TRIPHENYL PHOSPHITE

PRODUCT IDENTIFICATION
CAS NO. 101-02-0

TRIPHENYL PHOSPHITE
EINECS NO. 202-908-4
FORMULA (C6H5O)3P
MOL WT. 310.29
H.S. CODE  
TOXICITY

 
SYNONYMS Phosphorous acid, triphenyl ester; TPP; P 36 stabilizer;
Triphenoxyphosphine; Triphenyl phosphite; Tris(phenoxy)phosphine;
DERIVATION  

CLASSIFICATION

 

PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATE clear to pale yellow oily liquid
MELTING POINT

22 - 25 C
BOILING POINT 360 C
SPECIFIC GRAVITY 1.175 - 1.185
SOLUBILITY IN WATER insoluble (slowly hydrolysed)
AUTOIGNITION  
NFPA RATINGS Health: 3; Flammability: 1; Instability: 0

REFRACTIVE INDEX

  
FLASH POINT 218 C
STABILITY Stable under normal temperatures and conditions

APPLICATIONS
Phosphorous acid  is a clear to yellowish crystalline solid with a garlic like odour melting at 73 C, decomposes at 200 C. It is very soluble in water and in alcohol. This compound contains one direct P-H bond (which is not very acidic) and only two hydrogens bonded to oxygen (which are acidic). The structure of this material is more correctly written (HO)2HPO. For this reason, this dibasic acid forms two series of salts, one containing the dihydrogen phosphite ion, H2PO3 - , and the other containing the hydrogen phosphite ion, HPO32-. It is prepared by hydrolysis of phosphorus trichloride (or tetraphosphorus hexaoxide) with alcohols or phenols. Phosphorous acid esters are called phosphite with the formula (RO)3P. Phosphorous acid and phosphite are used as reducing agents in chemical industry because of easy oxidation property to phosphoric acid. They are used as antioxidant, stabilizer and chelating agent in plastic system. They are used as solvent in paint and as flame retardant on fibres. They are used as a chemical intermediate in the production of pharmaceutical ingredients, pesticides, optical brighteners and in lubricant additives and adhesives. Tris(nonylphenyl) Phosphite is used as a heat stabilizer for polymers especially for unvulcanized rubbers and polyvinylchloride. It is a phenolic antioxidant maintain the performance integrity, color stability and processing stability of ABS, polycarbonate, polyolefins and vulcanized rubber.
SALES SPECIFICATION

APPEARANCE

 clear to pale yellowish oily liquid

PURITY

98.0% min

P CONTENT

10.0% min
SPECIFIC GRAVITY 1.175 ~ 1.185

REFRACTIVE INDEX

 1.5870 ~ 1.5900

ACID NUMBER

 0.5% max

COLOR

1 max (Gardner)

HEAT LOSS

0.5% max
TRANSPORTATION
PACKING 200kgs in drum
HAZARD CLASS  
UN NO.  
OTHER INFORMATION
Hazard Symbols: XI N, Risk Phrases: 36/38-50/53, Safety Phrases: 28-60-61
GENERAL DESCRIPTION OF ANTIOXIDANT
Antioxidant is a substance added in small quantities to hydrocarbons which are susceptible to oxidation, such as rubbers, plastics, foods, and oils to inhibit or slow oxidative processes, while being itself oxidized.  Antioxidants work in two different ways. In primary antioxidants (also called free-radical scavengers), antioxidative activity is implemented by the donation of an electron or hydrogen atom to a radical derivative. These antioxidants are usually hindered amines (p-Phenylene diamine, trimethyl dihydroquinolines, alkylated diphenyl amines) or substituted phenolic compounds with one or more bulky functional groups such as a tertiary butyl at 2,6 position commonly. Butylated hydroxytoluene (BHT) is a common example of hindered phenolic antioxidant. The reaction rate, or carbocation stability, in SN1 mechanism is 3° > 2° > 1° > CH3 (no SN1) so, tertiary alkyl moiety exists in lots of phenolic antioxidant compounds. Primary antioxidants are free radical scavengers which combine with peroxy radicals and break autocatalytic cycle. In secondary antioxidants ( also called peroxide decomposers), activity is implemented by the removal of an oxidative catalyst and the consequent prevention of the initiation of oxidation. Examples of peroxide decomposer type of antioxidant are trivalent phosphorous and divalent sulfurcontaining compound such as sulfides, thiodipropionates and organophosphites. Synergistic effect is expected when primary antioxidants are used together with secondary antioxidants as primary antioxidants are not very effective against the degradation by UV oxidation. Sometimes, chelating agents are added to scavenge metal impurities which can initiate decomposition.