Process for crosslinking

DETAILED DESCRIPTION We claim: 1.
A process for crosslinking comprising (a) introducing into a reactor, under crosslinking conditions, a mixture comprising (i) one or more polyolefins; (ii) organic peroxide; (iii) an ester, ether or ketone containing two or more unsaturated groups; and (iv) a compound having the formula: ##STR5## wherein R=hydrogen, methyl, or ethyl; R.
sup.
1 =an alkylene having 1 to 6 carbon atoms; and R.
sup.
2 =an alkyl having 8 or more carbon atoms or Si(R.
sup.
3).
sub.
3 wherein R.
sup.
3 is hydrogen or alkoxy having 1 to 6 carbon atoms; each R.
sup.
3 is the same or different; and at least one R.
sup.
3 is an alkoxy, and (b) crosslinking the polyolefin(s).
2.
The process defined in claim 1 wherein the polyolefin is a polyethylene .
3.
The process defined in claim 1 wherein the organic peroxide is dicumyl peroxide.
4.
The process defined in claim 1 wherein component (iii) is triallyl cyanurate.
5.
The process defined in claim 1 wherein component (iv) is lauryl methacrylate.
6.
The process defined in claim 1 wherein for each 100 parts by weight of polyolefin, the proportions are about as follows:
______________________________________
Component Parts by Weight
______________________________________
(ii) 0.
2 to 2.
0
(iii) 0.
1 to 1.
8
(iv) 0.
1 to 2.
0
______________________________________
7.
A process for extrusion comprising (a) introducing into an extruder a mixture of (i) VLDPE, and, for each 100 parts by weight of VLDPE, the following components in about the following proportions:
______________________________________
Component Parts by Weight
______________________________________
(ii) dicumyl peroxide
0.
2 to 2.
0
(iii) triallyl cyanurate
0.
1 to 1.
8
or triallyl isocyanurate
(iv) lauryl methacrylate
0.
1 to 2.
0
______________________________________
(b) extruding the mixture at a temperature in the range of about 130