Surlyn® for Polymer Modification

Polymer Modification Improves Toughness, Uniformity, and Processability

DuPont™ Surlyn® for polymer modification is used as a processing aid and compatibilizer in PET and has a unique use as a toughener in automotive parts.

When used for polymer modification, DuPont™ Surlyn® improves toughness and adds high gloss to automotive parts, increases uniformity in incompatible PET blends, and improves PET injection and extrusion blow molding processes.

Toughening Resin for Nylon

Surlyn® is a toughening resin for polyamides (nylon 6 and nylon 66). It becomes finely dispersed (<0.3µm particle size) in nylon, enabling single screw extruders to make toughened alloys.

For example, Surlyn® is used to increase toughness in automotive parts made from nylon.

Surlyn® as nylon toughener provides:

  • Excellent toughening at room temperature
  • Higher modifier loadings which increase toughness

Grades are available at different toughening strengths:

  • General purpose: Surlyn® 9520 and 9521
  • Intermediate: Surlyn® 9020
  • Super-Tough: Surlyn® 9320 and 9020 at higher loadings

Compatibilizer Resin in PET

Surlyn® 8920 as a Compatibilizer

Surlyn® can be used as a compatibilizer resin. Adding Surlyn® to incompatible PET polymer systems increases blending uniformity and enhances mechanical properties such as elongation, impact strength, and flexural (or bending) modulus. Resins that can be compatibilized with PET by using Surlyn® include LDPE, LLDPE, HDPE and other polyolefins. Adding Surlyn® with Elvaloy® AC into CPET improves low temperature impact resistance in CPET trays.

Processing Aids for PET

Surlyn® 8920 as a Nucleant

Adding Surlyn® 8920 as a nucleating agent can reduce PET crystallization temperature in the injection molding process, which can speed up solidification of the PET melt, improve parts ejection, and shorten the molding cycle time for CPET and APET food trays.

Surlyn® 8920 as a Rheology Modifier

Surlyn® 8920 can also be used as a rheology modifier to improve PET compounding and downstream fabricating processability for injection molding, blow molding, and extrusion. Surlyn® can also alter melt viscosity and melt strength, resulting in improved product appearance, product performance, and processing productivity.  

With the ability to deliver high performance for a variety of uses, Surlyn® is an excellent resin for polymer modification.

Six Top Packaging Design Ideas


  • Beverage and Food Packaging Design

    DuPont works with food manufacturers, converters, and retailers to create innovative beverage and food packaging design solutions to help products stand out on the shelf, stay fresh, and meet safety standards.


  • Surlyn® Sealants

    DuPont™ Surlyn® sealant resin provides excellent clarity, hot tack, heat seal, and toughness for packaging a variety of foods, as well as pharmaceuticals, household cleaners, and personal care products.

  • Elvaloy® Polymer Modifier

    DuPont™ Elvaloy® for polymer modification is used to improve toughness in CPET and APET trays for frozen and refrigerated ready-to-eat meals, as a PVC plasticizer and as a compatibilizer in PET/HDPE recycling.

  • Surlyn® for Blow Molding

    DuPont™ Surlyn® blow molding resins provide high gloss, scratch resistance, pleasant touch, and squeezability to cosmetic bottles and transparent tottles for lip gloss.

  • Nucrel® for Packaging

    DuPont™ Nucrel® resin acts as a foil adhesive and heat sealant for beverage packaging, condiment and spice oil sachets, as well as non-food products including toothpaste tubes and cable shielding.

  • Nucrel® AE for LDPE Extrusion Coating

    DuPont™ Nucrel® AE for LDPE extrusion coating improves foil adhesion when used as an LDPE modifier in pouches and sachets for food oils, snacks, and non-food products.

  • Surlyn® for Skin & Stretch Packaging

  • Cheese packaging | DuPont™ Elvax® EVA

    Elvax® for Packaging

  • Elvaloy® AC Acrylate Copolymer

  • Surlyn® for Extruded Shapes & Sheets

    DuPont™ Surlyn® extrusion resin provides toughness, durability, and abrasion and chemical resistance for demanding applications, including shock tubes for mining and construction to snowshoes and wake/bodyboards.

  • Surlyn® for Medical Device Packaging

    DuPont™ Surlyn® for thermoforming film provides excellent clarity and formability, making it a cost-effective solution for sterilized medical device packaging.

  • Surlyn® Reflections for Molded-In Color

    Surlyn® Reflections high gloss resin is a thermoplastic alloy made up of ionomer and polyamide, enabling manufacturers to mold tough and durable, high-gloss parts that require no painting.

  • Wire and cable jacketing | DuPont™ Elvax® EVA

    Elvax® for Industrial & Consumer Products



  • Foam Packaging Alternative

    Coldpack’s Airliner thermally insulated pouch is a foam packaging alternative for shipping temperature-sensitive products, made with three DuPont resins.

  • Barrier Packaging for Baby Food

  • Foam Trays

    European packaging converter WipakGryspeert uses DuPont™ Bynel® in foam trays for a more efficient, flexible, and fresher packaging solution for meat, seafood and ready-to-eat meals.

  • Impact Modifier for Toughened Nylon

    DuPont offers several polymer impact modifier technologies that can be used for toughened nylon, increasing low-temp. impact properties with good adhesion to nylon.