申请人:EXXON CHEMICAL PATENTS INC.
公开号:EP0344021A2
公开(公告)日:1989-11-29
Copolymers which are the direct reaction product of isoolefin having from 4 to 7 carbon atoms and para-alkylstyrene and which have substantially homogeneous compositional distillation are disclosed. These copolymers are preferably copolymers of isobutylene and para-methylstyrene, and preferably at least about 95 wt. % of the copolymer has a para alkylstyrene content within about 10 wt. % of the average para-alkylstyrene content for the overall composition, and even more preferably the normalized differential refractive index and ultraviolet curves obtained by gel permeation chromatography for these copolymers are essentially superimposeable. These copolymers can also be halogenated, and in a particularly preferred aspect of the invention selectively brominated polymers are provided, with almost exclusive substitution taking place on the para-alkyl group, so as to yield a highly desirable benzylic halogen, and preferably bromine, functionality. Methods for producing these copolymers and halogenated copolymers are also disclosed.
本发明公开了由具有 4 至 7 个碳原子的异烯烃和对位烷基苯乙烯直接反应生成的共聚物,这些共聚物具有基本均匀的成分馏分。这些共聚物最好是异丁烯和对位甲基苯乙烯的共聚物,最好至少有约 95 重量%的共聚物的对位烷基苯乙烯含量在整个组合物的平均对位烷基苯乙烯含量的约 10 重量%范围内,更优选的是这些共聚物通过凝胶渗透色谱法获得的归一化微分折射率和紫外线曲线基本上是可叠加的。这些共聚物还可以卤化,本发明的一个特别优选方面是提供选择性溴化聚合物,几乎完全取代对位烷基,从而产生非常理想的苄基卤素官能团,最好是溴官能团。此外,还公开了生产这些共聚物和卤代共聚物的方法。