专利名称：Method of preparing polyvinyl alcohol gel发明人：Tomokazu Kobayashi,Toshio Morihiro申请号：US07/457942申请日：19891227公开号：US05141973A公开日：19920825
摘要：A method of preparing a polyvinyl alcohol hydrogel contains the steps ofcharging an aqueous solution of a polyvinyl alcohol having a degree of hydrolysis of notless than 95 mol % and an average polymerization degree of not less than 500 into acontainer, the aqueous solution containing the polyvinyl alcohol in a concentration of notless than 5 wt. %, cooling the aqueous solution of the polyvinyl alcohol at a temperatureof from - (minus) 9° C. to - (minus) 3° C., subjecting the aqueous solution of the polyvinylalcohol to physical stimulation, and then maintaining the aqueous solution of thepolyvinyl alcohol at a temperature of from - (minus) 5° C. to + (plus) 5° C. The polyvinylalcohol hydrogel may be contained in a plastic container. An MRI phanton is composed ofthe plastic container containing such polyvinyl alcohol hydrogel.
申请人：NIPPON OIL CO., LTD.
代理机构：Keil & Weinkauf
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