Energy savings plus mechanical reinforcement and rheology control

Metallocene Catalyzed Polyolefin HMA for Heat Sealing Applications (C)

Adhesives Formulation

Applicable Type

Hot-melt Adhesives

Applicable Base Polymer

Metallocene Catalysts

Applicable Industrial Sectors

Flexible packaging: films / films & film / foil laminates , Heat seals

Applicable Base Polymer Properties

Metallocene catalysts have been developed to produce polyolefins with precisely tailored properties. The attributes of metallocene catalyzed polyolefin (mPO) in hot melt adhesives are summarized below:

Increased mileage due to low density
Reduced gel and char formation in tanks, hoses, and nozzles for low maintenance and odor
Reduced stringing and spider webbing
Improved thermal stability and viscosity
Wide service temperature range
Good color / clarity
Clean machining
High adhesion to hard-to-bond substrates
Good compatibility with conventional plasticizing and tackifying agents

The major restraints of metallocene catalyzed polyolefin HMAs are:

The raw material price and,
Formulations are somewhat more difficult to process than conventional hot melts

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

Metallocene catalyzed polyolefin copolymer (Exact 8230, ExxonMobil)

Hydrocarbon tackifier (Regalite S 1100, Eastman Chemical)

Paraffin wax (Sasol wax R2531, Sasol)

Typical Properties

Properties

Brookfield viscosity, mPa-s, at 190°C

xxxxx

Melt stability at 170°C

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Good adhesion to laminates made with

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Processing

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Resulting Properties

Metallocene Catalyzed Polyolefin HMA for Heat Sealing Applications (C) is used to laminate multilayer films. It is suitable in particular for flexible films of polyethylene or polypropylene. The film is suitable for producing packaging and in particular resealable packaging in the food processing industry.

On opening the packaging, the multilayer film is destroyed at the seal point between the film layers and a free layer of permanently tacky pressure sensitive adhesive arises at the container edge. This may be reversibly resealed with the lidding film.

(Source: US Patent 8,076,422, assigned to Henkel, December 13, 2011)