Production method of irradiation crosslinked water-soluble polymer particles and radiation-crosslinked gelatin particles

摘要

Irradiation-crosslinked particles of a water-soluble polymer which are prepared by crosslinking droplets made of an aqueous solution of a water-soluble polymer by irradiation with a radiation, having the properties (a) to (e): (a) the crosslinked particles take the form of dry particles having substantially independent shapes in a dry state; (b) the mean particle diameter of the dry particles falls within the range of 0.5µm to 5mm; (c) the water content of the dry particles falls within the range of 50 to 99%; (d) when the dry particles are immersed in water at 37°C for 24 hours, the particles are not dissolved in water but can keep particulate shapes in a water-swollen state; and (e) when the color of the dry particles is determined according to the L*a*b* color specification system with a color difference meter, the particles exhibit a hue specified by an L*value of 90.00 or above and a b* value of 9.00 or below; and a process for the production of the crosslinked particles by irradiation with a radiation such as an electron beam or ? rays.