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US 5,856,412 AGranted
Process for crosslinking thermoplastic polymers and crosslinking system used therein
AssigneeWitco Corporation
InventorsLawrence A. Bock, Roger N. Lewis
Life of this patent
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Abstract
A crosslinking system which includes a 1,2,4-trioxacycloheptane and a crosslink-promoting polyfunctional ethylenically unsaturated compound. This system is employed in a process of crosslinking a thermoplastic polymer. Preferred polymers, useful in this process, include ethylene homopolymers and copolymers.
Claims24
A crosslinking system comprising:
- (a) a 1,2,4-trioxacycloheptane having the structural formula ##STR6## where R.sup.1 and R.sup.2 are the same or different and are hydrogen, C.sub.1 -C.sub.12 alkyl, phenyl, alkyl-substituted phenyl, aralkyl or together form a substituted or unsubstituted cycloalkyl or heterocyclic oxygen-containing ring with the proviso that both R.sup.1 and R.sup.2 cannot both be hydrogen and that if R.sup.1 is methyl, R.sup.2 can be ##STR7## (b) a crosslink-promoting polyfunctional ethylenically unsaturated compound.
A process of crosslinking a polymer which comprises contacting a thermoplastic polymer with a crosslinking system which includes
- (a) a 1,2,4-trioxacycloheptane having the structural formula ##STR10## where R.sup.1 and R.sup.2 are the same or different and are hydrogen, C.sub.1 -C.sub.12 alkyl, phenyl, alkyl-substituted phenyl, aralkyl or together form a substituted or unsubstituted cycloalkyl or heterocyclic oxygen-containing ring with the provisos that both R.sup.1 and R.sup.2 cannot both be hydrogen and that when R.sup.1 is methyl, R.sup.2 may be ##STR11## and (b) a crosslink-promoting polyfunctional ethylenically unsaturated compound.
Dependencies are inferred from the claim text.