A number of specialized Dow™ Elvaloy® resins can be used to make polycarbonate compounds tougher, while improving thermal processing efficiency and delivered mechanical properties.
Using Elvaloy® AC Toughening Resin for Polycarbonate (PC)
Polycarbonate compounders can use Elvaloy® AC resins to get the same or better physical performance obtained with other modifiers, plus several additional benefits:
- Lower manufacturing costs
- Improved yields from a wider processing window and better thermal stability
- Faster processing speeds, enabled by lower viscosity
- Increased compound formulating and design flexibility
- Customized cost-performance to meet differentiation needs in the market
- Eliminate handling of messy powder materials by using pellets
Toughening PC/ABS Blends
Impact strength properties of PC-based resins blended with ABS can be enhanced by adding Elvaloy® 1125AC ethylene acrylate copolymer (EAC), as shown on Graph 1.
|GRADES USED TO MODIFY PC/ABS BLENDS||MELT INDEX G/10 MINUTES||GENERAL PURPOSE TOUGHENER|
|Elvaloy® AC 1125||0.4||x|
|Elvaloy® AC 1224||2||x|
|Elvaloy® AC 3427||4||x|
Graph 1: Impact modification enhancement in PC blended with ABS
With Elvaloy® AC or dual modifier systems of Elvaloy® AC and Elvaloy® PTW, polycarbonate compounders can develop improved impact strength at 23°C, 0°C and -20°C, and improve ductility as seen in elongation tests, without sacrificing deflection (HDT). Using Elvaloy® reduces melt viscosity by up to 17%, reduces melt fracture in the polycarbonate compound, and expands the material’s thermal processing window.
Elvaloy® Toughens Polycarbonate Compound Blends with PBT
As shown in Graph 2, Dow™ Elvaloy® PTW is an excellent toughener for PC/PBT alloys, over a broad blending ratio. It helps improve impact strength over the unmodified alloys at room and low temperatures, and helps create super toughness at 23°C and 0°C.
Graph 2: Super toughness improvement results in PC blended with PBT
Using Elvaloy® can create a significant improvement in tensile strength and thermostability vs. MBS-modified compounds, and better elongation and high-temperature flex modulus vs using acrylic or MBS modifiers.
Injection molded bars of tough polycarbonate compounds made with Elvaloy® have outstanding appearance.