Properties of pressure sensitive adhesive made of acrylic quaternary copolymers and their blends with vinyl chloride copolymers

Acrylic quaternary copolymers (AQC) were synthesized from copolymerization reaction of 2-ethylhexyl acrylate (2-EHA), n-butyl acrylate (BA), ethyl acrylate (EA) and vinyl acetate (VAc). The blends of AQC with poly(vinyl chloride-co-vinyl acetate) (PVCVAc) and with poly(vinyl chloride-co-vinyl propionate) (PVCVP) were prepared by solution blending. Pressure sensitive adhesive (PSA) properties of AQC and their blends were investigated. Glass transition temperature T-g and holding power of AQC decreases with increasing contents of 2-EHA and BA. Tackiness, however, increases with increasing the contents of 2-EHA and BA. Peel strength shows maximum value for the sample with 15 wt% of those monomers. Tackiness of blend systems is similar, but holding power begins to decrease at 15 wt% or higher PVCVAc contents in AQC+PVCVAc blends. On the other hand, holding power of AQC+PVCVP blends increases as the contents of PVCVP increases. Failure modes of the blend are adhesive except for blends with 5 wt% of PVCVP.