| 摘要 |
<p>A process for the free-radical polymerization of a vinyl monomer, including vinyl aromatic monomer, at least two distinct, progressively higher polymerization temperatures, each between the temperature of from about 50.degree.C and 130.degree.C, in the presence of at least minor proportions, is di-t-butyl diperoxycarbonate and the other, used in relatively major proportions, has a ten hour half-life temperature below 90.degree.C. The distinct temprature for polymerization may occur as separate parts of a polymerization in which the temperature of the system continually increases.</p> |
