Tri Phenyl Phosphite (TPP) is a clear liquid, used as a performance additive to improve the colour and clarity of alkyd resin, unsaturated polyester resin and various industrial oils during their manufacture.

The manufacture of various resins involves the use of high temperatures, usually in excess of 150° C. At these temperature the reaction mass tends to get coloured due to oxidation. Tri Phenyl Phosphite acts as an anti-oxidant and prevents colour formation of the finished product, as a result of which better quality resins are obtained.

It also finds application in polyurethane, hot melt adhesives, SBR rubber and in epoxies where it functions as a modifier.

TPP is also used in Pharmaceuticals. It is used in manufacture of Cephalosporin type drugs, in Di-Methyl Terephthalate (DMT) refining and as a colour reducing agent for Toluene di- isocyanate (TDI).

Tri ( Nonyl phenyl ) phosphite is a clear viscous hydrolytically stable liquid. It is used as an anti-oxidant for various types of polymers, especially in Non- toxic applications such as PVC bottles, Food wrapping, Sealing gaskets for food containers etc.

In combination with phenolic anti-oxidants it provides good synergism to the polymer.

It provides excellent protection against thermal degradation in polymers and rubbers. It is used in Nitrile, SBR and EPDM type of rubbers as a polymer stabilizer along with epoxidised oils.

The Alkyl Aryl Phosphites manufactured are

• Di phenyl iso decyl phosphite (DPDP)
  
• Di iso decyl phenyl phosphite (DDPP)
  
• Di phenyl iso octyl phosphite (DPOP)

These are clear, mobile liquids and are mainly used as Chelators in liquid PVC stabilizers.

These pure compounds improve colour retention during processing of polycarbonates, polyester and polyphenylene oxide.
They are also used as stabilizers in ABS, Polyurethane, Coatings and PET systems.