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BASF

BASF Antioxidant

Additives are used in a wide range of applications in the world of plastic industry. lndeed, modern technologies and everyday life would not be the same without the many excellent properties of plastics and that can only be achieved by using additives.

Antioxidants to prevent Polymer Oxidation

Antioxidants to prevent Polymer Oxidation

Why should antioxidants be used?

Virtually all polymeric materials undergo oxidation reactions. Oxidation can occur at every stage of the life cycle of a polymer, i.e. during manufacturing and storage of the material or during processing and end-use. Typical manifestations of oxidation of polymers can be change of viscosity during processing, appearance and loss of mechanical properties such as elongation, impact strength, tensile strength and flexibility. Antioxidants protect polymers against oxidation by controlling molecular weight changes that lead to a loss of physical, mechanical and optical properties.

2.1 Mechanisms

> Oxidation

Organic materials react with molecular oxygen in a process called "autoxidation". Autoxidation is initiated by heat, light (high energy radiation), mechanical stress, catalyst residues, or reaction with impurities to form alkyl radicals. The free radical can, in turn, react and result in the degradation of the polymer. This is depicted below:

Oxidation

> lnhibited Polyolefin Oxidation

Antioxidants interrupt the degradation processes in different ways, depending on their structure. The two major classifications are: - chain terminating primary antioxidants and - hydroperoxide decomposing secondary antioxidants.

Stabilization


> Primary Antioxidants

Primary antioxidants react rapidly with peroxy and alkoxy radicals and are, therefore, called "Radical Scavengers". The majority of primary antioxidants for polymers are sterically hindered phenols. Irganox® 1010, Irganox® 1076, Irganox® 1098, Irganox® 1330, Irganox® 1425 WL, Irganox® 3114, Irganox® 245 and Irganox® 1135 are primary antioxidants. Irganox 200x
Irganox® 1010, magnified 200x
Secondary aromatic amines are primary antioxidants mainly used in carbon-black filled rubbers and some polyurethane applications. The high discoloration of the polymer and the lack of indirect food contact approvals prohibits the use in larger applications such packaging materials. Irganox® 5057 is secondary aromatic amine for polyol and rubber stabilization.

> Secondary Antioxidants

Secondary antioxidants react with hydroperoxides to yield non-radical products and are, therefore, frequently called hydroperoxide decomposers. Secondary antioxidants are particularly useful in synergistic combinations with primary antioxidants. Blends of stabilizers with different mechanisms are state-of the-art today. Examples of typical blends are Irganox® B 215, Irganox® B 225, Irganox® B 561 and Irganox® B 900. I-168
Irganox® 168, magnified 400x
Phosphites are most effective during processing and protect both the polymer and the primary antioxidant. Hydrolytically stable phosphites are the most frequently used processing stabilizers in high-performance additive systems.

Thioethers are useful only in increasing the long-term thermal stability in conjunction with phenolic antioxidants. The use of thioethers is limited to areas where their possible effect on odor or taste and their negative interaction with HALS is not important.
Irgafos® 168, Irgafos® 126, Irganox® PS 800 and Irganox® PS 802 are secondary antioxidants.

> Alkyl radical scavengers

A third class of antioxidants are the alkyl radical scavengers. Scavenging the alkyl radicals immediately stops the oxidation. However, the extremely high reaction rate of oxygen with alkyl radicals limits the use of alkyl radical scavenger to oxygen deficient conditions, such as extrusion. Irganox® E 201 and the blend Irgastab® FS 301 belong to this class.

> Multifunctional stabilizers

In multifunctional stabilizers, several functions are combined in the same molecule: the most widely used combination are sterically hindered phenols with sulfur substituents or sterically hindered phenols with copper chelating function (metal deactivators). Irganox® 1035, Irganox® 565, Irganox® 1520 L, Irganox® MD 1024 are example of multifunctional additives.

Polymer molecules undergo different reactions during degradation, leading to structural changes. Bond scission in the polymer background and crosslinking reactions will result in changes in average molecular weight and molecular weight distribution of the polymer chain. The chemical pathway of degradation and the manifestation of the aging are unique for a specific polymer and defined conditions. Test methods and failure criteria are therefore varying for different polymers and applications. Typically, a polymer property related to the structural changes of the polymer molecules is monitored during a thermal or thermomechanical aging.

Selection guides
Find the suitable antioxidants for your polymer and application
Antioxidants for Styrenics / Antioxidants for Polyamid / Antioxidants for Polyesters /...

Synergies between Antioxidants and Light Stabilizers

OIT- Assessment of oxidative stability of polymeric material

Downloads

Product Datasheets

Irgastab® IS 6113L

Irgastab® IS 6113L by BASF is a multifunctional liquid antioxidant blend for processing and long-term thermal stabilization. It is suitable for the stabilization of elastomers including BR (butadiene rubber), SBR (styrene butadiene rubber), NBR (nitrile butadiene rubber) and rubber latex. This addit...

Irgastab® IS 4266 L

Irgastab® IS 4266 L by BASF is an aqueous dispersion of low volatile and non-discoloring antioxidants. It acts as a processing stabilizer and provides excellent protection against thermo-oxidative degradation of MBS. It is also suitable for the stabilization of thermoplastic styrene copolymers. It c...

Irgastab® IS 6300L(EB)

Irgastab® IS 6300L(EB) by BASF is an aqueous dispersion of processing and long-term thermal stabilizer designed for NR-latex, NB-latex and related emulsion polymerization type of polymers. It exhibits excellent polymer color performance and improved long-term heat- and storage stability. The low vol...

Irganox® 1010

Irganox® 1010 by BASF is pentaerythritol tetrakis[3-[3,5-di-tert-butyl-4-hydroxyphenyl]propionate. It is an odorless and tasteless, sterically hindered phenolic primary antioxidant. It is a highly effective, non-discoloring, long-term stabilizer which protects organic substrates such as plastics, sy...

Irganox® 1076

Irganox® 1076 by BASF is octadecyl-3-[3,5-di-tert-butyl-4-hydroxyphenyl]propionate]. It is an odorless, highly efficient, sterically hindered phenolic primary antioxidant which provides processing and long-term thermal stabilization. It offers light stability & excellent color retention. It protects...

Irganox® 1098

Irganox® 1098 by BASF is a N,N’-hexane-1,6-diylbis(3-(3,5-di-tert-butyl-4-hydroxyphenylpropionamide)). It is a sterically hindered phenolic antioxidant and an efficient, non-discoloring stabilizer for organic substrates such as plastics, synthetic fibers and elastomers. Provides low volatility, exce...

Irganox® 1330

Irganox® 1330 by BASF is 3,3',3',5,5',5'-hexa-tert-butyl-a,a',a'-(mesitylene-2,4,6-triyl) tri-p-cresol. It is a sterically hindered phenolic primary antioxidant for processing and long-term thermal stabilization. It is a highly effective stabilizer for organic substrates such as polymers, synthetic ...

Irganox® 1425 WL

Irganox® 1425 WL by BASF is a multifunctional phenolic antioxidant. It is a 1:1-combination of calcium-bis (((3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl)methyl)-ethylphosphonate) and polyethylene-wax. It is characterized by a very high extraction resistance, long term thermal performance and extreme...

Irganox® 3114

Irganox® 3114 by BASF is a sterically hindered phenolic antioxidant for processing and long-term thermal stabilization. It is a highly effective, non-discoloring stabilizer for organic substrates such as polymers, synthetic fibers, elastomers. Exhibits low volatility and high resistance to extractio...

Irganox® 245

Irganox® 245 by BASF is ethylene bis (oxyethylene) bis-(3-(5-tert-butyl-4-hydroxy-m-tolyl)-propionate). It is a primary, sterically hindered phenolic antioxidant for processing and long-term thermal stabilization. It has no odor and exhibits low volatility, good color stability and high extraction r...

Irganox® 1135

Irganox® 1135 by BASF is benzenepropanoic acid, 3,5-bis (1,1-dimethyl-ethyl)-4-hydroxy-C7-C9 branched alkyl esters. It is 100% active, sterically hindered phenolic primary antioxidant for processing and long-term thermal stabilization. Irganox® 1135 prevents the formation of peroxides in the polyol ...

Irganox® B 215

Irganox® B 215 by BASF is a synergistic blend of Irgafos® 168 and Irganox® 1010, a processing and long-term thermal stabilizer system. It maintains original melt flow and offers low color formation and long-term-thermal stability. Irgafos® 168, an organic phosphite of low volatility and particularly...

Irganox® B 225

Irganox® B 225 by BASF is a processing and long-term thermal stabilizer system. It is a synergistic blend of Irgafos® 168 and Irganox® 1010. It maintains original melt flow and offers low color formation along with long-term-thermal stability. Irgafos® 168, an organic phosphite of low volatility and...

Irganox® B 561

Irganox® B 561 by BASF is a processing and long-term thermal stabilizer system designed for use with polyolefins and olefin-copolymers. It is a blend of 80% Irgafos® 168 and 20% Irganox® 1010. It maintains original melt flow and offers low color formation. Irgafos® 168, an organic phosphite of low v...

Irganox® B 900

Irganox® B 900 by BASF is a synergistic processing and long-term thermal stabilizer system. It is a blend of 80% Irgafos® 168 and 20% Irganox® 1076. It maintains original melt flow and offers low color formation & long-term-thermal stability. Irgafos® 168, an organic phosphite of low volatility and ...

Irgafos® 168

Irgafos® 168 by BASF is tris(2,4-di-tert.-butylphenyl) phosphite. It is a hydrolytically stable phosphite processing stabilizer. It also acts as a secondary antioxidant which induces degradation and extends the performance of primary antioxidants. It has low volatility and is particularly resistant ...

Irgafos® 126

Irgafos® 126 by BASF is a high performance organo-phosphite processing stabilizer. It protects polymers from molecular weight changes and from thermo-oxidative degradation during processing by decomposing hydroperoxides to form non-radical, non-reactive products during the processing steps (compound...

Irganox® PS 800 FL

Irganox® PS 800 FL by BASF is didodecyl 3,3'-thiodipropionate. It is a general purpose heat stabilizer in combination with a phenolic antioxidant. It provides long-term thermal stability. Offers highest compatibility and lowest melting point of common thiosynergists. Irganox® PS 800 FL is suitable f...

Irganox® PS 802 FL

Irganox® PS 802 FL by BASF is a general purpose heat stabilizer in combination with a phenolic antioxidant. It is 3,3'-thiodipropionic acid dioctadecylester. With the lowest volatility of all BASF thiosynergists, it offers excellent performance with low odor. Irganox® PS 802 FL is suitable for polye...

Irganox® E 201

Irganox® E 201 by BASF is vitamin E-based primary phenolic antioxidant. It is 3,4-dihydro-2,5,7,8-tetramethyl-2-(4,8,12-trimethyltridecyl)-2H-1-benzopyran-6-ol. It provides excellent melt flow and color control during polymer processing. Offers optimal food shelf-life due to improved retention of po...

Irgastab® FS 301 FF

Irgastab® FS 301 FF by BASF is a non-phenolic system composed of a phosphite processing stabilizer Irgafos® 168 and a high molecular weight hydroxylamine Irgastab® FS 042. It acts as a processing-, heat- and light stabilizer. It is a blend of oxidized bis(hydrogenated tallow alkyl) amines (Irgafos® ...

Irganox® 1035

Irganox® 1035 by BASF is a sulfur containing primary phenolic antioxidant and heat stabilizer. It provides efficient processing stabilization, long-term thermal stability, excellent system compatibility and low color. It is compatible with polymers including polyolefins, polyethylene, polypropylene,...

Irganox® 565

Irganox® 565 by BASF is a 2,6-di-tert-butyl-4-(4,6-bis(octylthio)-1,3,5-triazin-2-ylamino) phenol. It is a high molecular weight, non-staining, multifunctional phenolic antioxidant primarily used as a post-polymerization process stabilizer for unsaturated elastomers. It exhibits low volatility, and ...

Irganox® 1520 L

Irganox® 1520 L by BASF is a multifunctional phenolic antioxidant for processing and long-term thermal stabilization. It is non-staining, non-discoloring, low volatility and is stable to light & heat. It effectively protects the substrate against thermo-oxidative degradation during processing and pr...

Irganox® MD 1024

Irganox® MD 1024 by BASF is a metal deactivator and primary (phenolic) antioxidant. It contains 2',3-bis [[3-[3,5-di-tert-butyl-4-hydroxyphenyl] propionyl]] propionohydrazide. Provides unmatched extraction resistance and processing stabilization. Used for telecommunications, polyethylene wire & cabl...

Irgastab® Cable KV10

Irgastab® Cable KV10 by BASF is a high performance, primary (phenolic) antioxidant and heat stabilizer for polyethylene-based wire and cable applications. It provides high efficient processing and long-term heat aging stability combined with excellent system compatibility. This sulphur-containing gr...

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