Professional Polymer Technology
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Preferably a non-hardening PUR adhesive compound is use […]
Preferably a non-hardening PUR adhesive compound is used as the non-reacting mass of the cleaning composition. Polyol polymers, in particular polyesters, polyethers, polyester esters and polyester polyether colypolmers, are suitable as starting material for this purpose.
After complete stoichiometrical saturation of the hydroxyl functions of the polyol polymer e.g. with a monofunctional isocyanate compound, a monohydroxy functional compound with NCO reactive properties is added as a second component, preferably in amounts of 10 to 100 milli-equivalents (based on 100 g of total compound).
During use of the cleaning composition, this NCO reactive mono hydroxy functional component completely saturates or neutralizes the remaining isocyanate groups of the polyurethane hot melt adhesive to be removed, turning the latter into a non reactive, soluble end product.
As an alternative, the non-reacting mass can be formed from a moisture-reactive hot melt adhesive similar to the PUR hot melt adhesive to be removed, the NCO functionality of the former being fully stoichiometrically saturated with a mono hydroxy functional compound in this case, too, a content of in particular 10 to 100 milli-equivalents (based on 100 g of total compound) of a monohydroxy functional compound is additionally provided as the NCO reactive component, which completely saturates the residual NCO functionality of the PUR hot melt adhesive to be cleaned and removed, and converts the adhesive into a non-reactive soluble form.