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EVA Hot-melt Glue Stick Adhesive Formulation

August 28, 2019

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.

Typical Formulation Ingredients

Ingredient
Parts by weight
EVA polymer (25% VA, MI=400)
xxxx
EVA polymer (25% VA, MI=19)
xxxx
Styrenated terpene resin
xxxx
CHDM dibenzoate (Benzoflex 352, Eastman)
xxxx
Antioxidant
xxx
(Source: Streeter, B.E., “Plasticizers for Solvents and Hot Melt Adhesives”, Velsicol Chemical Corp.)
 

Typical Properties

Properties
Shear adhesion failure temperature, °C
xx
Open time, secs
xxx
Viscosity, mm cps @ 350°F
xxxx
Adhesion to glass, paper
xxxxxxxxx
Adhesion to steel, concrete, PVC, wood

Resulting Properties

A starting formulation for a general purpose EVA hot melt stick formulation is given in the table above. 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. This allows the adhesive to be used not only in food packaging but also in food cooking and other food preparation applications.