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US 7,070,828 B2Granted
Process for coating solid particles
AssigneeDow Global Technologies LLC
InventorsPaul J. Sheskey, Colin M. Keary
Life of this patent
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Abstract
A process for coating solid particles which comprises the steps of a) contacting a gas with a fluid composition comprising i) a polymer and ii) a liquid diluent to produce a foam, and b) contacting the produced foam with solid particles and agitating the particles to provide a coating on the solid particles.
Claims17
A process for coating solid particles comprising the steps of
- a) contacting a gas with a fluid composition comprising i) from 0.01 to 30 weight percent of a polymer, ii) from 99.99 to 70 percent of a liquid diluent, based on the total weight of the polymer i) and the liquid diluent ii), to produce a foam, and
- b) contacting the produced foam with solid particles and agitating the particles to provide a coating on the solid particles,
- wherein the solid particles comprise a drug or the fluid composition comprises a drug or the solid particles and the fluid composition comprise a drug,
- wherein the polymer i) has a weight average molecular weight of at least 10,000 and is one or more polymers selected from the group consisting of cellulose ethers, cellulose esters, polyalkylene oxides, homo- and copolymers of vinyl alcohol, and homo- and copolymers of vinylpyrrolidone,
- wherein the liquid diluent is a monofunctional alcohol, alkene, alkane, halogenated alkene, halogenated alkane, ether, ester, a paraffin oil, an animal oil, a vegetable oil, or water, and
- wherein the amount of other additives, if present, is up to 25 weight percent, based upon the total weight of the fluid composition.
3 more elements
A process for coating solid particles comprising the steps of
- a) contacting a gas with a fluid composition comprising i) from 0.01 to 30 weight percent of a polymer, ii) from 99.9 to 70 percent of a liquid diluent, based on the total weight of the polymer i) and the liquid diluent ii), to produce a foam, and
- b) contacting the produced foam with solid particles and agitating the particles to provide a coating on the solid particles,
- wherein the solid particles comprise a drug or the fluid composition comprises a drug or the solid particles and the fluid composition comprise a drug,
- wherein the polymer i) has a weight average molecular weight of at least 10,000 and is a cellulose ether or a cellulose ester and
- wherein the amount of other additives, if present, is up to 25 weight percent, based upon the total weight of the fluid composition.
2 more elements
Dependencies are inferred from the claim text.