AQUEOUS SILVER-CONTAINING NONIONIC POLYURETHANE DISPERSIONS

• US 20090253848A1
• Filed: 06/22/2009
• Published: 10/08/2009
• Est. Priority Date: 04/08/2008
• Status: Abandoned Application

• Current Assignee: Bayer Materialscience AG (Covestro AG)
• Original Assignee: Bayer Materialscience AG (Covestro AG)
• Inventors: Mayer-Bartschmid, Anke, Knezevic, Igor, Koecher, Juergen, Eiden, Stefanie
• Application Number:
  US12/419,536
• Publication Number:
  US 20090253848A1
• Time in Patent Office: Days
• US Class Current: 524/440
• CPC Class Codes: A01N 2300/00 Combinations or mixtures of active ingredients covered by classes A01N27/00 - A01N65/48 with other active or formulation relevant ingredients, e.g. specific carrier materials or surfactants, covered by classes A01N25/00 - A01N65/48
• CPC Class Codes: A01N 25/04 Dispersions, emulsions, suspoemulsions, suspension concentrates or gels foams A01N25/16
• CPC Class Codes: A01N 25/10 Macromolecular compounds
• CPC Class Codes: A01N 59/16 Heavy metals; Compounds thereof
• CPC Class Codes: A61L 2300/104 Silver, e.g. silver sulfadiazine
• CPC Class Codes: A61L 2300/404 Biocides, antimicrobial agents, antiseptic agents
• CPC Class Codes: A61L 2300/606 Coatings
• CPC Class Codes: A61L 2300/624 Nanocapsules
• CPC Class Codes: A61L 27/34 Macromolecular materials
• CPC Class Codes: A61L 27/54 Biologically active materials, e.g. therapeutic substances A61L27/227 takes precedence
• CPC Class Codes: A61L 31/10 Macromolecular materials
• CPC Class Codes: A61L 31/16 Biologically active materials, e.g. therapeutic substances A61L31/047 takes precedence
• CPC Class Codes: C08G 18/12 using two or more compounds having active hydrogen in the first polymerisation step
• CPC Class Codes: C08G 18/283 Compounds containing ether groups, e.g. oxyalkylated monohydroxy compounds
• CPC Class Codes: C08G 18/3228 acyclic
• CPC Class Codes: C08G 18/44 Polycarbonates
• CPC Class Codes: C08G 18/4854 Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
• CPC Class Codes: C08G 18/664 with compounds of group C08G18/3203
• CPC Class Codes: C08G 18/6674 with compounds of group C08G18/3203
• CPC Class Codes: C08G 18/755 and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
• CPC Class Codes: C08G 18/758 : containing two or more cycloaliphatic rings
• CPC Class Codes: C08L 75/04 : Polyurethanes
• CPC Class Codes: C09D 175/04 : Polyurethanes

Abstract

The present invention relates to an aqueous dispersion comprising at least one nonionically stabilized polyurethaneurea and at least one silver-containing constituent.

Claims

1. An aqueous dispersion comprising at least one nonionically stabilized polyurethaneurea and at least one silver-containing constituent.

2. The aqueous dispersion of claim 1, wherein said at least one nonionically stabilized polyurethaneurea comprises a macropolyol synthesis component which is selected from the group consisting of at least one polyester polyol, at least one polyether polyol, at least one polycarbonate polyol, and mixtures thereof.

3. The aqueous dispersion of claim 1, wherein said at least one nonionically stabilized polyurethaneurea comprises a macropolyol synthesis component which is selected from the group consisting of at least one polyether polyol, at least one polycarbonate polyol, and mixtures thereof.

4. The aqueous dispersion of claim 1, wherein said at least one nonionically stabilized polyurethaneurea is synthesized from at least the following synthesis components:

a) at least one macropolyol;

b) at least one polyisocyanate;

c) at least one diamine or amino alcohol;

d) at least one monofunctional polyoxyalkylene ether; and

e) optionally at least one polyol.

5. The aqueous dispersion of claim 1, wherein said at least one silver-containing constituent is a high-porosity silver powder, silver on support materials, or colloidal silver sols.

6. The aqueous dispersion of claim 1, wherein said aqueous dispersion comprises nanocrystalline silver particles with an average size in the range of from 1 to 1000 nm.

7. The aqueous dispersion of claim 1, wherein the amount of silver, based on the amount of solid nonionically stabilized polyurethaneurea polymer and calculated as Ag and Ag , is in the range of from 0.1% to 10% by weight.

8. A process for preparing the aqueous dispersion of claim 1, comprising mixing at least one nonionically stabilized polyurethaneurea dispersion with at least one silver-containing constituent.

9. A process for preparing the aqueous dispersion of claim 4, comprising mixing at least one nonionically stabilized polyurethaneurea dispersion with at least one silver-containing constituent, wherein said at least one nonionically stabilized polyurethaneurea is obtained by:

(I) initially introducing a), b), d), and optionally e) and optionally diluting said constituents with a solvent which is water-miscible but is inert towards isocyanate groups to form a composition;

(II) heating said composition obtained from (I) to a temperature in the range of from 50 to 120°

C.;

(III) metering in any of a), b), d), and optionally e) not added in (I) to form a prepolymer;

(IV) dissolving said prepolymer with the aid of aliphatic ketones; and

(V) chain-extending said prepolymer by reacting it with c).

10. A polyurethaneurea dispersion obtained by the process of claim 8.

11. A coating prepared from the polyurethaneurea dispersion of claim 10.

12. A surface coated with the coating of claim 11.

13. A medical device coated with the coating of claim 11.