Impact modifiers are added to plastic compounded materials to improve durability and toughness of a variety of plastic resins.
According to end-use applications and polymer intrinsic resistance, formulators need to achieve very different level of impact resistance, from general purpose to super toughness.
General Purpose Impact Modification
General purpose impact modification is a very low level of impact modification which is, for instance, applied to avoid conditioning of molded PA parts. It translates to reasonable room temperature impact strength but does not take into account any requirements for low temperature (below 0°C) impact strength. For most of this type of applications only low levels of impact modifier will be required (<10%) and the impact modifier does not necessarily have to contain reactive groups to be acceptable for the application.
Low Temperature Impact Modification
Low temperature impact strength is needed for applications that require a certain level of low temperature flexibility and resistance to break. This is for example the case for many applications in the appliance area. For this purpose, modifier levels between 5-15% of mostly reactive modifiers will be necessary.