Composite elements made from thermoplastic materials and polyurethanes, method for producing same, and use thereof

#The invention relates to composite elements comprising a thermoplastic and a polyurethane adjoining the latter in adhering fashion, processes for the production thereof and use thereof.

#Polyisocyanate polyaddition products obtainable by reaction of polyisocyanates with isocyanate-reactive compounds as well as composite elements of these products with further plastics are common knowledge. Subjecting these composite elements to mechanical loading often leads to undesirable detachment of the plastics from the polyisocyanate polyaddition products. Particularly when the composite elements used in automotive construction are elements for which such loading cannot be ruled out, detachment of the polyisocyanate polyaddition products from the further plastics and hence destruction of the composite element is not acceptable.

#Furthermore, efforts are made in particular in the automotive industry to use components that are as light as possible, in order to save resources both in the production and in the driving of automobiles, and thus to be able to achieve environmental and economic advantages.

#Determination of the hydroxyl number in accordance with DIN EN ISO 53240-2: Method with catalyst, November 2007 version Determination of the NCO content (Plastics—Polyurethane raw materials)—in accordance with DIN EN ISO 14896 of 2009 Determination of the foam density in accordance with DIN 53420 Determination of the separation force

#The testing is carried out in accordance with the separation test according to DIN 53357. For this purpose, test specimens with a length of 170 mm and a width of 50 mm were produced. Testing velocity: 50 mm/min (the force is determined in accordance with DIN 53357 A; said force per composite element width represents the adhesion (rolling peel resistance)).

#The values reported in Table 1 are reported in parts by weight, unless stated otherwise.