Фосфит бисфенола А

Description

Bisphenol A phosphite is an organophosphate compound based on bisphenol A, an intermediate product for the synthesis of phosphite antioxidants and polymer stabilizers. Such compounds are obtained by reacting aryl halophosphites with 4,4'-bisphenols and are further used as a building block in the production of more complex aryl di or tetraphosphites that protect polyolefins and other plastics from thermal oxidative destruction during processing.

Identification

• CAS No.: 4235-90-9
• Chemical formula: C15H17O4P
• English name: Bisphenol A Phosphite
• Synonym: Bisphenol A phosphite

Basic Attributes

• Molecular Weight: 292.266841
• Exact mass (according to the source): 766.32700 - a value higher than the molecular weight of the monomer unit and indicates an oligomeric or other form of registration in the database; the discrepancy is given as is, without calculation
• PSA specification: 195.66000
• XLogP3: 9.46130

Scope of application

It is used as an intermediate in the synthesis of phosphite antioxidants based on bisphenol A - auxiliary substances that are introduced into polymer compositions to increase thermal stability during extrusion, injection molding and other types of processing at elevated temperatures. Ready-made phosphite antioxidants on this basis are used in polypropylene, polyethylene and other thermoplastics along with phenolic antioxidants.

Chemistry of phosphite antioxidants

Phosphites work as secondary (peroxide-depleting) stabilizers: trivalent phosphorus reduces hydroperoxides of the polymer chain to alcohols, while oxidizing to the corresponding phosphate. This mechanism differs from the action of primary phenolic antioxidants, which break the oxidation chain reaction by reacting with peroxide radicals. In practice, phosphites and phenolic antioxidants are used together - the synergistic combination provides more complete protection of the polymer both at the stage of melt processing and during subsequent operation of the product.

Other data

Detailed information about melting points, boiling points, density, solubility and toxicological parameters for this particular compound was not found in open sources at the time of preparation of the description; The passport contains only the values ​​recorded in the original dump.

Storage and handling

Like most phosphite intermediates, it is sensitive to moisture and hydrolysis - the phosphite P–O bond tends to break down upon contact with water with the formation of phosphonic acids and bisphenol A. It is recommended to store it in an airtight container, in a dry place, away from water and strong oxidizing agents, with respiratory and skin protection when working with powder or melt. After opening, containers are recommended to be re-closed as quickly as possible to limit the absorption of atmospheric moisture.

Adjacent connections

The same product group of phosphite antioxidants based on bisphenols includes more well-known industrial products - tris(nonylphenyl)phosphite, tris(2,4-di-tert-butylphenyl)phosphite and bis-phosphites based on pentaerythritol. Bisphenol A phosphite acts as a simpler structural analogue and intermediate for the production of similar compounds in specialized chemical industries.