Energy savings plus mechanical reinforcement and rheology control

Hot Melt Polyisobutene Pressure Sensitive Adhesive

Adhesives Formulation

Applicable Type

Hot-melt Adhesives

Applicable Base Polymer

Polyisobutylenes (PIB)

Applicable Industrial Sectors

Buildings & constructions , Electrical & Electronic Bonding

Applicable Base Polymer Properties

PIB has long been used as a basic substance in the compounding of pressure-sensitive adhesives (PSAs). Relative to other known elastomers, synthetic polymers based on isobutylene offer a number of advantages. Owing to their synthetic production, they are free of unwanted ingredients and due to their complete saturation they are highly stable to oxidation. PIBs are not a skin irritant and adhesives used in medicine (e.g., surgical tape adhesive, transdermal systems) are usually based on PIBs.

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

Copolymer of isobutylene and isoprene (Exxon 065, ExxonMobil)

xxx

Tackifying resin (Escorez 5320, ExxonMobil)

Petrolatum

Amber microwax (BeSquare 175, New Phase Technologies)

xxx

Antioxidant (Irganox 1010, BASF)

Typical Properties

Properties

Good adhesion to a variety of surfaces

Excellent durability and water resistance

Good package stability and adhesion

Will withstand cyclic joint movement

Processing

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Resulting Properties

A typical isobutene hot melt compound has the composition as shown above. Isobutene adhesives are known for excellent adhesion to most substrates and good water resistance. However, they can stain adjacent surfaces and have relatively poor recovery from extension. The polymeric compositions along with the other additives will affect both the application and the ultimate performance properties of the joint.

(Source: Willenbacher, N., Chapter 4 in Technology of Pressure Sensitive Adhesives and Products, p. 4.7)