Organic peroxide, crosslinking agent

Waritz RS Toxikology of organic peroxide crosslinking agents for elastomers... 

Lower Temperature Organic Peroxide Crosslinking Agents, Organic Peroxides, Atofina Chemicals, Inc., Philadelphia, Pa. 

The crosslinking of ethylene-propylene copolymer rubber (EPR) in the presence of organic peroxides has been investigated by Natta and/or his coworkers (1-3) and others (4,5). Co-agents such as sulfur (3,4) and unsaturated monomers (6), including maleic anhydride (MAH)(3,7) have been utilized in an effort to increase the crosslinking efficiency in the EPR-peroxide system. 

A breaker an enzyme (at T<140°F), strong oxidizing agent, or an acid, is used to depolymerize polysaccharides and break crosslinks such that viscosity declines at a controlled rate so that the proppant may be deposited in the fracture. Too rapid proppant dropout would cause a premature "sand-out" which prevents future extension of the fracture. Peroxydisulfates are the most frequently used breakers. Less reactive organic peroxides may be preferred for high temperature formations (85). 

The upper temperature limit for safe operation depends on the onset decomposition temperatures of peroxides and blowing agents employed. Preferred chemical crosslinking agents are organic peroxides, such as dicumyl peroxide (8). 

Cadox . [Akzo] Organic peroxide compds. initiator to curing polyester resins crosslinking agent to curing silicone rubbers. 

Classification Organic peroxide Properties M.w. 270.3 Uses Crosslinking agent Trade Name Synonyms Perkadox 20 t[Akzo Nobel http //www.akzonobei.com], Perkadox 20-W40 t[Akzo Nobel http //www. akzonobei. com]... 

A curing agent, such as an organic peroxide, may be added to the acrylic prepolymer mixture to enhance the crosslinking of the prepol miers and thus the subsequent solidification of the resulting polymer to form a matrix. 

Quickset, Organic peroxide catalyst, Witco Corp., Polymer Chemicals Group Quidur, Urethane prepolymer crosslinking agents, Merquinsa... 

Crosslinking agents Organic peroxides, coagents, rubber curatives... 

The addition of crosslinking agents such as organic peroxides to polyethylene has also provided a method to alter the polyethylene structure during the fabrication process in order to provide a material that improves ESCR for many applications. Crosslinked polyethylene is an excellent container for gasoline and has completely replaced the metal-based gasoline container that was common many years ago. 

The advantages and limitations of sulphur and peroxide vulcanisation are discussed. The Luperox range of organic peroxides produced by Elf Atochem and their applications in rubber vulcanisation and as crosslinking agents for polyolefins are reviewed. A number of commercial developments by the Company in this field are examined, and the activities of its plant in Gunzburg in Germany are described. 

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