Energy savings plus mechanical reinforcement and rheology control

Metallocene Catalyzed Polyolefin HMA (B) for Hygiene Applications by ExxonMobil

Adhesives Formulation

Applicable Type

Hot-melt Adhesives

Applicable Base Polymer

Polyolefins, Amorphous (APO, APAO)

Applicable Industrial Sectors

Hygiene

Applicable Base Polymer Properties

Metallocene catalysts have been developed to produce polyolefins with precisely tailored properties. The attributes of metallocene catalyzed polyolefin 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
formulations are somewhat more difficult to process than conventional hot melts

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

Metallocene polypropylene (Vistamaxx, ExxonMobil)

Hydrocarbon tackifier (Escorez 5000 series, ExxonMobil)

Typical Properties

Properties

Peel force, gms, after 24 hours

Peel force, gms, after 1 month

Peel force, gms, after 14 days

Processing

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Resulting Properties

Polyolefin hot melt adhesives 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° to 130°C range. Melt viscosities can have a wide range due to molecular design and additives. The formulations Metallocene Catalyzed Polyolefin HMA describe hot melt adhesives for hygienic applications that are based on metallocene catalyzed polyolefin. They are suitable for spray applications.

The source of Metallocene Catalyzed Polyolefin HMA (B) for Hygiene Applicationsis ExxonMobil, “Hot Melt Adhesives Using New Metallocene Propylene Performance Polymers”, October 21, 2014.