Energy savings plus mechanical reinforcement and rheology control

Metallocene Catalyzed Polyolefin – Mineral Oil HMAs (D)

Adhesives Formulation

Applicable Type

Hot-melt Adhesives

Applicable Base Polymer

Metallocene Catalysts

Applicable Industrial Sectors

Carton side seam (case & carton sealing)

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 polypropylene elastomer

Hydrogenated hydrocarbon resin tackifier

xxxx

Paraffinic mineral oil

Hindered phenol antioxidant (e.g. Irganox 1010, BASF)

xxx

Typical Properties

Properties

Brookfield viscosity at 165°C, cps

xxxx

Peel strength, gm/25mm

xxx

Shear adhesion failure temperature (SAFT), °C

Processing

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Resulting Properties

Naphthenic oils are highly compatible with mPO based hot melt adhesives. The performance of naphthenic oils in both EO and PP formulations is better than paraffinics. Mineral oils have minimal impact on the shear adhesion failure temperature and this property is mainly governed by the type of polymer and tackifier resin.

Higher modulus was observed for formulations with naphthenic oils, which is in-line with the peel adhesion results. In addition, higher wet out and better compatibility was also observed with naphthenic plasticizers. It was shown that the increasing oil content has no effect on the peel adhesion at low add-on levels and has positive impact on the processing properties (e.g. application temperature). Therefore, it is possible to increase the oil content up 20-25% and at the same time decrease the amount of tackifier resin. This would result in cost reduction during processing and on the formulation as well.

The source of Metallocene Catalyzed Polyolefin – Mineral Oil HMAs (B) is Kaali, P. (Nynas), “Mineral Oil Adhesives in Metallocene Hot Melts”, published in Pitture e Vernici European Coatings.