Patent ID: 6905698

Claim:
A particulate composition of matter comprising a liquid dispersible mass of porous inorganic carrier particles which is at least one of amorphous silicas, amorphous aluminas, pseudoboehmites, Y-zeolites, dealuminated Y-zeolites or mixtures of two or more thereof and biocide releasably adsorbed within the pore system thereof, said particles having a retention factor R, determined from the equation R=A/P, where A represents the percentage active ingredient by weight remaining in the pore system after contacting a sample consisting of a homogenised mixture of 0.75 g biocide and 2.25 g of carrier particles with 1000 ml of water for 90 minutes and P represents the potency as defined by the Minimum Inhibition Concentration in mg of active ingredient per liter of the biocide determined with respect to the reference microorganism Aureobasidium pullulans , of at least 0.6, and a BET surface area of at least 200 m 2 g, wherein the biocide is at least one of 2-methyl-4-isothiazolone, 2-ethyl-4-isothiazolin-3-one, 2-propyl-4-isothiazolin-3-one, 2-butyl-4-isothiazolin-3-one, 2-amyl-4-isothiazolin-3-one, 5-chloro-2-methyl-4-isothiazolin-3-one, 5-bromo-2-methyl-4-isothiazolin-3-one, 5-iodo-2-methyl-4-isothiazolin-3-one, 5-chloro-2-butyl-4-isothiazolin-3-one, 5-bromo-2-ethyl-4-isothiazolin-3-one, 5-iodo-2-amyl-4-isothiazolin-3-one, 1,2-benzisothiazolin-3-one, 2-n-octyl-4-isothiazolin-3-one, or 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one.