Method for producing transparent bead-like superabsorbent resin colored without color transfer and sustained-release preparation containing the same

摘要

PPROBLEM TO BE SOLVED: To provide a method for production of transparent bead-shaped high absorbing resin that is colored without color transference and provide a sustained-release preparation including the same. PSOLUTION: In the method for production of the high absorbing resin, a dispersing agent is dispersed in an organic solvent having specific gravity of 0.9 to 1.3, separately a hydrophilic monomer, a cross-linking agent, a polymerization initiator and a water-soluble thickener are used to prepare a monomer aqueous solution having viscosity of 5,000 to 30,000 cps. Simultaneously, a dispersion liquid of an oil-soluble pigments prepared in another vessel is added to the viscosity-increased monomer aqueous solution and further a lubricant is added so that coagulation may be inhibited to promote the polymerization. The resultant resin is a bead-shaped particle of the perfectly spherical form having an average particle size of 700 to 3,000 m with a narrow particle size distribution, retains the bead shape with the transparent color, even when the particles absorb water and swell, and the absorption power and the gel strength to the dye solution and the alcohol mixed solution are good, thus the bead-shaped high absorption resin having excellent aesthetic effect without mutual color transference. In addition, the sustained-release preparation can be produced using the high absorption resin as a main body. PCOPYRIGHT: (C)2007,JPO&INPIT