Aqueous release agent and its use in the production of polyurethane moldings

1 . Aqueous dispersion comprising substantially water, agents having release activity and emulsifiers, wherein said agents include at least a combination of

A) at least one agent having a release activity, selected from the group consisting of soaps, oils, waxes and silicones, and

B) talc.

2 . The aqueous dispersion as claimed in claim 1 , comprising

A) from 0.5 to 40% by weight of said at least one agent having release activity, selected from the group consisting of soaps, oils, waxes and silicones, and

B) from 0.1 to 15% by weight of talc.

3 . The aqueous dispersion as claimed in claim 2 , further comprising

C) from 0.1 to 10% by weight of emulsifiers,

D) from 0.1 to 5% by weight of catalysts,

E) from 0.1 to 5% by weight of foam stabilizers,

F) from 0.1 to 2% by weight of viscosity modifiers,

G) from 0.1 to 2% by weight of customary preservatives, bactericides, fingicides and antioxidants, and

H) water to 100% by weight.

4 . The aqueous dispersion as claimed in claim 1 , wherein the agents A) having a release activity have an average molar mass of greater than 200.

5 . The aqueous dispersion as claimed in claim 1 , wherein at least one compound selected from the group consisting of the liquid, solid, natural or synthetic waxes, oils, esters of carboxylic acids with alcohols or fatty alcohols, metal soaps and silicones is concomitantly used as agents A) having a release activity.

6 . The aqueous dispersion as claimed in claim 1 , wherein said talc B) is an inorganic mineral from the family consisting of the sheet silicates.

7 . The aqueous dispersion as claimed in claim 1 , wherein said talc B) is a talc having a composition of from 35 to 70% by weight of SiO 2 , from 5 to 40% by weight of MgO, from 5 to 20% by weight of Al 2 O 3 and from 1 to 5% by weight of Fe 2 O 3 .

8 . The aqueous dispersion as claimed in claim 1 , wherein said emulsfiers comprise at least one compound selected from the group consisting of the anionic, cationic, zwitterionic and nonionic surfactants.

9 . A method for producing a polyurethane molding comprising adding at least an aqueous dispersion of claim 1 to surfaces of a mold prior to adding a reactive polyurethane system to said mold.

10 . The method as claimed in claim 9 , wherein said mold is heated prior to adding the aqueous dispersion to said mold.

11 . The method as claimed in claim 10 , wherein said mold is heated to a temperature from 45° to 80° C.

12 . The method as claimed in claim 9 , comprising

A) from 0.5 to 40% by weight of said at least one agent having release activity, selected from the group consisting of soaps, oils, waxes and silicones, and

B) from 0.1 to 15% by weight of talc.

13 . The method as claimed in claim 12 , further comprising

C) from 0.1 to 10% by weight of emulsifiers,

D) from 0.1 to 5% by weight of catalysts,

E) from 0.1 to 5% by weight of foam stabilizers,

F) from 0.1 to 2% by weight of viscosity modifiers,

G) from 0.1 to 2% by weight of customary preservatives, bactericides, fingicides and antioxidants, and

H) water to 100% by weight.

14 . The method as claimed in claim 9 , wherein the agents A) having a release activity have an average molar mass of greater than 200.

15 . The method as claimed in claim 9 , wherein at least one compound selected from the group consisting of the liquid, solid, natural or synthetic waxes, oils, esters of carboxylic acids with alcohols or fatty alcohols, metal soaps and silicones is concomitantly used as agents A) having a release activity.

16 . The method as claimed in claim 9 , wherein said talc B) is an inorganic mineral from the family consisting of the sheet silicates.

17 . The method as claimed in claim 9 , wherein said talc B) is a talc having a composition of from 35 to 70% by weight of SiO 2 , from 5 to 40% by weight of MgO, from 5 to 20% by weight of Al 2 O 3 and from 1 to 5% by weight of Fe 2 O 3 .

18 . The method as claimed in claim 9 , wherein said emulsfiers comprise at least one compound selected from the group consisting of the anionic, cationic, zwitterionic and nonionic surfactants.