Composite elements composed from thermoplastic polymers and polyurethanes, and process for production thereof

1. A composite element comprising (a) a thermoplastic adhered to (b) a product of the reaction of a reaction mixture consisting of

(i) one or more isocyanates,

(ii) one or more polyester polyols with functionality greater than 3, an ester group concentration of from 9 to 10 mol per 1 kg/polyester polyol, and a hydroxy number of from 60 to 150 mg KOH/g, based on the condensation of adipic acid or adipic acid and isophthalic acid or adipic acid and phthalic acid or adipic acid and isophthalic acid and phthalic acid with ethylene glycol and at least one or more diols from the group consisting of 1,2-propanediol, 1,4-butanediol, and 1,6-hexanediol and trimethylolpropane,

(iii) one or more polyether polyols, and

(iv) optionally a chain extender and/or a crosslinking agent, optionally in the presence of

(v) a catalyst,

(vi) a blowing agent and/or

(vii) an auxiliary and/or an additive.

2. The composite element as claimed in claim 1 comprising, as a thermoplastic (a) one or more plastics selected from the group consisting of polyethylene, polypropylene, styrene-maleic anhydride copolymer (SMA), thermoplastic polyurethane (TPU), polycarbonate (PC), styrene-acrylonitrile (SAN), acrylonitrile-butadiene-styrene (ABS), polyvinylchloride (PVC), and blends thereof.

3. The composite element as claimed in claim 1 , wherein the one or more polyester polyol is a condensate of adipic acid or adipic acid and isophthalic acid and/or phthalic acid with ethylene glycol and 1,2-propanediol and at least one or more diols from the group consisting of 1,4-butanediol and 1,6-hexanediol and trimethylolpropane.

4. The composite element as claimed in claim 1 , wherein the quantitative proportions present of the polyester polyol are from 0.5 to 5% by weight, based on the entirety of components (i) to (vii).

5. The composite element as claimed in claim 1 with an adhesion rolling peel resistance of at least 0.30 N/mm of composite element width measured by a method based on DIN 53 357 A; force per unit of composite element width, between the thermoplastic (a) and the product (b).

6. The composite element as claimed in claim 1 , wherein the amount of ethylene glycol is from 3 to 20% by weight, based on 100 parts by weight of the ester produced, or, if ethylene glycol and propylene glycol are present together, the amount of propylene glycol is from 10 to 30% by weight, based on 100 parts by weight of the ester produced, and the amount of trimethylolpropane is from 5 to 15% by weight, based on 100 parts by weight of the ester produced.

7. The composite element as claimed in claim 1 , wherein the amount of adipic acid is from 60 to 82 mol %, and the amount present of isophthalic and/or phthalic acid is from 18 to 40 mol %.

8. The composite element as claimed in claim 1 , wherein the equivalence ratio of NCO groups from (i) to the entirety of the reactive hydrogen atoms from (ii) and (iii) and optionally (iv) is from 0.3:1 to 1.8:1.

9. A process for producing the composite element as claimed in claim 1 comprising adhering to a thermoplastic (a) a polyisocyanate polyaddition product (b), wherein the polyisocyanate polyaddition product is produced by reaction of a reaction mixture consisting of

(i) one or more isocyanates,

(ii) one or more polyester polyols with functionality greater than 3, ester group concentration of from 9 to 10 mol/kg of ester, and a hydroxy number of from 60 to 150 mg KOH/g, based on the condensation of adipic acid or adipic acid and isophthalic acid and/or phthalic acid with ethylene glycol and at least one or more diols from the group consisting of 1,2-propanediol, 1,4-butanediol and 1,6-hexanediol and trimethylolpropane, (iii) one or more polyether polyols,

(iv) optionally a chain extender and/or a crosslinking agent,

optionally in the presence of

(v) a catalyst,

(vi) a blowing agent and/or

(vii) an auxiliary and/or an

additives in the presence of (a).

10. The process for producing the composite element as claimed in claim 9 , wherein the one or more polyester polyols has an ester group concentration of from 9.2 to 9.8 mol/kg of ester.

11. A method comprising utilizing the composite element as claimed in claim 1 in a component in vehicle construction, aircraft construction, or in the construction industry.

12. A component in vehicle construction or in aircraft construction or in the construction industry comprising the composite element as claimed in claim 1 .