Tackifiers In Adhesives Teaser

Tackifiers in adhesives (teaser) Dr Evert Smit December 2009

Content • Introduction Arizona Chemical • Tackifiers – Their action – looking at molecular scale – Chemistries – Effect in formulations – DMA • Conclusions

Our company • 10 Manufacturing facilities • Broad-based research and development • Regional headquarters in Jacksonville, Florida and Almere, Netherlands • 2 Research, Development & Technical Service labs – Almere, The Netherlands – Savannah, Georgia US

Sustainability Biorefining- A New Word for our Decades of Experience! Biorefinery: “A facility that integrates biomass conversion processes and equipment to produce fuels, power and added-value chemicals from biomass” Source: Wikipedia Renewable raw Co-product of pulp Refining and Providing sophisticated products material production producing chemicals for the global chemical industry Arizona PULP MILL Chemical

Introduction • What is a tackifier ? • What does it do ? • How does it do this?

Introduction: What is a tackifier ? • Low molecular weight material (resin) (Mn 300-2000) • Compatible or partially compatible with rubber/elastomer or adhesive base polymer • Has a Tg (glass transition temperature) higher than that of the rubber/elastomer or base polymer

Introduction: What does a tackifier do ? • The tackifier modifies the adhesive polymer matrix 1. It (partly) breaks up the existing structure  Enhances the mobility, thus enhances the tack size effect depends on compatibility 2. Increases adhesive force by providing “anchor points” for specific adhesion and bridging – almost like a surfactant – Again, compatibility is key 3. But also increases the Tg of the formulated adhesive (=tackifier+polymer+additives)

Effect depends on amount Example: hotmelt

Tackifying Resins • Types of Tackifying Resins – Chemistry – Characteristics

Tackifying Resins – Types • Rosin derivatives – Pure – Dispersion • Hydrocarbons – C5, C9, C5/C9, AMS • Terpenes – Polymerised – Styrenated – Phenolated

Tackifying resins based on rosin • Bonding – The molecule has 2 distinct areas CH3 • Lipophilic enabling embedding in apolar areas CH3 CH3 • Polar for interaction with the adhesive polymer HO2 C

Tackifying Resins – Hydrocarbon Resins • Chemistry – Aliphatic C5 • cis, trans 1,3-Pentadiene, cyclopentene, cyclopentadiene • -C=C- and –C=C-C=C- functionality • (Non) low polar • ‘like like’ compatibility

Tackifying Resins – Terpenes • Chemistry – Terpene phenols – α-Pinene, β-pinene, d-Limonene + phenol – -C=C- functionality – Aliphatic, polar (-OH) nature

Effect of Tackifiers in Formulations • EVA – Typically packaging & non-woven • Acrylates – Solvent based – Dispersions • Block copolymers – SBS – SIS – … not yet: OBC / metallocenes

Synthetic Rubber Styrene Mid-Block Styrene Styrene End-blocks •Sharp, crystalline melt point •Allows for melt processing •Provides cohesive strength Mid-blocks •Soft, flexible •Elastomeric •Readily tackified

SIS Adhesive Room Temperature Shear 350 300 250 100C polyterpene 200 100C rosin ester minutes 150 C5 hydrocarbon 95C terpene phenol 100 50 0

DMA How to measure the effect of a tackifier and a plasticiser ? • Measure tack, peel and shear performance – Generates real-life numbers Or • Dynamical Mechanical Analysis – Makes molecular interactions visible – Helps to predict adhesive performance and processability

Contact Details Dr Evert Smit Technical Leader Adhesives Arizona Chemical Transistorstraat 16 1322 CE Almere The Netherlands Mobile: +31 653 29 50 32 Office: +31 36 54 62 924 evert.smit@azchem.com http://www.arizonachemical.com

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Tackifiers In Adhesives Teaser

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Tackifiers In Adhesives Teaser — Presentation Transcript