Typical Formulation Ingredients
Phase
Ingredient
Parts by weight
A
Metallocene catalyzed polypropylene elastomer
A
Hydrogenated hydrocarbon resin tackifier
A
Hindered phenol antioxidant (e.g. Irganox 1010, BASF)
Typical Properties
Brookfield viscosity at 165°C, cps
Shear adhesion failure temperature (SAFT), °C
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.