Binder composition and method for processing poorly compressible drugs into tablets of predetermined hardness and friability
View Patent ↗Tablets of a poorly compressible drug are made by direct compression using a binder composition which is a polymer, preferably a copolymer of polyvinylpyrrolidone (PVP) and vinyl acetate (VA), having a defined glass transition temperature (Tg), admixed with a plasticizer, e.g. an organic ester or polyol, which reduces the Tg of the copolymer by at least 10° C. The binder composition and the drug are directly compressed into a tablet of predetermined hardness and friability, and at an acceptable compression force.
1. A process for making tablets of a poorly compressible drug by direct compression, which comprises providing a binder composition which is made by spray drying an aqueous dispersion of a copolymer of polyvinylpyrrolidone (PVR) and vinyl acetate (VA), having a defined glass transition temperature (Tg), and an effective amount of 5-15 wt. % of a plasticizer which is an organic ester or polyol therewith to reduce the Tg of said copolymer by at least 20° C., admixing said binder composition and 50-90 wt. % of said drug, and forming a tablet thereof by direct compression having a predetermined hardness and friability, and at an acceptable compression force.
2. A process according to claim 1 wherein said drug is naproxen or acetaminophen.
3. A process according to claim 1 wherein said copolymer comprises 60 wt. % PVP and 40% VA, having a Tg of about 106° C.
4. A process according to claim 1 wherein the binder composition is a free-flowing powder having an average particle size of about 30-90μ.
5. A process according to claim 1 wherein said plasticizer is triethyl citrate.
6. A process according to claim 1 wherein direct compression is carried out at 3000-7000 lbs. and the tablet has a hardness of at least about 8 kP and a friability of less than about 3.
7. A process according to claim 6 wherein said tablet hardness is about 8-30 kP, and said friability is about 1-3.
8. A binder composition for direct compression of a poorly compressible drug, comprising a free-flowing powder which is a spray dried aqueous dispersion of a copolymer of polyvinylpyrrolidone (PVP) and vinyl acetate (VA), and an effective amount of 5-15 wt. % of a plasticizer which is an organic ester or polyol to reduce the Tg of the polymer by at least 20° C.
9. A binder composition according to claim 8 wherein said copolymer comprises 60 wt. % PVP and 40 wt. % VA, having a Tg of about 106° C.
10. A binder composition according to claim 8 which has an average particle size of about 30-90μ.
11. A binder composition according to claim 8 wherein said plasticizer is triethyl citrate or polyethylene glycol.
12. A binder composition according to claim 8 in which said spray drying is carried out in the presence of silica powder.
13. A mixture of a poorly compressible drug and the binder composition of claim 8 .
14. A mixture according to claim 13 which also includes other excipients.
15. A drug tablet formed by the process of claim 1 .
16. A drug tablet of claim 15 in which said drug is naproxen or acetaminophen.
17. A drug tablet of claim 15 wherein said drug is present in an amount of about 50-90 wt. % therein.