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The Chemistry of Tackifying Resins - Part II

SpecialChem / Nov 11, 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 two of this paper will discuss the chemistry of hydrocarbon resins (C5 aliphatic, C9 aromatic, Dicyclopentadiene and Hydrogenated Hydrocarbon Resins). Hydrocarbon resins There are three major types of hydrocarbon resins: * C5 aliphatic resins * C9 aromatic resins * DCPD cycloaliphatic resins ( dicyclopentadiene)

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