Abstract: There is disclosed an improved process for cross-linking polymers by contacting said polymers with a cross-linking agent at an elevated temperature. The improvement comprises using as the cross-linking agent a compound of the formula ##STR1## wherein R.sub.1 and R.sub.2 are independently selected from the group consisting of alkyl groups having 1-22 carbon atoms, alkenyl groups having 2-22 carbon atoms, cyclohexyl groups having 6-20 carbon atoms, phenyl groups having 6-20 carbon atoms, aralkyl groups having 7-20 carbon atoms, alkyloxy groups having 1-22 carbon atoms, alkenyloxy groups having 2-22 carbon atoms, and cyclohexyloxy groups having 6-20 carbon atoms, all of which groups may be substituted or unsubstituted; R.sub.3 is selected from the group consisting of hydrogen, alkyl groups having 1-22 carbon atoms, alkenyl groups having 2-22 carbon atoms, cyclohexyl groups having 6-20 carbon atoms, phenyl groups having 6-20 carbon atoms, aralkyl groups having 7-20 carbon atoms, and ##STR2## wherein R.sub.

Abstract: This disclosure relates to an improved process for initiating radical reactions employing a class of hydroximic acid derivatives as initiators. Radical reactions initiated by such hydroximic acid derivatives include copolymerization of unsaturated polyester resins and cross-linking of polyethylene. The initiators of the present disclosure have a higher degradation temperature than found with typical peroxides.

Abstract: A process for the preparation of an organic peroxide master batch comprising about 20-60% by weight of an organic peroxide and about 40-80% by weight of a polymer capable of being cross-linked by the peroxide, is disclosed. The process comprises contacting particles of such a polymer, having a diameter from about 200 microns to about 20 millimeters, at a temperature from about 15.degree. C. to about 95.degree. C.

Abstract: A non-polar synthetic resin is mixed with an organic peroxide and cross-linked with a high frequency alternating current field. The peroxide is a perketal or perester of the formula 1, 1a, 2, 3, 4 or 5 of the drawing. The cross-linked resin is useful for the insulation of an electrical conductor.