Claims for Patent: 6,217,909

Summary for Patent: 6,217,909

Title:	Pharmaceutical excipient having improved compressibility
Abstract:	A microcrystalline cellulose-based excipient having improved compressibility, whether utilized in direct compression, dry granulation or wet granulation formulations, is disclosed. The excipient is an agglomerate of microcrystalline cellulose particles and from about 0.1% to about 20% silicon dioxide particles, by weight of the microcrystalline cellulose, wherein the microcrystalline cellulose and silicon dioxide are in intimate association with each other. The silicon dioxide utilized in the novel excipient has a particle size from about 1 nanometer to about 100 microns. Most preferably, the silicon dioxide is a grade of colloidal silicon dioxide.
Inventor(s):	Bob E. Sherwood, John H. Staniforth, Edward A. Hunter
Assignee:	J Rettenmaier and Soehne GmbH and Co KG
Application Number:	US09/438,646
Patent Claims:	1. An excipient composition comprising a particulate agglomerate of coprocessed microcrystalline cellulose and from about 0.1% to about 20% by weight silicon dioxide, the microcrystalline cellulose and silicon dioxide being in intimate association with each other, said silicon dioxide portion of said agglomerate being derived from a silicon dioxide having an average primary particle size from about 1 nm to about 100 μm, said excipient composition having a bulk density of from about 0.35 g/ml to about 0.6 g/ml. 2. The composition of claim 1, wherein said silicon dioxide portion of said agglomerate is derived from a silicon dioxide having an average primary particle size from about 5 nm to about 40 μm. 3. The composition of claim 1, wherein said silicon dioxide portion of said agglomerate is derived from colloidal silicon dioxide. 4. The composition of claim 1, wherein said silicon dioxide is included in amount from about 0.1% to about 20% by weight, based on the weight of microcrystalline cellulose. 5. The composition of claim 1, wherein said silicon dioxide is from about 0.5% to about 10% by weight, based on the weight of said microcrystalline cellulose. 6. The composition of claim 1, wherein said silicon dioxide is included in an amount of from about 1.25% to about 5%, based on the weight of said microcrystalline cellulose. 7. The composition of claim 1, wherein said excipient particles have an average particle size of from about 10 μm to about 1,000 μm. 8. The composition of claim 1, wherein said excipient particles have an average particle size of from about 10 μm to about 500 μm. 9. The composition of claim 1, wherein said excipient particles have an average particle size of from about 30 μm to about 250 μm. 10. The composition of claim 1, wherein said excipient particles have a moisture content from about 0.5% to about 15%. 11. The composition of claim 1, wherein said excipient particles further comprise a member of the group consisting of non-silicon metal oxides, starches, starch derivatives, surfactants, polyalkylene oxides, celluloses, cellulose ethers, cellulose esters and mixtures thereof. 12. The composition of claim 1, wherein said silicon dioxide portion of said agglomerate is derived from a silicon dioxide having a surface area from about 10 m2/g to about 500m2/g. 13. The composition of claim 1, wherein said silicon dioxide portion of said agglomerate is derived from a silicon dioxide having a surface area from about 175 m2/g to about 350 m2/g. 14. The composition of claim 1, wherein said excipient has a bulk density from about 0.35 g/ml to about 0.55 g/ml. 15. An excipient composition comprising a particulate agglomerate of coprocessed microcrystalline cellulose and from about 0.1% to about 20% by weight silicon dioxide, the microcrystalline cellulose and silicon dioxide being in intimate association with each other, said silicon dioxide portion of said agglomerate being derived from a silicon dioxide having an average primary particle size from about 1 nm to about 100 μm, said excipient composition having a bulk density of from about 0.2 g/ml to about 0.6 g/ml, said excipient composition having an average particle size of from about 10 μm to about 1,000 μm. 16. The composition of claim 15, wherein said excipient particles have an average particle size of from about 10 μm to about 500 μm. 17. The composition of claim 15, wherein said excipient particles have an average particle size of from about 30 μm to about 250 μm. 18. The composition of claim 15, wherein said silicon dioxide portion of said agglomerate is derived from a silicon dioxide having an average primary particle size from about 5 nm to about 40 μm. 19. The composition of claim 15, wherein said silicon dioxide portion of said agglomerate is derived from colloidal silicon dioxide. 20. The composition of claim 15, wherein said silicon dioxide is included in amount from about 0.1% to about 20% by weight, based on the weight of microcrystalline cellulose.