| abstract |
In the construction of a multilayer film in which an ethylene-based polymer layer is combined with another layer with a polyurethane (PU) adhesive, the cure rate and degree of cure of the PU adhesive is a functional compound having active hydrogen in the ethylene-based polymer layer A, for example Promoted by incorporating polyols and / or curing catalysts such as amine, zinc or tin-based compounds. The catalyst and reactive functional group may be present on the same molecule (eg, alkoxylated amine or zinc ricinoleate). The catalyst and isocyanate-reactive compound migrate into the PU adhesive over time, accelerating the rate at which the PU adhesive cures, promoting the degree of PU adhesive cure, and the functional compound being the cure catalyst PU adhesive Facilitating the transition in. This accelerated cure then inhibits the transfer of residual monomeric amine from the PU adhesive into the ethylene-based polymer. [Selection] Figure 1 |