Pressure-sensitive adhesives, PSAs form a bond when a light pressure is applied to bond the adhesive with the adherent. As the name pressure-sensitive implies that the degree of bond and wet-out of adhesive on the substrate is related with the pressure applied. Having both high peel adhesion along with high shear strength is challenging for manufacturers due to the fact that adhesion and cohesion are opposite characteristics to each other, in which the parameters that increase the adhesion decrease the cohesion, and vice versa. The balance between peel adhesion and shear strength may be regulated by the incorporation of chain transfer agents. Thiols (mercaptans) are the most effective chain regulators. However mercaptans have a pungent smell. Manufacturers, end-users and also raw material suppliers are in search of an alternating compound without or less odour to the most common type N-dodecyl mercaptan. 1, 8-dimercapto-3, 6-dioxaoctane, DMDO was introduced into the market as bi-functional and low odor mercaptan by its manufacturer. The purpose of the present study is to investigate the influence of bi-functional chain transfer agent, DMDO at varying amounts on pressure-sensitive adhesive performance and determination of odour level according to VDA 270 test standard. DMDO was incorporated at 0.15, 0.25 and 0.4% s/m ratio into butyl acrylate and acrylic acid copolymer latexes via seeded semi-batch emulsion polymerization procedure. Solid and coagulum content, pH and viscosity were determined and polymer latexes were successfully synthesized. Unreacted monomer content was measured by gas chromatography/mass spectroscopy to reveal the copolymerization. Particle size and particle size measurements were conducted, and molecular weights were determined by Fikentscher K-value equation. With the intended design, pressure-sensitive adhesive performance was investigated depending on the change in molecular weight.