BNX 2777

Antioxidants Products

UV Light Stablizers Products

Optical Products

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Beta Nucleating Masterbatch Products


BNX 2777 (40601-76-1 & 31570-04-4) is a primary and secondary antioxidant blend using an phenolic antioxidant (BNX 1790) and a phosphite type antioxidant (Benefos 1680).  The primary antioxidant provides superior polymer stabilization and has excellent compatibility with polymeric HALS’s and UVA’s.  The secondary antioxidant provides excellent heat stability and antioxidation, with good compatibility with resins and excellent extraction resistance.


Chemical Name:            BNX 1790:               1,3,5-Tris (4-tert-butyl-3-hydroxy-2,6-dimethyl


Benefos 1680:          Tris (2,4-di-tert-butylphenyl) phosphite

CAS Number:                  BNX 1790:               40601-76-1

Benefos 1680:          31570-04-4

Chemical Structure:

BNX 1790:                                                                Benefos 1680:

BNX 1790Benefos 1680

Typical Properties         

Product Form:                   Solid

Melting Point:                    BNX 1790:               159-163oC

   Benefos 1680:         183-187oC

Molecular Weight:             BNX 1790:                699

   Benefos 1680:          647


BNX 2777 is a convenient blend of both a primary and secondary antioxidant. This synergistic blend addresses a broad range of stabilization needs. The resistance to “gas fading” makes it ideal for use as a melt processing stabilizer in polyolefins such as polypropylene, polyethylene, polyolefin copolymers and blends, and TPO’s. BNX 2777 is also suitable for use in linear polyesters, high impact polystyrene, ABS, PVC, EPDM, nylon, acetals, and polyurethanes.


  • Ease and convenience for compounding operations
  • Compatible with polymeric HALS and UV absorbers
  • Provides excellent melt stability in a wide range of polyolefins
  • Low water carryover
  • Resistant to “gas fading” discoloration and black speck formation
  • FDA cleared for use in polyolefins and polystyrene

Guidelines for Use

Typical recommended loading concentrations in polyolefins and polystyrene range between 0.05% and 0.5%. BNX 2777 is also suitable for use in combination with 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.


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.


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

FDA Regulations

The components of BNX 2777 have been FDA cleared for use in olefin polymers and polystyrene (including rubber-modified polystyrene) under 21 CFR §178.2010. Please contact your Mayzo representative for complete details, including restrictions of use.

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