Process for producing polyurethanes exhibiting low blooming effects and good low-temperature flexibility on the basis of urethane-containing polymeric hydroxyl compounds

17:

• The process according to claim 16, wherein a totality of the components of the polyol composition (PZ) has an average molecular weight in the range from 500 to 1500 g/mol.

18:

• The process according to claim 16, wherein a totality of the components of the polyol composition (PZ) has an average functionality in the range from 1.7 to 2.3.

19:

• The process according to claim 16, wherein the polyurethane is thermoplastic.

20:

• The process according to claim 16, wherein the prepolymer (PP1) has an average molecular weight in the range from 800 to 5000 g/mol.

21:

• The process according to claim 16, wherein the polyisocyanate (I1) is selected from the group consisting of diphenylmethane 2,2′-, 2,4′- and 4,4′-diisocyanate (MDI), tolylene 2,4- and 2,6-diisocyanate (TDI), hexamethylene diisocyanate (HDI), 1-isocyanato-4-[(4-isocyanatocyclohexyl)methyl]cyclohexane (H12MDI) and naphthalene 1,5-diisocyanate (NDI).

22:

• The process according to claim 16, wherein the polyisocyanate (I2) is selected from the group consisting of diphenylmethane 2,2′-, 2,4′- and 4,4′-diisocyanate (MDI), tolylene 2,4- and 2,6-diisocyanate (TDI), hexamethylene diisocyanate (HDI), 1-isocyanato-4-[(4-isocyanatocyclohexyl)methyl]cyclohexane (H12MDI) and naphthalene 1,5-diisocyanate (NDI).

23:

• The process according to claim 16, wherein the polyisocyanate (I1) is selected from aliphatic polyisocyanates and the polyisocyanate (I2) is selected from aromatic polyisocyanates.

24:

• The process according to claim 16, wherein the chain extender (K1) is selected from the group consisting of diols, diamines and water.

25:

• The process according to claim 16, wherein the reaction in (i) is conducted at a temperature in the range from 40 to 130° C.

27:

• The polyurethane according to claim 26, wherein the prepolymer (PP1) has an average molecular weight in the range from 800 to 5000 g/mol.

28:

• The polyurethane according to claim 26, wherein the polyisocyanate (I1) is selected from aliphatic polyisocyanates and the polyisocyanate (I2) is selected from aromatic polyisocyanates.

29:

• The polyurethane according to claim 26, wherein the polyurethane is thermoplastic.

30:

• A process for production of shaped bodies, adhesives, coatings, hoses, films, nonwoven articles or fibers, comprising employing a polyurethane obtained by the process according to claim 16.