Effective Rigid PVC Modification with DuPont™ Elvaloy®
DuPont™ Elvaloy® resin modifiers improve the performance and lower the cost of rigid PVC compounds
For makers of rigid PVC products, DuPont™ Elvaloy® resin modifiers widen the melt temperature processing window and lower PVC compound viscosity without increasing fusion time.
Benefits of Using Elvaloy®
- Increased production rates due to ductile dart-drop impact performance at lower extrusion temperatures. Parts will cool faster, extrudate should be stiffer and easier to handle, size etc.
- Reduced ingredient costs by increasing the low-cost filler level, reducing thermal stabilizers and/or reducing process aids
- Better ductile impact performance at higher filler loadings that competitive products
- Smoother extrudate surfaces, as evidence by higher gloss, will maintain impact performance longer and resists cracking better
The following table shows Gardner dart drop test* results comparing PVC impact brittleness for three different modification resins at three different processing temperatures:
|ACRYLIC||ELVALOY® 4924||ELVALOY® HP661|
*Gardner Drop Dart: ASTM D4226 "Impact Resistance of Rigid PVC Building Products" - Procedure B. All samples are tested until either brittle failure or the capacity of the test was exceeded at 264 in.-lb.
A Range of Choices for PVC Impact Modification
The following table lists DuPont™ Elvaloy® terpolymers (arranged by chemical type) used for rigid PVC toughening:
ELVALOY® GRADE USED IN RIGID PVC
|POLYMER TYPE||MELT INDEX (G/10 MIN.)||DENSITY (G/CM3)|
Although effective when used as the primary PVC impact modifier, Elvaloy® also can be used in combination with other impact modifiers to balance viscosity, die swell and cost.