METHOD OF MODIFYING HYDROPHILIC POLYMER AND PROCESS FOR PRODUCING HYDROPHILIC POLYMER RESIN

摘要

Hydrophilic polymer is modified with a gaseous modifier or a powdered modifier made from a liquid modifier. To powder a liquid modifier, the liquid modifier is mixed with a water-insoluble compound, or the liquid modifier is cooled below its melting point to solidify it. With these methods it is possible to modify a hydrophilic polymer uniformly. When a gaseous modifier is used, the hydrophilic polymer and the modifier can be made to react efficiently and safely regardless of the size and shape of the hydrophilic polymer. When a hydrophilic polymer is modified with a powdered modifier, it is possible to uniformly mix a liquid modifier, virtually in a solid state, with a hydrophilic polymer and to easily control the timing of the modification.