Crosslinking of Polyolefins in the Presence of New s-Triazines

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Abstract
In the crosslinking of polyolefins (such as polyethylene, ethylene-propylene copolymers, and ethylene-(vinyl acetate) copolymers), multiply unsaturated s-triazines (such as triallylcyanurate (TAC), 2-alkylamino-4,6-diallyloxy-s-triazines, and the bridged 2-alkylenamino-4,6-diallyloxy-s-triazines) make it possible to decrease the concentration of the peroxide curing agent, or the radiation dosage, necessary to achieve adequate degrees of crosslinking. The multiply unsaturated alkyl(ene)-amino-s-triazines, most of which are novel compounds obtained by aminolysis of TAC, though similar to TAC in their effectiveness, provide better compatibility with the polymers and, accordingly, improved compound shelf life and processability. The 2-alkyl(ene)amino-4,6-diallyloxy-s-triazines or the bridged alkylamino-s-triazines present special advantages in peroxide crosslinking of filler-containing polyolefins. Especially when acidic fillers, such as calcined kaolin, are used in polyolefins, the addition of small amounts of alkylamino-s-triazine can induce an extraordinarily high degree of crosslinking in the polymers. Complete polymerization of the allyl groups under crosslinking conditions is desirable for optimum aging resistance of the crosslinked polyolefins. In the case of a polyethylene stabilized, for example, with an oligomerized trimethyldihydroquinoline, peroxide crosslinking in the presence of 2-alkyl(ene)amino-4,6-diallyloxy-s-triazines will bring about a further significant improvement in the stability to thermal oxidative degradation.

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