Classification
Based on their differing solubilities within the two distinct phases of ABA-type block copolymer thermoplastic elastomers, commonly used tackifiers are categorized into three groups. The first category typically comprises substances with relatively low solubility parameters; consequently, they are compatible only with non-polar rubber phases and petroleum asphalt phases. This category includes aliphatic and alicyclic petroleum resins, rosin and hydrogenated rosin resins, and terpene resins. These substances serve to reduce the elasticity, modulus, and cohesive strength of self-adhesive modified asphalt, while simultaneously imparting initial tack and peel strength to the material.
Properties
Tackifiers are broadly classified into water-based and oil-based types. Water-based varieties include aqueous tackifier emulsions, aqueous tackifier resins, and aqueous tackifier powders; oil-based varieties include rosin tackifier resins and modified rosin resins.
When utilized in adhesives, the primary function of tackifiers is to enhance the product's initial tack and holding power. When incorporated into coatings, their main purpose is to improve adhesion to the substrate.
