DEBONDABLE COMPACT PU MATERIALS

• Main Author: Cristadoro, Anna Maria
• Format: Patent
• Language: English; French; German
• Published: 20.12.2023
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMISTRY; COMPOSITIONS BASED THEREON; DYES; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF MATERIALS AS ADHESIVES

The present invention is directed to a process for producing a polyurethane having carboxyl groups, said method comprising the steps of providing a polyol composition (PC) essentially consisting of at least one compound (a) bearing at least one carboxyl group or a derivative thereof and at least one functional group comprising active hydrogen reactive towards isocyanate groups; at least one polyol compound (b) having on average 1.5 to 3.5 hydroxyl groups per molecule; optionally one or more further active hydrogen compounds (c) which are different from the compounds (a) and (b); optionally one or more further additives not containing active hydrogens; and then bringing the polyol composition (PC) provided in step (i) into contact with at least one isocyanate composition (IC) comprising at least one isocyanate (11) having on average at least 1.5 isocyanate groups-wherein the NCO group content of the obtained product is in the range of from 0.1 % and 35% by weight. The present invention also relates to the polyurethane obtained in the process as well as the use thereof as an adhesive, as a binder or as a component for the preparation of polyurethanes. According to a further aspect, the present invention relates to a process for preparing a composite comprising at least a first component (C1) and a second component (C2), the process comprising the steps of providing a first component (C1) and a second component (C2), providing a polyurethane obtained or obtainable according to the process of the present invention and bonding the first component and the second component by means of the polyurethane according to the present invention.