Adhesive Applications
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The two major ingredients of adhesive formulations are the polymer and the
tackifier.
The adhesive polymer provides the overall strength of the formulation, while
the tackifier helps promote adhesion and tack. It also lowers the system
viscosity into a useful working range.
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Formulation Component
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Product
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Attributes
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Adhesive Polymer
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Escorene EVA copolymers
ExxonMobil LDPE
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Cohesive strength, temperature range,
ability to coat
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Tackifier
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Escorez Resins
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Softening point, viscosity, color,
promotes tack
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Modifiers
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Oil
Wax
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--Viscosity, cost, tack
--Viscosity, cost, open/set time
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Antioxidant
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Stability
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The tackifier generally influences the adhesive color, odor and stability. The
selection of a tackifier depends primarily on softening point, composition,
molecular weight and molecular weight distribution. Other modifiers, such as
oils and waxes, are also added primarily to further reduce viscosity. They may
also influence other adhesive properties such as tack, open- and set-time, etc.
Hot melt adhesives are thermoplastic materials, which are mixed and
applied in the molten state at temperatures varying from 120 to 180°C.
Pressure Sensitive Adhesives (PSA) -- can be defined as a substance
capable of holding materials together by instantaneous low pressure surface
contact. Most commonly, a PSA is based on selected elastomers modified to
enhance tackifying and wetting properties
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