POLYHYDROXYFUNCTIONAL POLYSILOXANE AS ANTI-ADHESIVE AND DIRT-REPELLANT ADDITIVES IN COATINGS POLYMERIC MOULDED MASSES AND THERMOPLASTICS, METHOD FOR PRODUCTION AND USE THEREOF

• US 20110185947A1
• Filed: 07/06/2009
• Published: 08/04/2011
• 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: Bogershausen, Hans-Willi, Frank, Albert, Jaunky, Wojciech, Della Valentina, Petra, Omeis, Jurgen, Griesel, Wolfgang
• Granted Patent: US 8,486,188 B2
• Time in Patent Office: Days
• 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. Process for preparing polyhydroxy-functional polysiloxanes comprising branched polyglycidol polyether radicals, characterized in that first at least one allylic or methallylic starter compound is reacted with at least one glycidol or glycidol carbonate such that an allyl polyether or methallyl polyether modified with one or more branched polyglycidol radicals is formed, and then the allyl polyether or polyethers or methallyl polyether or polyethers thus prepared is or are subjected to addition reaction with an Si—

H-functional alkyl polysiloxane in the presence of an acid-buffering agent.

2. 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. 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. Process according to one of claims 1 to 3, characterized in that subsequently unbranched allyl polyethers, methallyl polyethers, allyl polyesters and/or methallyl polyesters are subjected to addition reaction with the polysiloxane.

5. Process according to one of claims 1 to 3, characterized in that 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. Process according to one or more of claims 1 to 5, 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. Process for preparing branched polysiloxanes comprising polyglycidol-polyether radicals, characterized in that the polyhydroxy-functional polysiloxanes obtained by the processes of claims 1 to 6 are modified by alkoxylation, esterification, etherification and/or urethanization of at least some of the hydroxyl groups.

8. Polysiloxane characterized in that it is obtainable according to one or more of claims 1 to 7.

9. Polysiloxane according to claim 8, characterized in that the at least one branched polyhydroxy-functional allyl polyether or methallyl polyether has a dendritic structure.

10. Polysiloxane according to claim 8 or 9, characterized in that the alkylpolysiloxane is a methylhydropolysiloxane.

11. Polysiloxane according to one of claims 8 to 10, characterized in that it can be represented by the general formula

12. Polysiloxane according to claim 11, characterized in that it is composed of 10 to 100 siloxane units, preferably of 20 to 80 siloxane units, more preferably of 30 to 70 siloxane units.

13. Polysiloxane according to claim 11 or 12, A and C being 0, and at least one of the groups R² and R³ being a radical R.

14. Polysiloxane according to claim 11 or 12, exactly one of the groups R² and R³ being a radical R.

15. Use of a polysiloxane according to one of claims 8 to 14 or prepared according to a process according to claims 1 to 7 as an additive in coating compositions, polymeric moulding compounds or thermoplastics.

16. Coating composition, polymeric moulding compound or thermoplastic comprising a polysiloxane according to one of claims 8 to 14 or prepared according to a process according to claims 1 to 7.

17. Coating composition or polymeric moulding compound containing 0.1%-10% by weight, preferably 0.5%-7.5% by weight, more preferably 1%-5% by weight of a polysiloxane according to one of claims 8 to 14 or prepared according to a process according to claims 1 to 7.

18. Thermoplastic containing 0.1%-5% by weight, preferably 0.2%-2% by weight, more preferably 0.5%-1% by weight of a polyhydroxy-functional polysiloxane according to one of claims 8 to 14 or prepared according to a process according to claims 1 to 7.