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1. (WO2018102152) AN AQUEOUS BINDER SYSTEM, A COATING COMPOSITION & A COATING
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CLAIMS:

1. An aqueous binder system for a coating composition, the aqueous binder system comprising :

A) at least 10 wt% water, based on the total weight of the aqueous binder system;

B) at least one hydroxyl-functional binder polymer; and

C) from 0.1 to 20 wt%, based on the total weight of the aqueous binder system, of at least one quaternary ammonium compound, wherein the quaternary ammonium compound comprises a core quaternary ammonium group which has pendant groups which comprise:

i) a hydrocarbyl group having 8 to 16 carbon atoms which is a linear or branched, alkyl or alkenyl group;

ii) two independent hydroxyl terminated groups, wherein each hydroxyl terminated group comprises from 1 to 10 alkylene oxide residues and wherein the total number of alkylene oxide residues in the quaternary ammonium compound is from 5 to 12; and

iii) a CI to C8 hydrocarbyl group;

wherein B) and C) are not covalently bonded to each other within the aqueous binder system.

2. An aqueous binder system according to claim 1 wherein the quaternary ammonium compound is of formula (I) :


wherein :

R1 is a hydrocarbyl group having 8 to 16 carbon atoms which is a linear or branched, alkyl or alkenyl group;

m and n independently have a value from 1 to 10, preferably from 1 to 7, particularly preferably from 2 to 6;

the sum of m + n is from 5 to 12; and

each X is independently selected from an ethylene oxide residue terminating at -0- and a propylene oxide residue terminating at -0-; such that the compound of formula (I) comprises two terminal hydroxyl groups.

3. An aqueous binder system according to claim 1 or claim 2 wherein the hydroxyl functional binder polymer is selected from poly(meth)acrylates, polyurethanes, polyesters and co-polymers thereof.

4. An aqueous binder system according to any preceding claim comprising from 40 to 80 wt% water, based on the total weight of the aqueous binder system.

5. An aqueous binder system according to any preceding claim comprising from 10 to 50 wt% hydroxyl functional binder polymer, based on the total weight of the aqueous binder system.

6. An aqueous binder system according to any preceding claim comprising at least one pigment or dye.

7. An aqueous binder system according to any preceding claim comprising at least one surfactant selected from anionic surfactants and non-ionic surfactants.

8. A coating composition comprising an aqueous binder system according to any preceding claim and a polyisocyanate.

9. A coating obtainable by curing a coating composition according to claim 8 so that B) and C) react with the polyisocyanate to form a polymeric matrix.

10. A coating according to claim 9 wherein the coating has an antimicrobial activity according to JIS Z 2801 of at least log 2 reduction of E.coli activity.

11. A coating according to claim 9 or 10 wherein the coating has an antimicrobial activity according to 3IS Z 2801 of at least log 2 reduction of Staphylococcus activity.

12. A coating according to any of claims 9 to 11 wherein the coating comprises at most 14wt% of C) on the basis of the total solids content in the coating.

13. A method of providing an anti-microbial coating on a substrate comprising the steps of applying a coating composition according to claim 8 to the substrate and curing the coating composition.

14. The use of a quaternary ammonium compound of formula (I) to provide an antimicrobial activity to a coating by reacting the quaternary ammonium compound into a polymeric matrix formed upon curing an aqueous coating composition.