ADHESION PROMOTER FOR ADHESIVE COMPOSITES COMPOSED OF PLASTIC AND OF A POLYISOCYANATE POLYADDITION PRODUCT

摘要

The present invention relates to composite elements comprising (i) plastic, adhering to which there is (ii) a polyisocyanate polyaddition product, where the polyisocyanate polyaddition product is obtained by mixing (a) isocyanate with (b) compounds having groups reactive toward isocyanates, (c) catalysts, (d) if desired, blowing agent, and (e) if desired, further additives, to give a reaction mixture, and permitting the reaction mixture to complete its reaction to give the polyisocyanate polyaddition product, where the compounds (b) having groups reactive toward isocyanates comprise a polyester polyalcohol as adhesion promoter, which can be prepared by polycondensation of an acid component and of one or more low-molecular-weight diols whose molecular weight is less than 500 g/mol, in excess, where the acid component comprises 83 to 97 mol% of adipic acid and 3 to 17 mol% of phthalic acid, isophthalic acid and/or terephthalic acid. The present invention further relates to composite elements comprising (i) plastic, adhering to which there is (ii) a polyisocyanate polyaddition product, where the polyisocyanate polyaddition product is obtained by mixing (a) isocyanate with (b) compounds having groups reactive toward isocyanates, (c) catalysts, (d) if desired, blowing agent, and (e) if desired, further additives, to give a reaction mixture, and permitting the reaction mixture to complete its reaction to give the polyisocyanate polyaddition product, where the compounds (b) having groups reactive toward isocyanates comprise a polyester polyalcohol as adhesion promoter, preparable by polycondensation of an acid component and one or more low-molecular-weight diols having a molecular weight of less than 500 g/mol, in excess, the low-molecular-weight diols containing 5 to 66 mol% of 1,3-propanediol, based on the total amount of the diol. The present invention also relates to a process for the production of these composite elements, and to components in the fitting-out of aircraft, of vehicles, or of buildings, and to insulation systems comprising this type of composite element.