Antioxidant Masterbatches

Antioxidant Masterbatches

Plastics are susceptible to thermo oxidative degradation during process and usage. This may be because of higher temperatures, high shear rates or under the effects of light & oxygen. This will cause:

1. Loss of strength.
2. Loss in elongation
3. Surface may become rough and less glossy
4. Color fading or discoloration

Oxidation is a chain reaction process involving free radical and hydroperoxide intermediates. Antioxidants decompose the free radicals by chemical reaction. Polymer manufacturers add antioxidant in certain polymer grades but this will not be sufficient to withstand number of processing cycles, higher shear or temperature. This results in degradation of polymer thereby deteriorating mechanical properties.

Different families of antioxidants are reactive with different intermediates in the oxidation process.

Different types of Antioxidants:

There are two types of antioxidant and they are as follow:

1. Primary Antioxidant

Primary Antioxidants such as hindered phenols interrupt the primary oxidation cycle by removing the propagating radicals. Aromatic amines tend to discolour the end product and hence their use in plastics is limited. Phenolic antioxidants are commonly used in most of the polymers. Phenolic antioxidants protect plastics or other polymers against degradation and oxidation at high processing temperatures.

2. Secondary Antioxidant

These type of Antioxidants stops degradation by preventing the generation of free radicals. Any biproducts produced by the hydroperoxide decomposition are transferred in to non-reactive thermally stable products. Commonly used secondary Antioxidants having either Phosphites or phosphonite groups or Organic Sulphur containing compounds and dithiophosphonates are widely used.

Selection of Antioxidants depends on a number of factors.
1. Base polymer,
2. Extrusion temperature
3. Performance targets for the end product.

The Efficiency of an antioxidant n polymers is determined by three processes: the chemical reactivity, the physical loss and a minimal effective concentration. Uniformity and dispersion depends upon processing and also the ability of the additive to reach the polymer’s attacked sites by diffusing through the viscous melt. Combination of antioxidant additives are always preferred for protection at different levels of processing and even in service life.

Antioxidant Masterbatches help you combat the degradation of plastic due do oxygen and heat. The antioxidant systems suitable for various polymers are selected considering the end applications. For example Antioxidants added in agricultural films to improve thermal stability, prevents discoloration and maintains transparency.

Kandui’s experienced team has developed antioxidant formulations offering combination products that not only provide in-process stabilisation but also enhance lifetime performance.


  • Blow Moulding
  • Roto Moulding
  • Injection Moulding
  • Blown Film – Mono layer / Multi Layer
  • Extrusion / Co- Extrusion / Lamination
  • BOPP Films
  • BOPET Films
  • Cast Films
  • TQ Films
  • Sheet Extrusion
  • Thermoforming
  • Extrusion Coating / Lamination
  • Mono Filament / Multifilament
  • Raffia
  • Non-Woven
  • PET Strap
  • Polyester Staple Fiber
  • Recycled POY/PSF
  • Spinning BCF
  • Spinning FDY/POY
  • Spinning LOY
  • Extrusion Cables
  • Extrusion – Pipe & Fittings
  • Reprocess
End Products:

  • Drum
  • Jerry Cans / Bottles
  • Mineral Water Jar
  • Preforms
  • Tanks
  • Pallets
  • Automotive Parts
  • Road Barriers
  • Toys
  • Waste bins / Dust bins
  • Electric Housing / Electronic Housing
  • Furniture & Household Goods
  • Luggage
  • Stationary
  • Medical Components
  • Caps
  • Cutlery
  • Films
  • Carry Bags / Shopping Bags / Garbage Bags
  • Paint Pales
  • Cross Laminated Tarpaulins
  • PET Film / Sheet
  • PS / HIPS Sheet
  • PC Sheet
  • Agricultural Films / Nets
  • Packaging
  • Sun Control Films
  • Wrappers
  • Breathable Films
  • Non Breathable Films
  • Garments
  • Packaging
  • Disposables
  • Tarpaulin
  • Raffia Lamination
  • Bristles
  • Jumbo Bags
  • Diapers
  • Straps for Wrapping Boxes/Cartons/Bale Covers
  • Grey & Dyed Fabric
  • Cloth / Textile Grade Yarn
  • Jelly Filled Telephone Cable
  • Optical Fiber Cable
  • Transmission Cables
  • HDPE Pipe & Fittings
  • PPR Pipe & Fittings
  • Drip Pipes
  • PS/HIPS Sheet
  • BOPP/BOPET Lamination
  • Paper Cups
  • Corrugated Boxes
  • Fishing Nets
  • Mats
  • Belts / Niwar
  • Woven Bags (Cement/Fertilizer/Leno)
  • Wipes
  • Industrial Yarn
  • Home Furnishing
  • Bath Rugs/Mats
  • Sportswear / Winterwear
  • PPE (Mask, Suits, Cap etc)
  • Medical usage fabric
  • Sewing Threads
  • Textiles
  • Under-garments
  • Sportswear
  • Knitted fabrics
  • Carpets
  • Pipes

We welcome you to please speak to our Marketing representatives for your specific requirements. We will be more than happy to cater to your needs.



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