Energy savings plus mechanical reinforcement and rheology control

Low Viscosity, High Temperature Metallocene Polyolefin HMA for Lamination (A)

Adhesives Formulation

Applicable Type

Hot-melt Adhesives

Applicable Base Polymer

Metallocene Catalysts

Applicable Industrial Sectors

Laminates

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
Formulations are somewhat more difficult to process than conventional hot melts.

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

Non-crystalline ethylene polyolefin copolymer (Retac 2304, Huntsman)

Metallocene catalyzed ethylene propylene copolymer (Licocene PP2602, Clariant)

Styrene ethylene propylene styrene, SEPS, copolymer (Septon 2063, Kraton)

Hydrogenated hydrocarbon tackifier (Arkon M-100, Arakawa Chemical)

Hydrogenated hydrocarbon tackifier (Maruca Clear-H, Maruzen Petrochemicals, Ltd.)

Antioxidant (Tominox TT, API Corporation)

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Typical Properties

Properties

Brookfield viscosity, cps, at 120° C

xxxxx

Brookfield viscosity, cps, at 140° C

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Brookfield viscosity, cps, at 160°C

xxxx

Peel force, gms, measured at 40°C on nonwoven after spiral spray application at 120° C

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Peel force, gms, measured at 40°C on nonwoven after spiral spray application at 140° C

Peel force, gms, measured at 40°C on nonwoven after spiral spray application at 160° C

xxx

Peel force, gms, after 24 hours

xxx

Peel force, gms, after 1 month

Peel force, gms, after 14 days at 50° C

Processing

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Resulting Properties

The above formulation can produce high quality hot melt adhesive with low viscosity, high softening point, superior heat resistance, and a high degree of adhesive strength and stability at high temperatures. The adhesive is particularly useful for the manufacture of hard to bond articles including laminations.

(Source: US Patent Application 2011/0021102, assigned to Henkel, January 27, 2011.)