Nylon Modification

Nylon Modification with DuPont Polymer Modifiers

Customizing the impact strength of polyamide (PA) compounds

DuPont’s broad  range polymer modifiers for nylon modification, including ionomers, ethylene copolymers and grafted polymers, can help customize the impact strength of polyamide (PA) compounds. From general-purpose toughness to intermediate and super-tough levels, DuPont nylon impact modifiers meet the unique needs of PA 6, PA 6,6 or glass-reinforced PA compounds.

DuPont polymer modifiers for nylon impact modification include:

  • Fusabond® grafted polymers 
  • Surlyn® inomer resins

With its Fusabond® and other nylon impact resins, DuPont offers low-modulus polyolefins with reactive groups providing anhydride and acid functionalities. The reactive groups enable chemical bonds, boosting adhesion of the toughener or impact modifier to the continuous phase of the compound.

Nylon impact strength measured by Notched Izod testing depends very much on test temperature.  Thus a nylon modifier may provide super-toughness at room temperature, yet only achieve general-purpose toughness at -40°C test temperatures.

Fusabond® Grades Used for Nylon Impact Modification
grades to Toughen
PA6 PA6,6 Glass-
Fusabond® N493 x x x Super toughening

Fusabond® N416
  x x Super toughening: Balance between toughness

Fusabond® N525
x x    

Fusabond® A560
x x x Moderate toughening, enhanced gloss, mainly used in glass-reinforced systems


The graphs below illustrate the broad range of performance level achieved based on different toughener requirements:

Graph 1: PA6 - Improved toughening performances of Fusabond® N493 resin
Graph 2: PA6,6 - Improved toughening performances of Fusabond® N493 resin
Graph 3: PA6,6 - Improved toughening performances of Fusabond® A560 resin

In applications such as sporting goods, using Fusabond® can increase low temperature nylon impact toughness, or deliver intermediate toughness at reduced cost (lower loadings). Improved flow for higher productivity can be achieved with Fusabond® N 598 in PA6. Fusabond® also can be a good choice for surface appearance (up to Class A) or nylon color compounding.

DuPont™ Fusabond® nylon impact modifiers increase toughness by providing high polymer affinity to glass and mineral fillers. At concentration as low as 3.5% to 7%, for example, Fusabond® A560 can increase the Notched Izod impact strength of glass-reinforced (GR) nylon by up to 30% to 50%.

Two additional benefits of using Fusabond® compared to other nylon impact modifiers are:

  • Reduced compound melt viscosity, which can help with mold filling and surface appearance of glass-filled parts; and
  • Better mechanical property retention, sacrificing less of the compound’s needed tensile strength, modulus, or heat deformation temperature in order to meet needed nylon impact resistance.

Ionomer Resin For Cost-Effective Single-Screw Nylon Impact Toughening

DuPont™ Surlyn® ionomer resin also can be used to boost nylon impact resistance.  Its polymer chemistry facilitates dispersion into nylon. This helps single screw extruders make toughened alloys that can meet food contact requirements, or make tough nylon molding compounds.  Several ionomer grades for nylon impact modification are described further on the Surlyn® ionomer resin page.

As a Nylon Toughener, Surlyn® Helps Tailor Performance:  General-Purpose, Intermediate or Super Tough

DuPont™ Surlyn® ionomer resins become finely dispersed (<0.3µm particle size) in nylon, enabling use of single screw extruders to make toughened alloys. Higher modifier loadings increase toughness, while improving gloss in molded parts such as motorcycle body trim.

Grades of Surlyn® nylon toughener include many with U.S. Food and Drug Administration (FDA) food contact compliance as well as food approvals in Europe. Surlyn® grade selection and loading levels allow for general-purpose, intermediate and advanced nylon toughening.

Using Surlyn® ionomer resins is one of several ways to toughen nylon or polyamide (PA) resins.