Energy savings plus mechanical reinforcement and rheology control

EVA Hot Melt for Both Wood and Plastic Veneer (Natural)

Adhesives Formulation

Applicable Type

Hot-melt Adhesives

Applicable Base Polymer

Ethylene Vinyl Acetates (EVA)

Applicable Industrial Sectors

Edge-veneering

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.

Advantages

Broad formulating latitude necessary for many different applications and adhesion to a wide variety of substrates
Quick setting – no cure or fixturing required
Retention of properties at low temperatures
Relatively low cost

Disadvantages

Cold flow (creep)
Attacked by some greases, oils, and solvents
High viscosity needed for maximum performance

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

Ethylene vinyl acetate resin, 32% EVA (Elvax 150, Dupont)

Ethylene vinyl acetate resin, 28% EVA (Elvax 210W, Dupont)

Ethylene vinyl acetate resin, 28% EVA (Elvax 250, Dupont)

Tackifier, hydrocarbon resin, 90°C mp (Regalrez 1139, Eastman Chemical)

xxx

Tackifier, coumarone indene resin, 105°C mp (Hikotack C90, Kolon Industries)

Tackifier, rosin ester 85°C mp (Foral 85, Eastman Chemical)

Antioxidant (Irganox 1010, Ciba)

xxx

Titanium dioxide

xxx

Superfine light barites

xxxx

Processing

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Resulting Properties

Edge veneering and edge banding constitute a primary market for hot-melt adhesives which are based predominantly on EVA copolymer resins. For some applications, however, formulated polyamide hot melts are also used, particularly where exceptional heat resistance of the bond is required. A starting formulation for a low cost, general purpose EVA hot melt formulation for bonding wood veneer is given in the table above. The source of this formulation EVA Hot Melt for Both Wood and Plastic Veneer (Natural) is Pizzi, A. and Mittal, K.L., eds., Handbook of Adhesive Technology, Chapter 37, “Hot Melt Adhesives”, Pizzi, A., Marcel Dekker, New York, 2003.