Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Tackifiers are chemical compounds used in formulating adhesives to increase the tack, the stickiness of the surface of the adhesive. They are usually low-molecular weight compounds with high glass transition temperature. At low strain rate, they provide higher stress compliance, and become stiffer at higher strain rates. Tackifiers tend to have low molecular weight, and glass transition and softening temperature above room temperature, providing them with suitable viscoelastic properties. Tackifiers frequently present most of both weight percentage and cost of hot melt adhesives and pressure sensitive adhesives. In hot melt adhesives they can comprise up to about 40% of total mass.

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