Waterborne Polyurethane Heat Sealable Coating

Adhesives Formulation

Applicable Type

Waterborne Adhesives , Polyurethane Adhesives

Applicable Base Polymer

Polyurethane Dispersions (PUDs)

Applicable Industrial Sectors

Papers & Packagings

Applicable Base Polymer Properties

Polyurethane adhesives are often chosen over other thermoplastic adhesives when greater resistance to plasticizer migration is required or difficult to bond polymeric substrates are involved. One of the largest applications is in footwear where high bond strengths to PVC compositions are required. However, PUDs have not, as yet, found a large market in pressure sensitive adhesives.

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

Prepolymer:

Polyol – Sulfonated polyester polyol, 0.65 hydroxyl equivalents (Ruccoflex XS-5570-55, Ruco Polymer Corp.)

xxxxx

Isocyanate

Hexamethyl dissocyanate, 0.8 isocyanate equivalents

xxxx

Isocyanate

Isophorone dissocyanate, 0.327 isocyanate equivalents

xxxx

Processing

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Resulting Properties

Polyurethane adhesives give the formulator more freedom in “engineering” the modulus and elongation required of the adhesive film to meet specific applications. The PUD resulting from the above formulation has no VOCs and is free of solvent, catalyst, and other additives. It is a starting PUD for a waterborne polyurethane that is used as a heat sealing adhesive in food packaging applications. It can be formulated as a thermoplastic or thermosetting system with the addition of isocyanate.

Tips and Tricks

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