Ultra fine calcium carbonate Omyabond 120

EVA Hot Melt Adhesive for Deep-Freeze Applications (A)

Adhesives Formulation

Applicable Type

Hot-melt Adhesives

Applicable Base Polymer

Ethylene Co-terpolymers - Solids (EVA, EMA)

Applicable Industrial Sectors

Papers & Packagings

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 specific operations. EVA adhesives demonstrate strong adhesive properties, but most importantly they set quickly by virtue of their hot melt character.

Typical Formulation Ingredients

Ingredient

Parts by weight

Ethylene vinyl acetate (Evathane 28/40, Arkema)

xxxx

Ethylene vinyl acetate (Evathane 28/400, Arkema)

xxxx

Hydrocarbon resin (Kristalex F85, Eastman Chemical)

Hydrogenated rosin ester (Foralyn 90, Eastman Chemical)

xxx

Paraffin wax 68/70

Fischer-Tropsch wax (Sasolwax C80, Sasol Wax Company)

Antioxidant (Irganox 1076, Ciba)

xxx

(Source: “Deepfreeze Applications”, Eastman Chemical Company)

Typical Properties

Properties

Low temperature flexibility, mandrel diameter mm,

@-5°C

@-15°C

xxx

Tensile strength, MPa, @ -30°C

Elongation, %, @ -30°C

Processing

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Resulting Properties

Starting formulations for an EVA hot melt formulation commonly used for frozen products are given in the table above. This specific adhesive is noted for excellent hot tack, odor, and color. It has good adhesion to a variety of packaging films and can be applied over most wax based carton coatings, providing an excellent seal. Bending the test specimen over a mandrel at -5°C and -15°C provides a good indication of the low temperature flexibility of the hot melt adhesive. Superior flexibility manifests itself by small mandrel diameters. The diameter of the smallest mandrel over which the sample does not break is shown in the table. EVA resins are considered to be relatively safe to use in food applications. Certain adhesive manufacturers offer EVA resins that are approved for indirect food contact (FDA 21 CFR.175) applications.

Tips and Tricks

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