US 12,245,592 B2
Encapsulated biocides and biorepellents
Eva Wallstroem, Copenhagen (DK)
Assigned to Aerogel ApS, Copenhagen (DK)
Filed by Aerogel ApS, Copenhagen (DK)
Filed on Nov. 12, 2021, as Appl. No. 17/525,025.
Application 17/525,025 is a continuation of application No. 17/255,303, previously published as PCT/EP2019/067445, filed on Jun. 28, 2019.
Claims priority of application No. 18180787 (EP), filed on Jun. 29, 2018.
Prior Publication US 2022/0079162 A1, Mar. 17, 2022
Int. Cl. A01N 59/20 (2006.01); A01N 25/04 (2006.01); A01N 25/08 (2006.01); A01N 43/40 (2006.01); A01N 59/16 (2006.01); A01P 1/00 (2006.01); A01P 3/00 (2006.01); A01P 17/00 (2006.01); C09D 5/14 (2006.01); C09D 5/16 (2006.01)
CPC A01N 59/20 (2013.01) [A01N 25/04 (2013.01); A01N 25/08 (2013.01); A01N 43/40 (2013.01); A01N 59/16 (2013.01); A01P 1/00 (2021.08); A01P 3/00 (2021.08); A01P 17/00 (2021.08); C09D 5/14 (2013.01); C09D 5/1687 (2013.01)] 20 Claims
 
1. A method for preventing fouling of a marine surface, comprising painting the surface with a paint including an anti-fouling additive comprising an inorganic, silica-containing aerogel comprising
a. a porous gel lattice, and
b. optionally an alcoxide comprising at least one of 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. one or more biocidal or biorepellant compounds entrapped in said silica containing aerogel, wherein said silica-containing aerogel comprises at least 60% by weight of the one or more biocidal or biorepellant compounds, and one or more biocidal or biorepellant compounds are entrapped within the silica containing aerogel during formation of the porous gel lattice, and wherein the bulk density of said silica containing aerogel has a value of at most 0.5 gr/ml when said silica containing aerogel comprises at most 75% by weight Zn pyrithione, the paint absorbing between 1.5% and 6% water by weight when the dry paint film is immersed in artificial seawater having salinity of 31-35 ppt and a pH between 7.8-8.2.