Release agent and use thereof in the production of moulded polyurethane articles

1. An external mold release agent that comprises

A) from 0.5 to 40 wt % of OH-functional polybutadiene, wherein the OH-functional polybutadiene comprises compounds of formula (I),

wherein the units having the index x are present in an average molar fraction based on the sum of the fractions having the indices x, y and z of 17% to 27%, the units having the index y are present in an average molar fraction based on the sum of the fractions having the indices x, y and z of 53% to 63% and the units having the index z are present in an average molar fraction based on the sum of the fractions having the indices x, y and z of 15% to 25% and has an OH number of 20 to 75,

B) from 0.0 to 30 wt % of at least one release-active agent distinct from A and wherein the at least one release-active agent is selected from the group consisting of soaps, oils, waxes or silicones,

C) from 0.1 to 10 wt % of emulsifiers,

D) from 0.1 to 5 wt % of catalysts,

E) from 0.1 to 5 wt % of foam stabilizers,

F) from 0.0 to 5 wt % of viscosity modifiers,

G) from 0.0 to 2 wt % of additives, wherein the additives are selected from the group consisting of cell openers, preservatives, bactericides, fungicides or antioxidants, and

H) solvent ad 100 wt %.

2. The external mold release agent according to claim 1 , wherein as OH-functional polybutadiene the mold release agent comprises OH-functional polybutadiene having an OH number of 30 to 65.

3. The external mold release agent according to claim 1 , wherein the OH-functional polybutadiene

has an OH number of 40 to 60.

4. The external mold release agent according to claim 1 , wherein the external mold release agent further comprises

F) from 0.1 to 5 wt % of viscosity modifiers

and the mold release agent has dry mold residue.

5. The external mold release agent according to claim 1 , wherein the external mold release agent further comprises

G) from 0.1 to 2 wt % of additives selected from the group comprising cell openers, preservatives, bactericides, fungicides or antioxidants.

6. The external mold release agent according to claim 3 , wherein the external mold release agent further comprises

F) 0.1 to 5 wt % of viscosity modifiers,

G) 0.1 to 2 wt % of additives, selected from the group consisting of cell openers, preservatives, bactericides, fungicides or antioxidants.

7. The external mold release agent according to claim 1 , wherein the solvent is water.

8. The external mold release agent according to claim 1 , wherein the solvent is selected from hydrocarbons having a boiling point of 25° C. to 280° C., and flash points greater than 22° C.

9. The external mold release agent according to claim 1 , wherein the OH-functional polybutadiene has a weight-average molar mass of from 3000 to 3500 g/mol.

10. The external mold release agent according to claim 1 , wherein the catalyst D) is a bismuth-comprising catalyst.

11. A molded polyurethane article comprising the external mold release agent according to claim 1 .

12. The external mold release agent according to claim 1 , wherein the solvent is selected from hydrocarbons having a boiling point of from 80° C. to 200° C. and a flash points of greater than 55° C.

13. The external mold release agent according to claim 5 , wherein the OH-functional polybutadiene has an OH number of 30 to 65.

14. The external mold release agent according to claim 6 , wherein the OH-functional polybutadiene has an OH number of 30 to 65.

15. The external mold release agent according to claim 5 , wherein the OH-functional polybutadiene has an OH number of 40 to 60.

16. The external mold release agent according to claim 1 , wherein the OH-functional polybutadiene has an OH number of 40 to 60.

17. The external mold release agent according to claim 5 , wherein the OH-functional polybutadiene has an OH number of 44 to 55.

18. The external mold release agent according to claim 1 , wherein the OH-functional polybutadiene has an OH number of 44 to 55.

19. The external mold release agent according to claim 5 , wherein the OH-functional polybutadiene of formula (I) has a weight-average molar mass of from 3000 to 3500 g/mol.