| abstract |
The adhesive is mainly used in the footwear industry, particularly in the case of glue application machines integrated in a shoe production line that does not contain a pre-wetting / cross-linking / steaming and drying channel. It has increased strength and creep strength at high initial and ultimate strength and is preferably produced in a one-step process. The adhesive comprises at least one polyurethane prepolymer of at least one polyisocyanate, especially toluene isocyanate and / or MDI, at least one polyalkylene glycol at a concentration above 10% by weight. relative to the total volume of the melt adhesive, especially polypropylene glycol, at least one polyesterglycol, preferably at least two polyesterglycol having a different glazing temperature. Adhesives also contain optional additives such as a resin, especially a hydrocarbon, and a stabilizer such as toluenesulfonyl isocyanate. Preferably, the melt adhesive has a melt viscosity of 10 to 300 Pa at 1300C. The polyurethane polymer has only one Tg in the DSC chart. |