| 摘要 |
The present invention refers to a process for preparing cross-linked polyolefins, comprising the steps of adding a diazido compound of the formula (I) N-N-N-X-R-X-N-N=N wherein R represents an aryl, alkyl or aralkyl group having 3 to 20 carbon atoms and X stands for -CO-, -O-CO- -SO<SUB>2</SUB>-, -PO<SUB>2</SUB>-, -PO<SUB>3</SUB>-, or -Si (-O)-, and a peroxide compound of the general formula (II) R<SUB>1</SUB>-X<SUB>1</SUB>-OO-X<SUB>2</SUB>-R<SUB>2 </SUB>wherein R<SUB>1 </SUB>and R<SUB>2 </SUB>are the same or different and represent hydrogen, an aryl, alkyl or aralkyl group having 3 to 20 carbon atoms and optionally comprising further peroxide groups, wherein one of R<SUB>1 </SUB>and R<SUB>2 </SUB>can form a ring, and X<SUB>1 </SUB>and X<SUB>2 </SUB>are the same or different and stand for a direct bond, -CO<SUB>2</SUB>- or -CO- to a polyolefin in powder or pellet form; mixing the product to obtain a mixture; extruding the mixture in an extruder at a temperature above the decomposition temperature of the diazido compound of formula (I) and of the peroxide compound of formula (II). |
