After the development research of degradable plastic, the study of pyrolysis on ordinary polyolefine especially polyethylene has become the mian direction of research.
在可降解塑料的开发研究以后，对普通聚烯烃类特别是聚乙烯的裂解研究已经成为人们研究的主要方向。
These catalyst systems are generally used to produce polyolefins having broad molecular weight distributions, especially polyethylene. Some systems are used to produce branched or block polymers.
大多数含茂金属的双组分或多组分催化体系用于制备宽分子量分布聚烯烃，尤其是宽分布聚乙烯，少数用于制备支化或嵌段聚合物。
The inventive method is especially suitable for granulating polyethylene or polypropylene.
本发明的方法特别适用于聚乙烯和聚丙烯的造粒。
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