Bonding of vulcanized rubber to polyester cord using RFL adhesives modified with chlororesorcinolic resin

A typical resorcinol/formaldehyde/latex (RFL) adhesive and two modified versions were used to bond a tire body stock (NR/SBR/BR blend) to polyethylene terephthalate (PET) cord. Modifications contained a commercial chlorophenol/resorcinol condensate or a lab-prepared chlororesorcinol/resorcinol condensate (CRA). Standard H-test specimens were prepared by embedding adhesive-coated, heat-treated cords into the rubber and then vulcanizing. The effect of heat treatment time and overcure on pull-out adhesion was studied. Overcure conditions were used to simulate long service. Pull-out forces increased with longer heat treatment and decreased with overcure. The CRA-modified adhesive gave the highest pull-out forces after overcure. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91:1993–1996, 2004