ADHESIVE COMPOSITION BASED ON A POLYESTER URETHANE, AND POLYESTER URETHANE

摘要

The invention relates to a polyester urethane and an adhesive composition produced therefrom. The polyester urethane can be obtained by means of a method comprising the following steps. First, a vicinal diol having at least one secondary hydroxy group, a diisocyanate, and a hydroxycarboxylic acid component are provided. The hydroxycarboxylic acid component is selected from freeα-hydroxycarboxylic acids, freeβ-hydroxycarboxylic acids, and cyclic dimers of theα-hydroxycarboxylic acids. A prepolymer is produced from the hydroxycarboxylic acid component by polycondensation in the presence of a substoichiometric amount of the diol, and at reduced pressure at least at times and in the presence of a catalyst. The prepolymer is then reacted with the diisocyanate such that a reaction of the free hydroxy groups of the prepolymer with the isocyanate groups occurs. The adhesive composition produced therefrom contains a base polymer, which contains said polyester urethane as a main constituent and also a plasticizer and/or a tackifier.