ABSTRACT
Natural rubber is used as a solution, and manufacture of the pressure-sensitive adhesives implies dissolution of the rubber. Pressure-sensitive adhesives exhibiting low tack, for bonding onto themselves, also are formulated on the basis of masticated natural rubber. Natural raw materials with rubber-like properties and natural resins or plasticizers may be used in order to formulate an adequate recipe. Manufacturing the raw materials means a technical process in order to get the resin in the desired end-use form. Unfortunately, natural resins possess a special chemical structure which is oxidation and polymerization sensitive therefore natural resins have to be modified chemically in order to be stabilized. Synthetic resins are mostly based on hydrocarbons, but derivatives of heterocyclic compounds also are used. Like natural resins, the compounds also can be used in liquid, solvent, or dispersed state. Tackification with high polymers includes tackification with elastomers, viscoelastomers, viscous macro-molecular compounds, and plastomers.
