the reactor the polymerization product and unreacted monomer or monomers being circulatingly mixed, at a polymerization product proportion of 50% by weight or less, conducting the mixture, while preheating it, into a vacuum vessel, removing therein the remaining monomer or monomers by evaporation, and then recovering the polymerization product.