Plastisol composition for seam and underbody sealants

摘要

A plastisol composition comprises (i) pulverulent polymer of polyvinyl chloride or polyacrylate (ii) a plasticizer of a citric acid ester of formula I, and (iii) amino- and/or amido-functional compounds and/or blocked polyurethanes as reactive additives. The citric acid esters act as a plasticizer and provide plastisols with moderate curing temperatures that confer good adhesion results when applied to organically coated metal substrates. The plastisol compositions of the underlying invention are especially useful for sealants and underbody coatings in the automotive industry. The preferred citrates are acetyl tri-butyl citrate or acetyl tri(2-ethylhexyl) citrate. The PVC may additionally contain a PVC copolymer formed with vinyl acetate, styrene or (alkyl)(meth)acrylates. Formula I: wherein R1 is H or C1-5, and R2-R4 are independently C2-9 alkyls.