Aqueous polyorganosiloxane hybrid resin dispersion

Patent metadata

Field	Value
Publication number	US-12404407-B2
Application number	US-202418587297-A
Country	US
Kind code	B2
Filing date	Feb 26, 2024
Priority date	Apr 1, 2019
Publication date	Sep 2, 2025
Grant date	Sep 2, 2025

Abstract

A process for producing an aqueous polyorganosiloxane hybrid resin dispersion includes emulsifying a polyorganosiloxane hybrid resin solution of a polyorganosiloxane hybrid resin and an organic or semi-organic solvent with an emulsifier solution that includes at least one emulsifier based on a partly hydrolysed polyvinylacetate and removing the organic or semi-organic solvent.

First claim

The invention claimed is:

1. A process for producing an aqueous polyorganosiloxane hybrid resin dispersion, comprising:
a) emulsifying
a polyorganosiloxane hybrid resin solution, comprising a polyorganosiloxane hybrid resin and an organic solvent, with
water and an emulsifier solution or an aqueous emulsifier system, comprising at least one emulsifier comprising a partly hydrolysed polyvinylacetate, and

b) removing the organic solvent by at least one process selected from the group consisting of distillation under reduced pressure with or without stripping gas, steam distillation, a membrane process, evaporation with a thin-film evaporator, and a counter-current process.

2. The process according to claim 1 , wherein the emulsifier solution or an aqueous emulsifier system solution has a concentration of said at least one emulsifier between 5-40% by weight based on the emulsifier solution or aqueous emulsifier system.

3. The process according to claim 1 , wherein water is additionally added in a).

4. The process according to claim 1 , wherein a solids content for the aqueous polyorganosiloxane hybrid resin dispersion is adjusted after b).

5. The process according to claim 1 , wherein the polyorganosiloxane hybrid resin comprises a reaction product of a composition, comprising:
component A) 5 to 95 parts by weight of one or more polyorganosiloxanes of the general formula
R a Si(OR′) b O (4-a-b/2)   formula (I)

wherein 0<a<2, 0<b<2 and a+b<4,
and
component C) 5 to 95 parts by weight of at least one organic polymer,
wherein R and R′ are each independently an alkyl radical having 1 to 8 carbon atoms or an aromatic radical having 6 to 20 carbon atoms.

6. The process according to claim 5 , wherein the organic polymer comprises organic polymers containing hydroxyl groups.

7. The process according to claim 1 , wherein the at least one emulsifier is the partly hydrolysed polyvinylacetate having an alcoholysis level between 10% 99% (mol/mol).

8. The process according to claim 1 , wherein the partly hydrolysed polyvinylacetate has a viscosity, measured in a 4% aqueous polyvinylacetate solution at 20° C. to DIN 53015, of 1-50 mPa s.

9. The process according to claim 1 , wherein the emulsifier solution further comprises an additional emulsifier, selected from the group consisting of anionic, cationic, zwitterionic, nonionic emulsifiers, and mixtures thereof.

10. The process according to claim 1 , wherein the organic solvent is at least one organic solvent that has been used in a preparation of the polyorganosiloxane hybrid resin.

11. The process according to claim 1 , wherein the organic solvent or mixtures thereof has a boiling point range of 50° C.-150° C.

12. The process according to claim 1 , wherein the polyorganosiloxane hybrid resin solution has a polyorganosiloxane hybrid resin concentration of 40.0% 95.0% by weight, based on the polyorganosiloxane hybrid resin solution.

13. The process according to claim 1 , said aqueous polyorganosiloxane hybrid resin dispersion has a hybrid resin content of at least 45.0 wt. %.

14. The process according to claim 1 , said aqueous polyorganosiloxane hybrid resin dispersion has a hybrid resin content of at least 55.0 wt. %.

15. The process according to claim 1 , wherein said organic solvent is at least one solvent selected from the group consisting of a methyl ethyl ketone, acetone, methyl isobutyl ketone, diethyl ketone, methyl propyl ketone, cyclohexanone, methylcyclohexanone, ethyl acetate, butyl acetate, ethyl propionate, isobutyl acetate, tert-butyl acetate, ethylene carbonate, propylene carbonate, glycerol carbonate, xylene, cyclohexane, dibutyl ether, methoxypropyl acetate, hexamethyldisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane and tetramethylgermanium.

Assignees

• Evonik Operations Gmbh

Inventors

• Seyfried Mona
• Silber Stefan
• De Gans Berend-Jan
• Fiedel Michael
• Hallack Markus

Classifications

• C09D183/04

  Polysiloxanes · CPC title

• C09D167/025

  containing polyether sequences · CPC title

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• C08L2201/54

  Aqueous solutions or dispersions · CPC title