| 摘要 |
<p>PROCESS FOR THE PURIFICATION OF POLYVINYL CHLORIDE Inventor: Martin L. Feldman, a citizen of the United States of America, residing at East Brunswick, County of Middlesex, State of New Jersey. The discoloration of polyvinyl chloride that usually occurs when a slurry containing this polymer is heated at a temperature above 70.degree.C. to reduce its monomer content to less than 10 ppm is minimized or prevented by carrying out the heating step in the presence of an oxidizing agent.</p> |
