The Universal Selection Source: Adhesives Ingredients

Formulation

EVA Hot Melt Pressure Sensitive Adhesive

Applicable Type
Applicable Base Polymer
Applicable Industrial Sectors

Typical Formulation Ingredients

Phase
Ingredient
Parts by weight
Ethylene vinyl acetate copolymer (Elvax 200, Dupont) 
   
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    Mineral oil 
       
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    Polyterpene resin (Wingtack 95, Cray Valley) 
       
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    Polyterpene resin (Wingtack 10, Cray Valley) 
       
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    Typical Properties

    Properties
    Brookfield viscosity, cps at 150° C 
       
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    Brookfield viscosity, cps at 175°c 
       
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    Ring and ball softening point, °C 
       
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    Lowered molten viscosity with little effect of softening point 
       
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    Good tack adhesion 
       
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    Reduced possibility of stringing on applicators 
       
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  • Applicable Base Polymer Properties

    Hot melt EVAs are made from a combination of solid thermoplastic copolymers, tackifying resins, and waxes that function with the right viscosity when applied in the bookbinding operations. EVA adhesives demonstrate strong adhesive properties, but most importantly they set quickly by virtue of their hot melt character. EVA resins are considered to be relatively safe to use in food applications.

    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

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