DuPont Polymer Modifiers - Using solids phase (polymeric) PVC flexibilizers

Flexibilizing

DuPont Polymer Modifiers < Functions < Flexibilizing PVC

Description and examples of polymer modifier functionalities

	Coupling/Adhesion
	Toughening
	Compatibilizing
	Flexibilizing PVC
	Masterbatch Resins

Presentation/ Publication Library

Using solids phase (polymeric) PVC flexibilizers

Create flexibility that won't fade or migrate out of the polymer

For flexible PVC, DuPont™ Elvaloy® adds permanent flexibility, enabling the development of higher-value products such as single-ply roofing, environmental liners, "no-dig" water and sewer pipe repair liners, coated fabrics, footwear, and wire and cable jacketing.

Many flexible PVC products incorporate liquid plasticizers. However, such systems tend to lose flexibility over time, as the liquid plasticizers migrate to the surface of the plastic and are lost to the environment. Plasticizer loss can lead to brittle failure of the PVC sheet or component.

In contrast, Elvaloy® copolymers deliver toughness and flexibility that's "locked in" to the PVC. A number of grades are available for use in flexible PVC compounding. These solid-phase plasticizers are highly miscible in PVC, and their high molecular weight keeps them from migrating out of the compound.

Elvaloy® products for flexibilizing PVC

Copolymer	E/VA/CO		E/nBA/CO
Grade No.	741	742	HP441	HP661	HP662	HP771

Typical Properties
Melt Index, g/10 min.	35	35	8	12	25	100
Density, g/cm³	1.00	1.02	0.98	0.96	0.96	-
Tensile Strength, psi	860	610	495	495	495	315
Elongation at Break, %	950	1,200	1,213	1,050	1,050	580
Durometer, Shore A	70	55	59	69	69	62
Glass Transition Temp., °C	-32	-32	-54	-54	-54	-
Crystalline Melt Temp., °C	66	45	59	62	62	63
Solubility* Parameter	8.85	8.85	8.81	8.81	8.81	8.78
Molecular Weight Distribution	Normal	Normal	Normal	Narrow	Narrow	Normal

Note: All properties are typical values not to be used as specifications.
* Estimated

Additional reference

Building a Better PVC
Reprinted from Roofing Technology magazine

Because DuPont cannot anticipate or control the many different conditions under which this information and/or product may be used, it does not guarantee the applicability or the accuracy of this information or the suitability of its products in any given situation. Users of DuPont products should make their own tests to determine the suitability of each such product for their particular purposes. The data listed herein falls within the normal range of product properties but they should not be used to establish specification limits or used alone as the basis of design.

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