Non-staining antioxidant

Method of synthesis solvent, monomer and catalyst (all high purity) are added to reactor, polymerization is stopped by addition of catalyst deactivator, and rubber protected by addition of a non-staining antioxidant ... 

Butylated reaction product of p-cresol and DCPD Physical Form Off-white powder or tan flakes An outstanding non-staining antioxidant. Highly active, low water solubility and virtually non-volatile giving long term protection under severe conditions. Extremely effective in latex compounds and due to its high activity can be used at low concentrations. 

A general purpose non-staining antioxidant particularly useful in stabilising SBR rubber. Affords good activity with moderate volatility characteristics. Isparts excellent resistauice to ultraviolet light discoloration. 

Vulkanox KB is a "non-discoloring antioxidant" and "non-staining antioxidant for light colored and transparent rubber goods based on natural and synthetic rubbers. Antioxidant properties can be improved in combination with Vulkanox MB-2 antioxidant. 

The amine antioxidants discussed above have the problem that they discolor the rubber products. They are not suitable for products intended to be light colored. With the development of synthetic rubber in the 1930s and 1940s, which was initially white from its polymerization reactors, it became even more desirable to develop non-staining antioxidants [ 1 ]. Substances such as hydroquinone, resorcinol, 1-naphtol, and 2-naphthol had been claimed as antioxidants early in the century [6, 7]. By the 1940s tris(nonyl phenyl)phosphite (Polygard )... 

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