Process for extruding and cross-linking olefin polymers, diolefin polymers, and copolymers of olefins and diolefins and copolymerizable monomers
AssigneeAB Gustavsberg
InventorSven A. T. Bremholt
Life of this patent
Estimating the term…
Abstract
A process is provided for extruding and cross-linking olefin polymers, diolefin polymers and copolymers thereof with other olefins, diolefins, or monomers copolymerizable therewith, using as the cross-linking agent an azo compound of the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are alkyl having from one to about six carbon atoms. The process is of particular application in the production of cross-linked pipe of such polymers and copolymers.
Claims30
A process is provided for extruding and cross-linking in shaped form olefin polymers, diolefin polymers and copolymers thereof with other olefins, diolefins, or monomers copolymerizable therewith, which comprises extruding the polymer in shaped form in the presence as cross-linking agent of an azo compound of the formula:
- ##STR9## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are alkyl having from one to about six carbon atoms, and then heating the extruded polymer in shaped form at a temperature within the range from about 175.degree. C. to about 275.degree. C. to effect cross-linking reaction between the polymer and the azo compound.
Extruded pipe or tubing comprising a polymer selected from the group consisting of olefin polymers, diolefin polymers, and copolymers thereof with other olefins, diolefins, or monomers copolymerizable therewith, cross-linked with an azo compound of the formula:
- ##STR10## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 alkyl having from one to about six carbon atoms.
Dependencies are inferred from the claim text.