TPVs cured with conventional phenolic resins often stain painted surfaces, when
in contact. This has resulted in the exclusion of TPVs cured with phenolic resins in many
applications where the elastomer will have extended contact with a painted surface such
as the body of cars, structural moldings and glass to metal laminates. When the
phenolic resin curatives are esterified (e.g., acetylated, tosylated, silylated or
phosphorylated) before use as a curative, the amount of staining is reduced or even
eliminated.