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The Chemistry of Tackifying Resins - Part I

SpecialChem / Oct 21, 2002

Resins are low molecular weight amorphous polymers. Their main applications are in adhesives, inks, and chewing gum. In adhesives, resins are used to generate tack and specific adhesion. Mostly they are used together with larger polymers, which form the backbone of the adhesive and thus generate cohesion. Formulators use resins to create the best balance between adhesion and cohesion. There are many different resins available to the marketplace. Tackifying resins can be divided into three groups: hydrocarbon resins, rosin resins and terpene resins. Hydrocarbon resins are based on a petroleum feedstock, i.e., a synthetic source, rosin resins are based on a natural feedstock: gained from pine trees and terpene resins are generated from a natural source, wood turpentine or from the kraft sulphate pulping process. Part one of this paper will discuss the chemistry of rosin and terpene resins and their various modified forms. Rosin resins Rosin is one of the oldest raw materials for the adhesives industry, either as such or converted to rosin ester. Three types of rosin are used for resin manufacture, gum rosin, wood rosin and tall oil rosin, all generated from the pine tree.

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