Phosphite Antioxidants

Phosphite Antioxidants

Phosphite antioxidants function by decomposing peroxides and provide protection to adhesives, plastics, and coatings during high temperature processing but do not provide long term thermal stability.  Combinations with phenolic antioxidants often show synergistic performance and are widely used.


Benefos® 1618

Overview

Benefos 1618 is a phosphite-type antioxidant for the stabilization of a wide range of plastics, elastomers, adhesives, and other substrates.

Chemistry

Chemical Name:                     2,4,8,10-Tetraoxa-3,9-diphosphaspiro[5.5]undecane, 3,9-bis(octadecyloxy)

CAS Number:                         3806-34-6

Chemical Structure:

Benefos 1618

Typical Properties         

Product Form:                         Solid

Melting Point:                          50 – 65oC

Molecular Weight:                   732 g/mol

Applications

Benefos 1618 is is particularly useful to prevent the discoloration of polymers during melt processing operations, including polyolefins, polyesters, styrenic polymers, engineering plastics, elastomers, and adhesives. It also contributes to the UV stability of polyolefins.

Advantages

  • Highly effective to prevent discoloration of polymers during extrusion and molding operations
  • High performance at low loading levels
  • Reduces discoloration in polymers containing pigments such as titanium dioxide
  • Enhances the light stability of polyolefins when used with light stabilizers
  • Non-discoloring and low volatility
  • FDA cleared for use in olefin polymers, EVA, and polystyrene

Guidelines for Use

The recommended loading levels range between 0.05 and 0.5% depending on the substrate, processing conditions, and other performance requirements. Best results in terms of processing and thermal oxidative stability are generally obtained by combining Benefos 1618 with conventional phenolic antioxidants (BNX 1010, BNX 1076, and others). Benefos 1618 is also suitable for use in combination with other antioxidants (for example thioethers) and light stabilizers, including hindered amine light stabilizers (HALS), UV absorbers, and benzoates. The exact formulation to be used is dependent on the substrate, performance requirements, and other factors, and should be determined by the user based on testing to simulate actual conditions of use. Please contact Mayzo for specific recommendations.

Storage

This product may be stored up to two years in a sealed container. Containers should be kept tightly closed when not in use and stored in a cool, dry place. This product is moisture sensitive. Guard against exposure to humidity or moisture to maintain product quality. Opened containers should be used as soon as possible to avoid hydrolysis, especially during humid weather.

Safety

Please consult the Safety Data Sheet (SDS) prior to handling or using this product.

FDA Regulations

Benefos 1618 is FDA cleared under 21 CFR §178.2010, including in olefin polymers, ethylene-vinyl acetate copolymers, and polystyrene (including rubber-modified polystyrene). Please contact your Mayzo representative for complete details, including restrictions of use.

Additional Product Details: Please view our Benefos 1618 PDF

Benefos 1626

Overview

Benefos 1626 is a phosphite type antioxidant of high phosphorous content.  This secondary antioxidant provides excellent heat stability and reduction in polymer degradation during processing.  Benefos 1626 has good synergism when used with light stabilizers such as benzophenones and benzotriazoles.

Chemistry

Chemical Name:                     Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite

CAS Number:                         26741-53-7

Chemical Structure:

Benefos 1626

Typical Properties         

Product Form:                         Solid

Melting Point:                          170 – 180oC

Molecular Weight:                   605 g/mol

Applications 

Benefos 1626 is a highly effective processing stabilizer in polyolefins, including polyethylene polypropylene, as well as in olefin copolymers such as EVA. It is also recommended for use in other substrates such as PVC, engineering plastics, polyurethanes, styrenic polymers, elastomers, and adhesives.

Advantages

  • Extends performance of primary antioxidants (i.e. BNX 1010 or BNX 1076)
  • Protects polymers from chain scission and cross-linking during melt processing
  • Prevents discoloration of polymers during melt processing
  • Improved long-term thermal stability
  • Synergism when used with light stabilizers such as benzophenones and benzotriazoles
  • FDA cleared for use in polyolefins, PVC, and polycarbonate

Guidelines for Use

Recommended loading concentrations range between 0.02% and 0.2% in polyolefins and between 0.05% and 0.25% in other substrates. Combinations of Benefos 1626 with phenolic primary antioxidants (BNX 1010, BNX 1076, and others) often show synergistic performance. Benefos 1626 is also suitable for use in combination with other antioxidants (for example thioethers) and light stabilizers, including hindered amine light stabilizers (HALS), UV absorbers, and benzoates. The exact formulation to be used is dependent on the substrate, performance requirements, and other factors, and should be determined by the user based on testing to simulate actual conditions of use. Please contact Mayzo for specific recommendations.

Storage

This product may be stored up to two years in a sealed container. Containers should be kept tightly closed when not in use and stored in a cool, dry place. This product is moisture sensitive. Guard against exposure to humidity or moisture to maintain product quality. Opened containers should be used as soon as possible to avoid hydrolysis, especially during humid weather.

Safety

Please consult the Safety Data Sheet (SDS) prior to handling or using this product.

FDA Regulations

Benefos 1626 is FDA cleared under 21 CFR §178.2010, including in olefin polymers, polyvinyl chloride and vinyl chloride copolymers, and polycarbonate resins. Please contact your Mayzo representative for complete details, including restrictions of use.

Additional Product Details: Please view our Benefos 1626 PDF

Benefos 1680

Overview
Benefos 1680 is a phosphite type antioxidant of low volatility and extremely resistant to hydrolysis.  This secondary antioxidant provides excellent heat stability and antioxidation, with good compatibility with resins and excellent extraction resistance.  Benefos 1680 performs best when combined with a primary antioxidant (i.e. BNX 1010 or BNX 1076).

Chemistry

Chemical Name: Tris(2, 4-di-tert-butylphenyl)phosphite

CAS Number:   31570-04-4

Chemical Structure:

Benefos 1680

Typical Properties

Product Form:   Solid

Melting Point:   183 – 187oC

Molecular Weight:   647 g/mol

Product Details: Please view our Benefos 1680 PDF