Elf Atochem North America, Inc.

Atofina Chemicals, Inc.

Elf Atochem N.a., Inc.

Michael Fred Novits

Chester J Kmiec

Edward Phillip Hibbard

Leonard Henry Palys

Luciano Abrigo

Fabien Debaud

Leo Kasehagen

Gary J Gullo

A crosslinkable composition of a polymeric thermoplastic and/or elastomeric material which is susceptible to scorching when processed at elevated temperatures, prior to crosslinking, in the presence of a free radical initiator, is protected against such scorching by the incorporation therein of a mixture of at least one hydroquinone compound and a sulfur accelerator. This mixture may also contain at least one monomeric allylic, methacrylic, acrylic or diene type coagent. The mixture exhibits a synergistic effect resulting in improved scorch protection for peroxide cured systems when compared with the protection afforded by the components singly.

Scorch extending curing/crosslinking compositions

Compositions are disclosed which comprise mixtures of at least one compound selected from silicone elastomers, bis-, tri- or higher polymaleimides and/or bis-, tri- or higher polycitraconimides, and at least one compound selected from p-phenylene-diamine based antiozonants, sulfur compounds capable of accelerating sulfur vulcanization of polymers capable of being crosslinked by sulfur and polysulfide polymers which when compounded into polymers curable by free radical initiators in the presence of free radical initiators permit substantially tack free surface cure of the polymers by decomposition of the free radical initiator in the presence of molecular oxygen. Compositions containing the above ingredients and at least one free radical initiator, curable compositions containing the combination and processes for making and using the compositions are also disclosed.

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

Sulfur free, crosslinking, scorch-retarding compositions for compounding and cure of polymers susceptible to cure by free radical initiators are disclosed.

Sulfur free, low color generating scorch time extending compositions for use in compounding and cure of free radical initiator curable polymers

Scorch retarded, crosslinkable compositions of peroxide or azo compound

Processes providing improved scorch retardation during compounding of

Scorch retarding crosslinking compositions comprising a hydroquinone, a

Process for the preparation of crosslinkable thermoplastic and/or

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Grand Island, NY, United States of America

Michael Fred Novits