Low-Viscosity Phthalates for Flexible Packaging Polyurethane Adhesives
Liquid polyurethane adhesives have been used for laminating flexible films, foils and paper in the flexible packaging industry for over 30 years.
In two-component adhesive systems, it is often imperative that the individual materials of the polyol side remain soluble to avoid separation after mixing and prior to use. Such solubility requirements may restrict the formulation latitude to components that are either soluble in one another or contain a cosolvent to maintain compatibility. While polyether and polyester polyols may each possess a unique set of benefits for an adhesive system, they are often insoluble in one another, creating barriers to simultaneously exploiting the advantages of both types of polyols. A workhorse, or "base," polyol, compatible with either polyether or polyester polyols, would therefore offer the development chemist a broader formulating latitude to meet the diverse demands of various FlexPack markets.