Self-disinfecting surfaces
The invention relates to an aqueous coating composition comprising a compound having reactive groups A, and a quaternary ammonium compound according to Formula I, II or III wherein R 1 is an alkyl, alkenyl, alkylaryl or arylalkyl group having from 5 to 50 carbon atoms; R 2 is a C 1 -C 100 hydrocarbyl group, optionally containing heteroatoms; R 3 and R 4 are alkylene groups having from 1 to 4 carbon atoms; R 5 and R 6 are H or C 1 -C 100 hydrocarbyl group, optionally containing heteroatoms; R 7 is a C 1 -C 100 hydrocarbyl group, optionally containing heteroatoms; R 8 is a C 1 -C 100 hydrocarbyl group, optionally containing heteroatoms; R 9 is H or a methyl group; Z is a substituent containing at least one reactive group B which is capable of reacting with the reactive group A; X − is an anion; y is 0 or 1; a is 0 or 1; and the sum of y and a is 1 or 2 and m is an integer from 1 to 30, preferably between 1 and 10, or between 2 and 6 n is an integer from 0-30, preferably between 1 and 10, or 2 and 6 T is a monomer unit; U is a monomer unit; V is a C 1 -C 100 hydrocarbyl group, optionally containing hetero atoms; d is an integer between 1 and 5, preferably 1; e is an integer between 1 and 1000, preferably between 5 and 100; g is an integer between 1 and 100, preferably between 2 and 10; h is an integer between 1 and 5, preferably 2 or 3.
1. A process for forming a coating having antimicrobial properties on a substrate comprising the steps of:
a. applying a coating composition comprising a quaternary ammonium compound having an alkoxylated substituent having a reactive hydroxyl group according to formula (Ia), (II), or (III) to a substrate, and
b. curing the coating composition to obtain a cured coating,
wherein the reactive hydroxyl group of the alkoxylated substituent has reacted within the cured coating,
wherein:
R 1 is an alkyl, alkenyl, alkylaryl or arylalkyl group having from 5 to 50 carbon atoms;
R 2 is a C 1 -C 100 hydrocarbyl group, optionally containing heteroatoms;
R 3 is a C 1 -C 4 alkylene group;
R 4 is a C 1 -C 4 alkylene group;
R 5 and R 6 are H or C 1 -C 100 hydrocarbyl group, optionally containing heteroatoms;
R 7 is a C 1 -C 100 hydrocarbyl group, optionally containing heteroatoms;
R 9 is H or methyl;
Z is OH;
X − is an anion;
m is an integer from 1 to 30;
n is an integer from 1 to 30; and
T is a monomer unit;
U is a monomer unit;
V is a C 1 -C 100 hydrocarbyl group, optionally containing hetero atoms;
d is an integer between 1 and 5;
e is an integer between 1 and 1000;
g is an integer between 1 and 100;
h is an integer between 1 and 5.
2. The process according to claim 1 , wherein R 9 is H.
3. The process according to claim 1 , wherein R 1 is a linear alkyl group having from 10 to 15 carbon atoms.
4. The process according to claim 1 , wherein the coating composition has a low anti-microbial activity, wherein the low anti-microbial activity is defined as less than 20% inhibition of bacterial growth of pseudomonas aeruginosa, according to ISO/FDIS 20776-1 (2006).
5. The process according to claim 1 , wherein the cured coating has a surface charge above 1×10 15 /cm 2 .