Tack free surface cures of polymers by organic peroxides in the presence of air

A composition consisting essentially of crosslinking components useful for providing low compression set, surface tack free thermoset polymers by curing with free radical initiators in the presence of air, the components comprising:

• (a) At least one compound (A) having the formula (I):
• Wherein n is 1, R is divalent, or trivalent and is selected from the group consisting of cyclic aliphatic groups having from about 2 to 16 carbon atoms, cyclic aliphatic groups having from about 5 to 20 carbon atoms, aromatic groups having from about 6 to 18 carbon atoms and alkyl aromatic groups having from about 7 to 24 carbon atoms, and wherein the divalent, or trivalent groups may contain one or more heteroatoms selected from O, N and S, replacing a carbon atom, or carbon atoms and each R1 is identical and is hydrogen or an alkyl group of 1 to 18 carbon atoms;
• (b) At least one compound (B) selected from the group consisting of 4,4-dithiomorpholine, acyclicalkyl-2-benzothiazole sulfenamides, cyclicalkyl-2-benzothiazole sufenamides, aryl-2-benzothizole sulfenamides, alkylphenol disulfides and mixtures thereof;
• and
• (c) A free radical initiator (C) selected from the group consisting of organic peroxides and azo initiators.

A composition comprising

• a) at least one compound (A) having the formula (I):
• wherein n is 1, R is divalent or trivalent and is selected from the group consisting of cyclic aliphatic groups having from about 2 to 16 carbon atoms, cyclic aliphatic groups having from about 5 to 20 carbon atoms, aromatic groups having from about 6 to 18 carbon atoms and alkyl aromatic groups having about 7 to 24 carbon atoms, and wherein the divalent, or trivalent groups may contain one or more heteroatoms selected from O, N and S, replacing a carbon atom, or carbon atoms and each R1 is identical and is hydrogen or an alkyl group of 1 to 18 carbon atoms;
• and
• (b) At least one compound (B) selected from the group consisting of sulfur containing organic compounds capable of accelerating sulfur vulcanization of a polymer capable of being crosslinked by sulfur, polysulfide polymers and mixtures of said sulfur containing compounds,
• which composition is formulated as a masterbatch on a carrier selected from the group consisting of microcrystalline wax, polycaprolactone, EPMD, EPM, EVA, PE and mixtures thereof.

A composition consisting essentially of crosslinkable components useful for providing low compression set, surface tack free thermoset polymers by curing with free radical initiators in the presence of air, the components comprising:

• (a) At least one compound (A) having the formula (I):
• Wherein n is 1, R is divalent or trivalent and is selected form the group consisting of cyclic aliphatic groups having from about 5 to 20 carbon atoms, aromatic groups having from about 6 to 18 carbon atoms and alkyl aromatic groups having from about 7 to 24 carbon atoms, and wherein the divalent, or trivalent groups may contain one or more heteroatoms selected from O, N and S, replacing a carbon atom, or carbon atoms and each R1 is identical and is hydrogen or an alkyl group of 1 to 18 carbon atoms,
• (b) At least one compound (B) selected from the group consisting of sulfur containing organic compounds capable of accelerating sulfur vulcanization of a polymer capable of being crosslinked by sulfur, polysulfide polymers and mixtures of said sulfur containing compounds;
• and
• (c) A free radical initiator (C) selected from the group consisting of organic peroxides and azo initiators which composition is formulated as a masterbatch on a carrier selected from the group consisting of microcrystalline wax, polycaprolactone, EPDM, EPM, EVA, PE and mixtures thereof.