Energy savings plus mechanical reinforcement and rheology control

Styrene Block Copolymer Modified Metallocene Polyolefin HMA

Adhesives Formulation

Applicable Type

Hot-melt Adhesives

Applicable Base Polymer

Metallocene Catalysts , Styrene Block Copolymers, SBC (SBS, SEBS, SEPS, SIS)

Applicable Industrial Sectors

Diaper lamination

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 copolymer (Affinity GA 1900, Dow)

Hydrogenated SEBS styrene block copolymer (Kraton G, Kraton)

Hydrogenated tackifier resin (Escorez 5600, ExxonMobil)

Plasticizer (Benzoflex 352, Eastman Chemical)

Typical Properties

Properties

Brookfield viscosity, cps, at 163°C

xxxx

Processing

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Resulting Properties

Styrene Block Copolymer Modified Metallocene Polyolefin HMA can produce high quality hot melt adhesive that is preferable to EVA or SIS. The mPO based adhesive has low viscosity, fast set speed, superior adhesion and reduced cold flow and/or blocking. The mPO formulation is particularly suited for laminating thin and/or porous substrates such as used in the construction of disposable diapers.

(Source: WO Patent Application 2012/139120, assigned to Bostik, April 9, 2012)

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