Polyurethane adhesives

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Polyurethane adhesives are based in reactive chemistry where isocyanates react with polyols and /or water. The high thermal resistance of polyurethanes, including the ability to withstand retort processes, results from chemical crosslinking. This crosslinking is achieved by either using a two-component liquid polyurethane adhesive system or through moisture curing of a one-component reactive polyurethane adhesive. In the case of liquid adhesive systems, solvent can be added to one or both components to reduce their viscosity. One-component polyurethane adhesives can be liquid adhesives or (reactive) hotmelt adhesives.

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