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

• US 20070110840A1
• Filed: 10/26/2006
• Published: 05/17/2007
• Est. Priority Date: 11/12/2005
• Status: Active Grant

• Current Assignee: Evonik Degussa GmbH
• Original Assignee: Evonik Goldschmidt GmbH (Rag-Stiftung)
• Inventors: Henning, Torsten, Althoff, Ralf, Lammerting, Helmut
• Granted Patent: US 7,811,502 B2
• Time in Patent Office: Days
• US Class Current: 425/522
• CPC Class Codes: B29C 33/60 Releasing, lubricating or separating agents in general C10M
• CPC Class Codes: B29C 33/62 based on polymers or oligomers
• CPC Class Codes: B29C 33/64 Silicone
• CPC Class Codes: C10M 173/02 not containing mineral or fatty oils
• CPC Class Codes: C10M 2205/026 Butene
• CPC Class Codes: C10M 2205/06 containing conjugated dienes
• CPC Class Codes: C10M 2205/14 Synthetic waxes, e.g. polythene waxes
• CPC Class Codes: C10M 2205/16 Paraffin waxes; Petrolatum, e.g. slack wax
• CPC Class Codes: C10M 2207/122 monocarboxylic
• CPC Class Codes: C10M 2209/104 of alkylene oxides containing two carbon atoms only
• CPC Class Codes: C10M 2209/108 etherified
• CPC Class Codes: C10M 2215/04 having amino groups bound to acyclic or cycloaliphatic carbon atoms
• CPC Class Codes: C10M 2229/047 containing alkylene oxide groups
• CPC Class Codes: C10N 2040/36 Release agents or mold release agents

Abstract

The invention relates to aqueous dispersions containing agents having release activity, emulsifiers and customary auxiliaries and additives, wherein 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) polyisobutylene is used as agents having release activity.

Claims

1. An aqueous dispersion comprising substantially water, agents having release activity, and emulsifiers, wherein said agents comprise 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) polyisobutylene.

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 said polyisobutylene.

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

C) from 0.1 to 10% by weight of said 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 5% by weight of viscosity modifiers,

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

H) said 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 greater than 200.

5. The aqueous dispersion as claimed in claim 1, wherein at least one compound selected from the group consisting of 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 the liquid polyisobutylene having a molar mass of from 200 to 3000 is used as polyisobutylene B).

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

8. 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.

9. The method as claimed in claim 8, wherein said mold is heated prior to adding the aqueous dispersion to said mold.

10. The method as claimed in claim 9, wherein said mold is heated to a temperature from 450 to 80°

C.

11. The method as claimed in claim 8, comprising 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 from 0.1 to 15% by weight of said polyisobutylene.

12. The method as claimed in claim 11, further comprising

C) from 0.1 to 10% by weight of said 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 5% by weight of viscosity modifiers,

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

H) said water to 100% by weight.

13. The method as claimed in claim 8, wherein the agents A) having a release activity have an average molar mass greater than 200.

14. The method as claimed in claim 8, wherein at least one compound selected from the group consisting of 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.

15. The method as claimed in claim 8, wherein the liquid polyisobutylene having a molar mass of from 200 to 3000 is used as polyisobutylene B).

16. The method as claimed in claim 8, wherein at least one compound selected from the group consisting of anionic, cationic, zwitterionic and nonionic surfactants is used as said emulsifier.