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US 12,245,592 B2Granted
Encapsulated biocides and biorepellents
AssigneeAerogel ApS
InventorEva Wallstroem
Life of this patent
Estimating the term…
Abstract
The present invention relates to silica aerogels with a high to very high loading (60-90% w/w) of encapsulated biocidal and/or biorepellant compounds and to methods of making and using such aerogels in anti-fouling compositions, which are especially suitable for marine use.
Claims20
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.
Antifouling paint composition comprising a pigment and an anti-fouling additive comprising an inorganic, silica-containing aerogel comprising
- a. a porous gel lattice,
- b. optionally an alcoxide comprising Sc 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 one or more biocidal or biorepellant compounds entrapped in said aerogel, wherein said silica-containing aerogel comprises at least 60% by weight of the one or more biocidal or biorepellant compounds entrapped within the silica aerogel 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 composition 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.
Dependencies are inferred from the claim text.