ABSTRACT
Resins or in situ resins are considered to be polymeric materials with weightaverage molecular weights (Mw) in the approximate range of 800-4000. They are amorphous, thermoplastic materials that can be either liquids (low softening points) or solids (high softening points). They serve many functions in rubber compounds. In uncured rubbers they function as process aids, softeners, tackifiers, pigment dispersing aids, and homogenizing agents. In cured rubbers they function as plasticizers, extenders, and reinforcing agents.
