Sustained release biocidal powders
AssigneeBernard Technologies, Inc.
InventorsStephen T. Wellinghoff, Sumner A. Barenberg, Hong Dixon, Joel J. Kampa
Life of this patent
Estimating the term…
Abstract
A powder for sustained release of a gas including a hydrophilic core, a hydrophobic layer on an outer surface of the hydrophilic core, and particles in contact with the hydrophobic layer. The hydrophobic layer contains an acid releasing agent. The particles contain an anhydrous material capable of binding with water. The core, the particles, and the hydrophobic layer are substantially free of water, and the core is capable of generating and releasing a gas after hydrolysis of the acid releasing agent.
Claims65
A powder for sustained release of a gas comprising:
- a hydrophilic core;
- a hydrophobic layer on an outer surface of the hydrophilic core, the hydrophobic layer containing an acid releasing agent;
- and
- particles in contact with the hydrophobic layer, the particles containing an anhydrous material capable of binding with water;
- the core, the particles, and the hydrophobic layer being substantially free of water;
- the core being capable of generating and releasing a gas after hydrolysis of the acid releasing agent.
A powder for sustained release of a gas comprising:
- a hydrophilic core;
- a first hydrophobic layer containing an acid releasing agent;
- a second hydrophobic layer between the first hydrophobic layer and the hydrophilic core;
- and
- particles in contact with the first hydrophobic layer, the particles containing an anhydrous material capable of binding with water;
- the core, the particles, the first hydrophobic layer and the second hydrophobic layer being substantially free of water;
- the core being capable of generating and releasing a gas after hydrolysis of the acid releasing agent.
A powder for sustained release of a gas comprising:
- a hydrophilic core containing chlorite anions;
- a first hydrophobic layer containing an acid releasing wax having the formula ##STR12## wherein each R is individually selected from hydrogen, hydroxy, alkyl, alkenyl, or --OC(O)R';
- R' is a C.sub.4 to C.sub.27 alkyl or C.sub.4 to C.sub.27 alkenyl;
- x is an integer from 1 to 30;
- y is an integer from 0 to 30;
- and z is an integer from 0 to 30;
- a second hydrophobic layer between the first hydrophobic layer and the hydrophilic core, the second hydrophobic layer containing microcrystalline wax, paraffin wax, synthetic wax, or a polymer;
- and
- particles in contact with the first hydrophobic layer, the particles containing an anhydrous material capable of binding with water;
- the core, the particles, the first hydrophobic layer and the second hydrophobic layer being substantially free of water;
- the core being capable of releasing chlorine dioxide gas upon hydrolysis of the acid releasing agent.
A process for preparing a powder providing sustained release of a gas, the process comprising:
- providing a hydrophobic liquid containing an acid releasing agent;
- admixing hydrophilic particles containing anions into the hydrophobic liquid to form coated hydrophilic particles;
- admixing anhydrous particles with the coated hydrophilic particles to form a product;
- cooling the product;
- and
- fragmenting the product to form a powder.
A process for preparing a powder providing sustained release of a gas, the process comprising:
- providing a hydrophobic liquid;
- admixing hydrophilic particles containing anions into the hydrophobic liquid to form coated hydrophilic particles;
- admixing a hydrophobic material containing an acid releasing agent with the coated hydrophilic particles to form an intermediate powder;
- admixing the intermediate powder with anhydrous particles to form a product;
- cooling the product;
- and
- fragmenting the product to form a powder.
Dependencies are inferred from the claim text.