METHOD FOR THE MANUFACTURE OF BLOCKED POLYURETHANE IMPACT RESISTANCE MODIFIERS TO IMPROVE THE IMPACT STRENGTH OF SINGLE-COMPONENT EPOXY ADHESIVES

摘要

method of producing a schlagzu00e4higkeitsmodifikators which an isocyanate - scheduled polymer.the isocyanatgruppen by reaction with a blockierungsmittel partially or completely blocked, fully the steps:(a) the addition of a mixture of fully(a) two or more polyols a1 and a2) fully polytetramethylenetherglycol) at least one hydroxyterminiertes polybutadiene.although the total proportion of polytetramethylenetherglycol and hydroxy terminiertem polybutadiene and at least 95 wt.%, based on the total weight of the polyols isand (b) at least one acyclic aliphatic or cycloaliphatic polyisocyanatand (c) at least one blockierungsmittel selected from the group consisting of phenol, 2 benzoxazolinonen and pyrazolen,(d) at least one catalyst k1 and subsequently (b) addition of at least one catalyst k2.in formation of the partially or completely blocked isocyanatterminierten polymers.;the invention also relates to the procedures contained in this schlagzu00e4higkeitsmodifikatoren, their use, and the schlagzu00e4higkeitsmodifikatoren containing epoxidharzformulierungen.