Composition for production of coatings having an antimicrobial property

Patent metadata

Field	Value
Publication number	US-11713400-B2
Application number	US-202117176922-A
Country	US
Kind code	B2
Filing date	Feb 16, 2021
Priority date	Feb 18, 2020
Publication date	Aug 1, 2023
Grant date	Aug 1, 2023

Abstract

A curable composition for production of coatings with an antimicrobial property contains at least one film-forming polymer, at least one up-conversion phosphor, optionally, at least one additive, and optionally, at least one curing agent. The phosphor is selected from the idealized general formula (I), A1-x-y-zB*yB2SiO4:Ln1x,Ln2z,, where x=0.0001-0.05, z=0 or z=0.0001 to 0.3, and y=x+z; A is selected from Mg, Ca, Sr, and Ba; B is selected from Li, Na, K, Rb, and Cs; B* is selected from Li, Na, and K; where B is the same as B* or B is not the same as B*, and B and B* are preferably not the same; Ln1 is selected from praseodymium (Pr), erbium (Er), and neodymium (Nd); and Ln2 is optionally selected from gadolinium (Gd).

First claim

The invention claimed is:

1. A curable composition for production of coatings with an antimicrobial property, the composition comprising:
at least one film-forming polymer,
at least one up-conversion phosphor,
optionally, at least one additive, and
optionally, at least one curing agent,
wherein the at least one up-conversion phosphor is selected from the formula (I)
A 1-x-y-z B* y B 2 SiO 4 :Ln 1 x, Ln 2 z,   (I)

wherein
x=0.0001-0.05, z=0 or z=0.0001 to 0.3, and y=x+z,
A is selected from Mg, Ca, Sr, and Ba,
B is selected from Li, Na, K, Rb, and Cs,
B* is selected from Li, Na, and K,
where B is the same as B* or B is not the same as B*,
Ln 1 is selected from the group consisting of praseodymium, erbium, and neodymium, and
Ln 2 is optionally gadolinium.

2. The composition according to claim 1 , wherein the at least one phosphor has been doped with praseodymium.

3. The composition according to claim 1 , wherein the at least one phosphor has been doped with praseodymium and co-doped with gadolinium.

4. The composition according to claim 1 , wherein the at least one phosphor is a solidified melt composed of crystalline silicates or of crystalline silicates doped with lanthanoid ions, comprising at least one alkali metal ion and at least one alkaline earth metal ion.

5. The composition according to claim 1 , wherein the at least one phosphor is selected from the formula (Ia)
A 1-x-y-z B* y B 2 SiO 4 :Pr x, Gd z,   (Ia)

wherein
A=Mg, Ca, Sr, or Ba,
B=Li, Na, K, Rb, or Cs,
x=0.0001-0.05, z=0 or z=0.0001 to 0.3, and y=x+z,
B* is selected from Li, Na, and K, which serve to balance the charge of the silicates, and
where B is the same as B* or B is not the same as B*.

6. A curable composition for production of coatings with an antimicrobial property, the composition comprising:
at least one film-forming polymer,
at least one up-conversion phosphor,
optionally, at least one additive, and
optionally, at least one curing agent,

wherein the at least one phosphor is selected from the formula (II)
(Ca 1-a Sr a ) 1-2b Ln b Na b Li 2 SiO 4   (II)

wherein
a=0.0001 to 1,
b=0.0001 to 1,
Ln=a lanthanoid ion selected from the group consisting of praseodymium, gadolinium, erbium, and neodymium, and wherein at least one of these is provided for co-doping.

7. The composition according to claim 1 , wherein the at least one phosphor which, on irradiation with electromagnetic radiation having lower energy and longer wavelength in the range from 2000 nm to 400 nm, emits electromagnetic radiation having higher energy and shorter wavelength in the range from 400 nm to 100 nm, where the intensity of the emission maximum of the electromagnetic radiation having higher energy and shorter wavelength is an intensity of at least 1·10 3 counts/(mm 2 *s).

8. The composition according to claim 6 , wherein the at least one phosphor according to formula (II) has XRPD signals in the range from 23° 2Θ to 27° 2Θ and from 34° 2Θ to 39.5° 2Θ.

9. The composition according to claim 1 , wherein the at least one film-forming polymer contains functional groups.

10. The composition according to claim 1 , wherein the at least one film-forming polymer is selected from the group consisting of hydroxy-functional acrylate polymers, hydroxy-functional polyester polymers, hydroxy-functional polyether polymers, hydroxy-functional cellulose derivatives, and amino-functional aspartic polymers or polyester polymers, which reacts with an isocyanate-containing curing agent.

11. The composition according to claim 1 , wherein a transmittance of the at least one film-forming polymer is at least 75%, by means of a twin-beam UV/VIS spectrometer.

12. The composition according to claim 1 , wherein a transmittance of the composition is at least 70%, by means of a twin-beam UV/VIS spectrometer.

13. The composition according to claim 1 , wherein the at least one phosphor has an average particle size of d50=0.1-100 μm, measured to ISO 13320:2020 and USP 429.

14. The composition according to claim 1 , wherein the at least one additive is present, and wherein the at least one additive is selected from the group consisting of dispersants, rheology aids, levelling agents, wetting agents, defoamers, and UV stabilizers.

15. The composition according to claim 1 , wherein the at least one curing agent is present, and wherein the at least one curing agent is selected from the group consisting of aliphatic and cycloaliphatic isocyanates.

16. The composition according to claim 1 , wherein coatings produced therefrom have antimicrobial action against bacteria, yeasts, moulds, algae, parasites, and viruses.

17. The composition according to claim 1 , wherein coatings produced therefrom have antimicrobial action against pathogens of nosocomial infections, pathogenic environmental organisms, and pathogens in food and drink.

18. A method for production of a dispersion, millbase, adhesive, trowelling compound, render, paint, coating, printing ink, inkjet, grinding resin, or pigment concentrate, the method comprising:
mixing the composition according to claim 1 into the dispersion, millbase, adhesive, trowelling compound, render, paint, coating, printing ink, inkjet, grinding resin, or pigment concentrate.

19. A method for production of coatings having an antimicrobial property, the method comprising:
mixing the composition according to claim 1 into a coating composition.

20. A method for coating substrates in hygiene facilities, hospitals, and in the food and drink industry, the method comprising:
applying a coating composition comprising the composition according to claim 1 , to the substrates.

21. A process for forming an antimicrobial coating on a substrate, the process comprising:
applying a curable film-forming composition according to claim 1 , to the substrate, wherein the curable film-forming composition comprises
(a) at least one film-forming polymer containing functional groups reactive with an isocyanate-containing curing agent, optionally catalysed by a catalyst,
(b) at least one phosphor of formula (II), and
(c) a curing agent containing isocyanate-functional groups.

22. The process according to claim 21 , wherein the substrate comprises metal, mineral substrates, cellulosic substrates, wood and hybrids thereof, dimensionally stable plastics, and/or thermosets.

23. The process according to claim 21 , wherein a primer composition is applied to the substrate prior to the application of the curable film-forming composition.

24. An article, wherein the article has been coated at least partly with the curable composition according to claim 1 .

Assignees

• Evonik Operations Gmbh

Inventors

• Schulte Simone
• Hallack Markus
• Krusenbaum Sabine
• Janke Christina

Classifications

• C09D101/14 Primary

  Mixed esters, e.g. cellulose acetate-butyrate · CPC title

• C09D5/14 Primary

  Paints containing biocides, e.g. fungicides, insecticides or pesticides (C09D5/16 takes precedence) · CPC title

• C09D133/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title

• C09D175/06

  from polyesters · CPC title

• C09D179/08

  Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors · CPC title