Energy savings plus mechanical reinforcement and rheology control

Oil Resistant Polyvinyl Butyral Hot Melt Adhesive

Adhesives Formulation

Applicable Type

Hot-melt Adhesives

Applicable Industrial Sectors

Buildings & constructions

Applicable Base Polymer Properties

Polyvinyl acetal adhesives generally are formulated from either polyvinyl butyral or polyvinyl formal resins. The polyvinyl butyral is much more soluble and has a lower melt viscosity. It is a more flexible polymer and provides better peel strength. Polyvinyl butyral adhesives are supplied as hot melt adhesives or as solvent solutions of high viscosity and low solids content. These adhesives are water white and transparent, light stable, and have excellent adhesion to glass. Polyvinyl butyral is commonly used in laminating safety glass.

Typical Formulation Ingredients

Ingredient

Parts by weight

Polyvinyl butyral resin (low hydroxyl content)

xxxxxx

Plasticizer (2-ethylhexyl diphenyl phosphate)

xxxxx

Tackifier (modified rosin with ring and ball softening point of 60°C)

xxxxxxx

Amide resin (Armid HT, AkzoNobel)

xxx

Wax (Castowax additive, NL Industries Inc.)

xxxxxxx

(Source: Adhesives Formulary Handbook, NIIR Board, Asia Pacific Business Press, Inc., 2010,

Typical Properties

Properties

• Improved oil and grease resistance

• Excellent flow and spreading

• Sharp melting point and quick setting

• Overall low cost

Processing

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Resulting Properties

Polyvinyl butyral provides an excellent base polymer for hot melt adhesives. Adhesion is good to all substrates including low energy plastics. This formula can be used for adhering or coating numerous surfaces. Such properties as specific adhesion, flow, melt temperature, setting time, etc. can be widely varied using the concentration ranges given in the formula above.