Energy savings plus mechanical reinforcement and rheology control

Polyterpene / Polyethylene HMA for Coating Labels

Adhesives Formulation

Applicable Type

Hot-melt Adhesives

Applicable Base Polymer

Polyethylene & Derivatives

Applicable Industrial Sectors

Labels / Signs / Decals , Papers & Packagings

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

Phase

Ingredient

Parts by weight

Polyethylene resin (medium viscosity ~8000 cps)

xxxx

Polyterpene tackifier (Piccolyte, Pinova)

xxxx

Polybutene 32 isobutene polymer (Chevron Chemical)

xxx

Tackifier (Piccolastic A-50 , CAS 98-82-8)

xxx

Typical Properties

Properties

The product is activated by heating to about 465°F

Resistant to oxidation and UV light

Good low temperature flexibility

Processing

Resulting Properties

The formulation presented here show properties which make it highly desirable in:

General labeling, and
Packaging applications

Its main application is as a hot melt label coating adhesive that is activated by high temperatures. The Polybutene 32 isobutene polymer acts as a plasticizer and is especially effective in improving low temperature flexibility.

Polyolefins such as polyethylene 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 in the 100°-130°C range. Melt viscosities can have a wide range due to molecular design and additives. Polyolefins are compatible with many tackifiers. Many are also approved by FDA for direct food contact and are oil and water resistant.

(Source: Adhesives Formulary Handbook, NIIR Board, Asia Pacific Business Press, Inc., 2010, p. 335)

Tips and Tricks

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