US 12,378,421 B2
Freeze-dried loaded aerogel particles with biocidal properties
Eva Wallström, Copenhagen Ø (DK)
Assigned to AEROGEL APS, Copenhagen Ø (DK)
Appl. No. 18/572,144
Filed by AEROGEL APS, Copenhagen Ø (DK)
PCT Filed Jun. 30, 2022, PCT No. PCT/EP2022/068179
§ 371(c)(1), (2) Date Dec. 19, 2023,
PCT Pub. No. WO2023/275312, PCT Pub. Date Jan. 5, 2023.
Claims priority of application No. 21182697 (EP), filed on Jun. 30, 2021.
Prior Publication US 2024/0270982 A1, Aug. 15, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. C09D 5/16 (2006.01); A01N 25/04 (2006.01); A01N 25/28 (2006.01); A01P 15/00 (2006.01); C08K 3/36 (2006.01); C09D 5/14 (2006.01)
CPC C09D 5/1687 (2013.01) [A01N 25/04 (2013.01); A01N 25/28 (2013.01); A01P 15/00 (2021.08); C08K 3/36 (2013.01); C09D 5/14 (2013.01); C08K 2201/001 (2013.01)] 12 Claims
 
1. Antifouling additive comprising:
a. a freeze-dried inorganic, silica-containing aerogel comprising a porous gel lattice with
i. a total porosity of at least 40%, and
ii. a mesopore diameter of at least 10 nm,
b. optionally an alcoxide comprising Sc, Ti, V, Cr, Mn, Fe, Co, Y, Zr, Nb, Ru, Hf, Ta, W, Re, Al, Ge, In, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb or Lu, and
c. at least 55% by weight of one or more biocidal or biorepellant compounds selected from 4,5-dichloro-2-octyl-4-isothiazolin-3-one (DCOIT), 2-(p-chlorophenyl)-3-cyano-4-bromo-5-trifluoromethyl pyrrole, zinc ethylenebis (dithiocarbamate) (Zineb), 3-(3,4-dichloro-phenyl)-1,1-dimethylurea 3-iodo-2-propynylbutylcarbamate (IPBC), 2-tert-butylamino-4-ethylamino-6-methyl-thio-1,3,5-triazine (terbutryn), 1-(4-chlorophenyl)-4,4-dimethyl-3-(1H-1,2,4-triazol-1-ylmethyl) pentan-3-ol (tebuconazole), zinc pyrithione, tolylfluanid, dichlofluanid, N,N-didecyl-N,N-dimethylammonium carbonate N,N-didecyl-N,N-dimethylammonium bicarbonate, 2-thiazol-4-yl-1H-benzoimidazole (thiabendazole), 4-[1-(2,3-dimethylphenyl) ethyl]-3H-imidazole (medetomidine), and mixtures thereof entrapped in said aerogel,
wherein the entrapment of said one or more biocidal or biorepellant compounds takes place during the sol-gel formation of the gel and wherein the sol-gel precursor is one or more alkoxysilanes selected from tetraethoxysilane, tetra-n-propoxysilane and alkyltrialkoxysilanes, and wherein the inorganic, silica-containing aerogel contains alkoxysilane (Si—OR) terminal groups selected from ethoxysilane (Si—OEt) or n-propoxysilane (Si—OPr) groups.