Comparison between thermal crosslinkers based on melamine-formaldehyde and benzoguanamine resin and their influence on main performance of acrylic pressure-sensitive adhesives as tack, peel adhesion, shear strength and pot-life

An acrylic pressure-sensitive adhesive (PSA) was synthesized in ethyl acetate at about 80 degrees C by the use of 2-ethyl-hexyl acrylate, ethyl acrylate, methyl acrylate and acrylic acid at presence of thermal radical initiator AIBN. The synthesized acrylic PSA was crosslinked at relatively low temperatures at about 110-125 degrees C using thermal crosslinkers selected from melamine-formaldehyde resins and benzoguanamine resins. The crosslinking process runs between carboxylic groups of acrylic PSA and reactive groups from investigated amine resins. The choice of suitable thermal reactive crosslinkers has significant and relevant influence at presence of organic acid catalysts on main performance of crosslinked PSA such as tack, peel adhesion and shear strength.