Evaluation of Epoxidized Natural Rubber Latex Based Pressure Sensitive Adhesives Containing Hydrocarbon and Rosin Ester Tackifier Dispersions on Adhesive Properties
Epoxidized natural rubber latex with 50 mole % epoxidization referred to as ENR50 L was produced by in situ generated peracids. ENR50 L was subsequently concentrated to ENR50 L concentrate (ENR50 LC)viaultrafiltration membrane separation process. Both, ENR50 Latices (ENR50 L and ENR50 LC) were evaluated for the formulation of latex-based pressure sensitive adhesives (PSAs). In this work, evaluation of hydrocarbon and rosin ester tackifier dispersions in ENR50 Latices - based PSAs were performed through viscosity and peel adhesion test. The viscosity of latex-based PSAs containing hydrocarbon tackifier increased with increasing level of ENR50 Latices. However, the trend for latex-based PSAs containing rosin ester tackifier was inversely proportional to the level of ENR50 Latices. The peel adhesion of ENR50 Latices - based PSAs containing hydrocarbon tackifier was found greater than that of ENR50 Latices based PSAs containing rosin ester tackifier. Furthermore, the peel adhesion of ENR50 LC based PSAs was marginally higher than ENR50 L based PSAs.