| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a methyl methacrylate polymer which has been modified in resistance to yellowing induced by exposing gamma radiation for sterilization in a medical field. <P>SOLUTION: The methyl methacrylate polymer has melt blended therein from 0.5 to 8% by weight, based on the weight of the polymer, of one polyalkylene glycol selected from the group consisting of a polyethylene glycol having a number average molecular weight in the range of from 2,000 to 10,000, a polypropylene glycol or a derivative thereof. The polyalkylene glycol is solid at ambient conditions. Further, the methyl methacrylate polymer has incorporated therein an impact modifier and 2,6-ditert.-butyl-p-cresol. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
