Process for preparing cross-linked polyolefins

Details Process for preparing cross-linked polyolefins Process for preparing cross-linked polyolefins

2006-06-06

2006-06-06

Choi, Ling-Sui (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S387000, C525S376000, C525S027000, C525S025000, C525S105000, C525S106000

Reexamination Certificate

active

07056987

ABSTRACT:
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— —SO2—, —PO2—, —PO3—, or —Si (═O)—, and a peroxide compound of the general formula (II) R1—X1—OO—X2—R2wherein R1and R2are 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 R1and R2can form a ring, and X1and X2are the same or different and stand for a direct bond, —CO2— 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).

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International Search Report for PCT/EP01/10082 mailed Jul. 17, 2002.
Hernandez et al., “Different curing systems for Ethylene-Propylene elastomer,” Rubber Chemistry and Technology 65(5): 869-878 (1992).

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