Abstract
The terpenic resins are polymers of low molecular weight hydrocarbons, obtained by cationic polymerization of terpenes. These products are used in the adhesives, sealants and wax coating industries. Commercial adhesive resins are prepared from monoterpenes -the main ones are α-pinene, β-pinene and dipentene. The softening point and molecular weight of polyterpene resins are critical for their main use (adherence). Its adhesive behavior results from the relationship of the softening point with the molecular weight. At the commercial level, polyterpene resins are produced by polymerization of terpene monomers. Batch and continuous systems are used. The composition of an adhesive requires a wide knowledge of the materials available and the specific requirements of its application. The most common types of adhesives are Pressure Sensitive Adhesives, Hot-melt Adhesives and Structural Adhesives.
Highlights
The adhesives are used to join two or more pieces through the contact surfaces
The terpene resins are low molecular weight hydrocarbon polymers prepared by cationic polymerization of terpenes
Chemistry Commercial tackifying resins are prepared from monoterpenes
Summary
Chemistry Commercial tackifying resins are prepared from monoterpenes. The α-pinene, β-pinene and dipentene raw materials are derived from turpentine by fractional distillation. Α-pinene resins The α-pinene is the most difficult of the terpenes to polymerize since it does not possess an exocyclic methylene group It forms the same initial carbenium ion as β-pinene and can attack a second α-pinene. Propagation proceeds with the carbenium ion attack on the exocyclic double bond of another monomer to result in the structure shown in Figure 7 (PESTANA DA SILVA, 1991). These modified polyterpene resins have properties which are a mixture of the hydrocarbon modifier and the terpene, and find specific uses according to the adhesive composition. (ZINKEL, 1989)
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