Silicone elastomer product exhibiting a biocidal activity
The present invention relates to an antimicrobial product obtained from a silicone-based system exhibiting a biocidal activity on its surface, said system comprising a silicone elastomer matrix and a mineral filler of particles chosen from the group of the silicas or aluminosilicates, for example zeolites or bentonites, said particles being dispersed in said matrix and comprising, grafted to their surface, molecules of the alkylsilane type incorporating at least one quaternary ammonium functional group.
1. An antimicrobial product, comprising a silicone-comprising system, said system comprising:
a silicone elastomer matrix; and
a mineral filler of particles selected from the group consisting of a silica and an aluminosilicate,
wherein said particles are dispersed in said matrix and comprise, grafted to their surface, at least one alkylsilane molecule comprising at least one quaternary ammonium functional group, and
wherein the product exhibits biocidal activity on its surface.
wherein the product exhibits biocidal activity on its surface,
wherein the product is suitable for a food application, and
wherein a percentage by weight of a total amount of the at least one alkylsilane molecule with respect to the silicone elastomer matrix is greater than 0% and less than 0.2%, thereby providing the biocidal activity.
2. The product of claim 1 , wherein the at least one alkylsilane molecule is obtained from at least one precursor of a structure:
wherein:
m is an integer varying between 1 inclusive and 10 inclusive;
n is 0, 1, or 2;
R is a linear CH 3 —(CH 2 ) w alkyl chain, wherein w is between 0 and 5, or an isomeric branched form of said linear CH 3 —(CH 2 ) w chain;
R 1 is a hydrocarbon chain optionally comprising at least one alcohol and/or ether functional group;
the R 2 groups, which are identical or different on the same precursor, each represent a linear (CH 2 ) z —CH 3 alkyl chain, wherein z is between 1 and 30, or an isomeric branched form of said linear (CH 2 ) z —CH 3 chain; and
R 3 is a second linear CH 3 —(CH 2 ) w alkyl chain, wherein w is between 0 and 5, an isomeric branched form of said second linear CH 3 —(CH 2 ) w chain, or another alkylsilane group.
3. The product of claim 2 , wherein:
m=1;
n=0;
w=0, 1, or 2; and
R 1 represents a linear (CH 2 ) y alkyl, wherein y is between 1 and 10, or an isomeric branched form of said linear (CH 2 ) y alkyl.
4. The product of claim 2 , wherein the at least one alkylsilane molecule is obtained from a precursor of formula:
5. The product of claim 1 , wherein a mean size of the particles of the mineral filler is between 0.01 micron and 500 microns.
6. The product of claim 1 , wherein said particles comprise an amorphous material, a specific surface of which is between 10 and 1000 m 2 /g.
7. The product of claim 1 , wherein the percentage by weight of a total amount of the at least one alkylsilane molecule with respect to the silicone elastomer matrix is greater than 0.005% and less than 0.2%.
8. The product of claim 1 , wherein the percentage by weight of a total amount of the at least one alkylsilane molecule with respect to the silicone elastomer matrix is between 0.01% and 0.2%.
9. The product of claim 1 , wherein a ratio by weight of the mineral filler grafted with the at least one alkylsilane molecule to the silicone elastomer matrix is between 0.1% and 50%.
10. A silicone elastomer tube comprising the antimicrobial product of claim 1 .
11. The product of claim 1 , wherein the mineral filler is a zeolite or bentonite.
12. The product of claim 2 , wherein w is between 1 and 5.
13. The product of claim 2 , wherein for at least one of the R 2 groups, z is greater than 15.
14. The product of claim 1 , wherein a mean size of the particles of the mineral filler is between 0.1 micron and 200 microns.
15. The product of claim 6 , wherein the amorphous material is amorphous silica.
16. The product of claim 6 , wherein the specific surface of the particles is between 50 and 500 m 2 /g.
17. The product of claim 15 , wherein the specific surface of the particles is between 50 and 500 m 2 /g.
18. The product of claim 1 , wherein a ratio by weight of the mineral filler grafted with the at least one alkylsilane molecule to the silicone elastomer matrix is between 0.5% and 20%.
19. The product of claim 1 , wherein the product is suitable for delivering a liquid food.
20. A method of delivering a liquid food, the method comprising delivering the liquid food with the silicone elastomer tube of claim 10 .