Abstract: An unsymmetrical azo compound having the formula ##STR1## is provided wherein R" is an alkyl or aralkyl and R.sub.3 and R.sub.4 are hydrogen or aliphatic. The compound is useful as a vinyl polymerization initiator, a polyester resin curing agent and a blowing agent for foamed plastics.

Abstract: An unsymmetrical azo monomer contains t-alkyl, t-cycloalkyl, or t-aralkyl moiety and one polymerizable double bond. This compound is useful in polymerization and crosslinking systems.

Abstract: A method is provided for crosslinking polymers at temperatures above 170.degree. C using azo-esters having the formula ##STR1## wherein R.sup.3 is --OOC--R, alkyl, cycloalkyl or aralkyl.

Abstract: Compounds which contain azo or peroxide linkages as well as the radical of an ultraviolet light stabilizing group are described. These compounds function as polymerization initiators which cause an ultraviolet light stabilization group to be chemically bound to the polymer.

Abstract: I. Compounds having independent peroxidic (X) and aliphatic azo groups of the formula[(R-N.dbd.N-R').sub.m -X].sub.nExample: di-t-butylperoxy ester of cis-4,4'-azobis-(4-cyanovaleric acid).Ii. a method of making a block polymer where vinyl monomer is initiated sequentially to produce in one instance: a polymer having azo-carbon linkages present, which is then reacted with vinyl monomer under conditions to rupture the azo-carbon linkages, and in another instance: a polymer having peroxy-carbon linkages present, which is then reacted with vinyl monomer under conditions to rupture the peroxy carbon linkages.

Abstract: A new class of compounds: R-W-R' where R and R' are identical oxy radicals containing peroxide functions such as dialkyl or diaralkyl peroxide, peroxyketal, peroxyester, or monoperoxycarbonate, and W is a carbonyl group, or carbonyl containing group, or an alkylidene or aralkylidene group, or a phosphorus containing group.Examples:Di[1,3-dimethyl-3-(t-butylperoxy)butyl] carbonate;Di[1,3-dimethyl-3-(n-butoxycarbonylperoxy)butyl] carbonate;2,2-Bis[3,3-di(t-butylperoxy)butoxy] propane;Di[1,3-dimethyl-3-(t-butylperoxy)butyl] ethyl phosphate.They are free radical affording compounds useful in crosslinking of polyolefins and unsaturated polymers, and for the polymerization of vinyl monomers and diolefinic monomers.

Abstract: Compounds which contain azo or peroxide linkages as well as the radical of an ultraviolet light stabilizing group are described. These compounds function as polymerization initiators which cause an ultraviolet light stabilization group to be chemically bound to the polymer.

Abstract: Compounds which contain azo or peroxide linkages as well as the radical of an ultraviolet light stabilizing group are described. These compounds function as polymerization initiators which cause an ultraviolet light stabilization group to be chemically bound to the polymer.

Abstract: Compounds which contain azo or peroxide linkages as well as the radical of an ultraviolet light stabilizing group are described. These compounds function as polymerization initiators which cause an ultraviolet light stabilization group to be chemically bound to the polymer.

Abstract: Compounds which contain azo or peroxide linkages as well as the radical of an ultraviolet light stabilizing group are described. These compounds function as polymerization initiators which cause an ultraviolet light stabilization group to be chemically bound to the polymer.

Abstract: Compounds which contain azo linkages as well as the radical of an ultraviolet light stabilizing group are described. These compounds function as polymerization initiators which cause an ultraviolet light stabilization group to be chemically bound to the polymer.