Solvent-based adhesives migration from

Migration from water-based adhesives and solvent-based adhesives... 

Lawson et al. (2000) examined the migration of constituents from solvent-free adhesives used to bond 12 pm PET film to 45 pm LDPE. The technique of MALDl-MS, a soft ionisation technique capable of looking at sample mixtures over a mass range of 150-500,000 Da without prior separation, was employed. The adhesives studied were based on a solution of mixed isomers of MDl in polymeric MDI with either polyether or polyester-based polyols. Pouch testing of cured laminates with distilled water was undertaken (two hours at 70 °C) with the LDPE surface in contact with the water. 

Yet the reality can be quite different. Consider the worst case structure in terms of migration time, e.g. OPA/PE. From the first generation of solvent-free laminating adhesives, about 30 years ago to today s adhesive systems based on the smart-cure technology, the total cure time has been reduced significantly. However, a minimum of one week still has to pass before an OPA/PE laminate is ready for use. In general other laminate constructions have shorter migration times. 

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