The historical development of the polyester‐rubber adhesive Pexul is described. This substance can be used in single‐ or two‐stage dipping in conjunction with a resorcinol‐formaldehyde latex for the adhesion of polyester cords to rubber. The most effective formulation is a molecule consisting of two molecules of resorcinol linked to a central p‐chlorophenol molecule by means of formaldehyde (methylene links), but the commercial product contains many related compounds. Its mode of action is postulated to be (a) adhesion of the substance to the surface of the polyester as a result of good matching of the cohesive energy densities and hydrogen bonding between the polyester oxygen atoms and the phenolic hydroxyls; and (b) thermal polycondensation of the surface film to give a strongly adherent crosslinked film which simultaneously or subsequently reacts with RF‐latex to form a complete system capable of bonding to rubber. The determination of Pexul on dipped cords by chlorine analysis and by the use of trace metals and X‐ray fluorescence is described.
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Jason P. Mather (1971) studied this question.
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