申请人:Pennwalt Corporation
公开号:US04130700A1
公开(公告)日:1978-12-19
A process for the free-radical polymerization of vinyl monomers, including vinyl aromatic monomers, at at least two distinct progressively higher polymerization temperatures, each between the temperatures of about 70.degree. C to about 150.degree. C in the presence of at least two free-radical initiators, one of which initiators, used in relatively minor proportions, has the formula ##STR1## wherein x is a numeral from 1 to 5 inclusive, B is ##STR2## A is hydrocarbyl, A, is tertiary hydrocarbyl and R is A, a hydrocarbyloxy or alkylperoxy and the other initiator, used in relatively major proportions, has a 10 hour half-life temperature below about 100.degree. C. The distinct temperatures for polymerization may occur as separate parts of a polymerization in which the temperature of the system continually increases.
一种自由基聚合乙烯单体的方法,包括乙烯芳香族单体,在至少两个不同的逐渐升高的聚合温度下进行聚合,每个温度在约70°C到约150°C之间,在至少两种自由基引发剂的存在下进行,其中一种引发剂在相对较小的比例下使用,其公式为##STR1## 其中x为1至5的数字,B为##STR2## A为烃基,A,为三级烃基,R为A,羟基烃氧基或烷基过氧化物,另一种引发剂在相对较大的比例下使用,其10小时半衰期温度低于约100°C。聚合的不同温度可以作为聚合的分离部分发生,其中系统的温度不断升高。