Energy savings plus mechanical reinforcement and rheology control

Amorphous Polypropylene Hot Melt Laminating Adhesives

Adhesives Formulation

Applicable Base Polymer Properties

Polyolefins are generally not thought of as adhesives because as a substrate they are so hard to bond. However, polyolefin resins make excellent hot melt adhesives because they do have a low surface energy and wet most polymeric and metallic substrates.
Adhesives that are based on polyolefin resins are used mainly as hot melt adhesives in either block or film form. In film form, they provide excellent peel strength as a hot laminating adhesive for plastic films and metallic foils. Polyethylene adhesive films are also used in extrusion coating. In this application a ply of polyethylene is extruded onto a structure to provide a heat sealing medium for later bonding.

Typical Formulation Ingredients

Ingredient

Parts by weight

Amorphous polypropylene (2,300 cps)

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C-5 resin, 100°C

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C-5 resin, 130°C

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75°C wax

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Maleated polyethylene (4,000 cps)

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Typical Properties

Properties

Viscosity at 177°C, cps

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Ring and ball softening point, °C

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Set time – corrugated board, sec

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Processing

Resulting Properties

Polyolefin hot melt adhesive have good thermal stability (minimal color changes and reduced gel formation on standing in the melter). Ring and ball softening points are generally I the 100-130°C range. Melt viscosities can have a wide range due to molecular design and additives. Polyolefins are compatible with many tackifers. Many are also approved by FDA for direct food contact and are oil and water resistant.
The formulation above describes a hot melt laminating adhesives based on amorphous polypropylene (APP). Such adhesive are often used in packaging applications especially on plastic film.

Tips and Tricks

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