The Universal Selection Source: Polymer Additives

Selection Guide

Techno Brief: Impact Modifiers for Engineering Plastics

Impact Modifiers or toughners (elastomer or a plastic of different type) are added to a plastic compounds to improve the impact resistance of the finished product. This Impact Modifiers guide is designed to help you understand how to improve the impact strength of engineering plastics used in demanding applications while retaining the cost/performance balance.

Polycarbonate & Recycled PC

Impact and processing modifiers for Polycarbonate
Polycarbonate (PC) is known for its transparency, its excellent resistance to impact and its ability to withstand high temperatures during the lifespan of the final article.

However, PC's low chemical resistance (gasoline) is an issue for automotive applications. The injection molding of high viscosity grades is another limitation, especially when high impact resistance is required.

Moreover inherent performances of PC, such as impact, are also seriously compromised when colored pigments, fillers or flame retardant additives are used in the compound.

Recycled PC are a cost effective solution for compounders. However, the recycling steps reduce PC's mechanical performance, making the use of impact modifiers necessary in recycled PC, in order to reach the desired level of performance.


  Exceptional Low Temperature Impact Performance

MBS Impact modifiers allow PC and particularly high flow PC to achieve high impact performance at very low temperatures.

High performance impact modifiers based on Butadiene rubber (ABS or MBS) are detrimental to the inherent UV and heat stability performances of Polycarbonate. In weatherable outdoor applications or in high heat environment, it will be critical to use a very stable impact modifier that will still provide high impact performances. Impact modifiers are designed to respond to this technical challenge.

  Excellent Weatherability & Heat Aging

MBS Impact modifiers provide excellent weatherability expected of an all-acrylic impact modifier. This allows impact modifiers to be used in applications that demand good color hold and retention of mechanical properties upon typical outdoor exposure, yielding products that retain long-term performance under severe conditions.

  Exceptionnal Mold-in Colorability

MBS Impact modifiers provide far more superior colorability than most of the acrylic modifiers available on the market, which are known to lower color intensity thus making dark color parts difficult if not impossible to achieve. Based on a patented technology, they have open the door for applications that demand good color hold and unique mechanical properties retention upon exposure to the elements.

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