Polyhydroxyfunctional polysiloxane as anti-adhesive and dirt-repellant additives

• US 8,486,188 B2
• Filed: 07/06/2009
• Issued: 07/16/2013
• Est. Priority Date: 07/08/2008
• Status: Active Grant

• Current Assignee: BYK-Chemie GmbH (Susanne Klatten, MBA)
• Original Assignee: BYK-Chemie GmbH (Susanne Klatten, MBA)
• Inventors: Jaunky, Wojciech, Frank, Albert, Bogershausen, Hans-Willi, Griesel, Wolfgang, Valentina, Petra Della, Omeis, Jurgen
• Primary Examiner(s): Loewe, Robert S
• Application Number:
  US13/002,739
• Publication Number:
  US 20110185947A1
• Time in Patent Office: 1,471 Days
• Field of Search: None
• US Class Current: 106/287.14
• CPC Class Codes: C08G 77/38 Polysiloxanes modified by chemical after-treatment C08G77/045 takes precedence
• CPC Class Codes: C08G 77/46 containing polyether sequences

Abstract

The invention relates to a method for production of polyhydroxyfunctional polysiloxanes with branched polyglycidol polyether groups, in which firstly at least one allylic or methallylic starting material is reacted with at least one glycidol, such that an allyl polyether or methallyl polyether is formed, and then the allyl polyether or methallyl polyether thus produced is added to a Si—H functional alkyl polysiloxane in the presence of an acid buffering agent. The invention further relates to polysiloxanes, which may be obtained by said method and the use of the polysiloxanes in coating agents, polymeric coating masses and thermoplastics.

Claims

1. A process for preparing polyhydroxy-functional polysiloxanes comprising branched polyglycidol polyether radicals and having the general formula

2. The process according to claim 1, where the allylic or methallylic starter compound is selected from the group consisting of allyl alcohol, methallyl alcohol, an alkoxylated allyl alcohol or methallyl alcohol, and an allyl alcohol or methallyl alcohol etherified with a diol or polyol.

3. The process according to claim 2, where the alkoxylated allyl alcohol or methallyl alcohol is an ethoxylated, propoxylated or butoxylated or mixedly ethoxylated and propoxylated allyl alcohol or methallyl alcohol, and the diol or polyol is selected from the group consisting of dihydroxylated and polyhydroxylated ethers, esters, polyethers and polyesters.

4. The process according to claim 1, wherein the unbranched allyl polyethers, methallyl polyethers, allyl polyesters and/or methallyl polyesters are subjected to addition reaction with the polysiloxane.

5. The process according to claim 1, wherein unbranched allyl polyethers, methallyl polyethers, allyl polyesters and/or methallyl polyesters in a mixture with, before or after the branched allyl polyethers and/or methallyl polyesters are subjected to addition reaction with the polysiloxane.

6. The process according to claim 1, where the addition reaction of the allyl polyethers or methallyl polyethers with the Si—

H-functional alkyl-polysiloxane is carried out in the presence of a solvent which allows homogeneous dissolution both of the allyl polyethers or methallyl polyethers and of the Si—

H-functional alkyl-polysiloxane in the reaction mixture.

7. The process for preparing branched polysiloxanes comprising polyglycidol-polyether radicals, wherein the polyhydroxy-functional polysiloxanes obtained by the process of claim 1 are modified by alkoxylation, esterification, etherification and/or urethanization of at least some of the hydroxyl groups.

8. A Polysiloxane prepared according to claim 1.

9. A polysiloxane according to claim 8, wherein the at least one branched polyhydroxy-functional allyl polyether or methallyl polyether has a dendritic structure.

10. A polysiloxane according to claim 8, wherein the alkylpolysiloxane is a methylhydrogenpolysiloxane.

11. A polysiloxane according to claim 8, wherein it is composed of 10 to 100 siloxane units.

12. A polysiloxane according to claim 8, wherein C is 0, and at least one of the groups R² and R³ is a radical R.

13. A polysiloxane according to claim 8, wherein only one of the groups R² and R³ is a radical R.

14. A method of making coating compositions, polymeric moulding compounds or thermoplastic having anti-adhesive and/or dirt repellent action comprising adding 0.1% to 5% by weight of a polysiloxane prepared according to the process of claim 1 as an additive in coating compositions, polymeric moulding compounds or thermoplastics.

15. A coating composition, polymeric moulding compound or thermoplastic comprising a polysiloxane prepared according to the process of claim 1.

16. A coating composition or polymeric moulding compound containing 0.1%-10% by weight, of a polysiloxane prepared by the process of claim 1.

17. A thermoplastic composition containing 0.1%-5% by weight, of a polyhydroxy-functional polysiloxane prepared according to the process of claim 1.