Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Tablets – lozenges – or pills
Reexamination Certificate
2000-04-27
2003-09-23
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Tablets, lozenges, or pills
C424S464000, C424S469000, C424S470000, C424S489000
Reexamination Certificate
active
06623756
ABSTRACT:
FIELD OF INVENTION
The present invention relates to slightly cross-linked polymers and copolymers generally derived from one or more unsaturated carboxylic acids, which are mixed with one or more active ingredients, and one or more excipients, wherein the mixture has desired properties such as good flow rates and appropriate compressibility so that without further processing it can flow through a die and be directly compressed into a tablet or other solid dosage article.
BACKGROUND OF THE INVENTION
Heretofore, rheology agents were generally unsuitable for utilization in the formation of directly compressed tablets generally due to their fine particle size, static generating nature, and poor flow characteristics which they imparted to powder mixtures such as pharmaceutical mixtures. In order to form such powder mixtures, a rheologic agent in the form of a non-granulated powder was mixed with an active ingredient and an excipient and granulated. Subsequently, the granulated mixture was compressed into a tablet. The rheologic agents utilized included compounds such as Carbopol® 934 PNF, 971 PNF, 974 PNF, 940, 941, and 934 made by B.F. Goodrich Company. Other similar rheologic agents include Synthalen K, L, and M made by 3V/Sigma, Hivis Wako made by Wako Pure Chemicals Co., and Aqupec made by Sumitomo Seika.
SUMMARY OF INVENTION
Solid dosage forms such as tablets for pharmaceutical uses are directly compressed from a mixture of granular rheology modifying polymers or copolymers, active ingredients, and excipients. The rheology modifier is a homopolymer or copolymer derived from one or more unsaturated carboxylic acids and is slightly cross-linked. The rheology modifying polymer or copolymer is processed into a desirable granular size as by being compacted into large agglomerates or aggregates and subsequently fractured into smaller granules and generally screened to obtain suitable particle sizes which have low amounts of dust. The polymer or copolymer becomes highly swollen in an aqueous medium and is suitable for use in a human being or animal. The polymer or copolymer can be combined with numerous different types of active ingredients for one or more specific end uses. Moreover, numerous different types of excipients can be utilized. The combination of the one or more excipients, active ingredients, and the rheology modifying polymer or copolymer when mixed generally form suitable mixtures for directly compressible tablets because of their good flow characteristics and compressibility.
REFERENCES:
patent: 2798053 (1957-07-01), Brown
patent: 3915921 (1975-10-01), Schlatzer, Jr.
patent: 4267103 (1981-05-01), Cohen
patent: 4952651 (1990-08-01), Kasai et al.
patent: 5288814 (1994-02-01), Long, II et al.
patent: 5780055 (1998-07-01), Habib et al.
patent: 5858406 (1999-01-01), Stead et al.
patent: WO 93/23457 (1993-11-01), None
Bulletin 17: Controlled Release tablets and Capsules; copyright 1996 the BFGoodrich Company, Pharmaceuticals Division.
Greenberg Edward S.
Guo Jian-Hwa
Wilber William R.
Dunlap Thoburn T.
Hudak, Shunk & Farine Co. LPA
Noveon IP Holdings Corp.
Page Thurman K.
Tran S.
LandOfFree
Directly compressed solid dosage articles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Directly compressed solid dosage articles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Directly compressed solid dosage articles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3075785