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    The SI Group POLYBOND™ portfolio of coupling agent allows polyolefin-filled polymer compounds with reinforced physical properties and improved impact strength. With changes in consumer environmental expectations and increased virgin resin prices, costs and market trends require companies to consider incorporation recycled polyolefin resins. Processing difficulties and challenges with overall physical properties arise for any recycler when manufacturing without incorporating virgin resin. 


POLYBOND™ coupling agent additives assists various polyolefin-reinforced composites containing wood fiber, glass fiber, cellulose fiber, or mineral-filled applications. During the melting process, plastic tends to phase-separate resulting in structural weakness in the finished material. Incorporating a coupling agent into your formulation can improve the quality of the resulting product in two ways: first by improving bonding at the phase boundaries, and second by better incorporating the pigments and fillers present.


Benefits of POLYBOND™ for Recycled Polyolefin Composites

  • Impact & Tensile Strength
  • Flexural Strength
  • Heat Deflection Temperature
  • Filler Dispersion
  • Improved Interfacial Adhesion


Explore the various SI Group coupling agent grades below that work best for your resin system and formulation. 


    Grade Resin Type Modifier Key Properties
    POLYBOND™ 1001N Polypropylene Acrylic Acid Provides improved adhesion of PP to metals and other polar surfaces.
    POLYBOND™ 1002 Polypropylene Acrylic Acid Coupling agent for glass or mica-filled polypropylene composites. Provides good adhesion to metal substrates.
    POLYBOND™ 1009 Polyethylene Acrylic Acid Coupling agent for glass or mica-filled polyethylene. Provides good adhesion to metal substrates.
    POLYBOND™ 3000 Polypropylene Maleic Anhydride Improved strength and hydrolytic stability in filled PP systems. Ideal for tie-layers between multilayer polar and non-polar materials and for improved ink adhesion to non-woven PP.
    POLYBOND™ 3002 Polypropylene Maleic Anhydride Glass fiber, cellulose fiber, or mineral-filled PP. Compatibalizes PP/PA and PP/EVOH blends to improve processability, mechanical properties, and long-term heat aging resistance.
    POLYBOND™ 3009 Polyethylene Maleic Anhydride Improves strength and impact resistance. Provides good adhesion in film and sheet applications.
    POLYBOND™ 3029 Polyethylene Maleic Anhydride Improves tensile, flexural, and impact strength. Lowers water absorption. Ideal in wood and natural fiber-filled PE composites.
    POLYBOND™ 3150 Polypropylene Maleic Anhydride Improved flexural/tensile strength and hydrolytic stability. Ideal for tie-layers between polar and non-polar materials and compatibalizing PA/PP blends.
    POLYBOND™ 3200 Polypropylene Maleic Anhydride Low addition coupling agent for filled PP systems that improves strength and impact performance. Provides good adhesion in film and sheet applications, and compatibalizes PP/PA blends.
    POLYBOND™ 3349 Polyethylene Maleic Anhydride Glass-filled PE composites with high mineral filler levels. Enhanced hydrolytic stability and strength to compatibalize PE/PA blends. Functions as a process aid for halogen-free W&C compounds by improving dispersion and mechanical properties.
    POLYBOND™ 7200 Polypropylene Maleic Anhydride High-efficiency coupling agent for cellulose-filled PP by reducing water uptake and providing higher flexural/tensile strength and impact properties.


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