EVA HMPSA

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

A

Ethylene vinyl acetate copolymer (Elvax 200, Dupont)

xx

A

Mineral oil

xx

A

Polyterpene resin (Wingtack 95, Cray Valley)

xx

A

Polyterpene resin (Wingtack 10, Cray Valley)

xx

Typical Properties

Properties

Brookfield viscosity, cps at 150° C

xxxx

Brookfield viscosity, cps at 175°c

xxxx

Ring and ball softening point, °C

xx

Lowered molten viscosity with little effect of softening point

Good tack adhesion

Reduced possibility of stringing on applicators

Processing

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Resulting Properties

EVA copolymers having vinyl acetate content of 40% or higher have utility as PSAs. These copolymers, which also require high levels of tackifiers, were at one time the base materials for HMPSAs, but they have almost completely been displaced by the triblock copolymers. Although somewhat lower in cost than styrene block copolymers, EVA has been unable to compete successfully because of low tack and poor shear strength especially in applications requiring elevated temperature resistance.

Source: Adhesives Formulary Handbook, NIIR Board, Asia Pacific Business Press, Inc., 2010, p. 296

Tips and Tricks

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