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Hot Melt Polyurethane Reactive Adhesives Targeted for Specific Applications

SpecialChem / May 29, 2002

Although hot melt polyurethane reactive (HMPUR) adhesives have been available for 25 years, their novel properties and the development of diverse products have accelerated their recent growth. They are now found in many applications as products are developed to fit specific needs. In general, HMPUR adhesives have these characteristics: * They are solid at room temperature, similar to other hot melt adhesives that are thermoplastic polymers, such as ethylene vinylacetate (EVA), polyalphaolefin (PAO), polyester and polyamide. * The temperature for application as a melt ranges from 85°C to 140°C (185°F to 284°F), which is less than that for typical thermoplastic hot melt products. The viscosity at the application temperature can be designed in a range from 2,000 to 60,000 cPs depending on the specific requirements. * HMPUR adhesives are being produced with open times varying from 10 seconds to 10 minutes to match application requirements. * The unique property that gives HMPUR adhesives their performance advantage compared to thermoplastic hot melts is that they cure to a thermoset material that resists melting.

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