Fast-Disintegrating Microporous Binders
A highly porous, fast-disintegrating binder suitable for pharmaceutical applications and methods of making the same are disclosed, the binder comprising microporous particles of an aqueous-soluble cellulosic polymer and a wicking agent. Pharmaceutical compositions and fast-disintegrating dosage forms containing the binder are also disclosed.
1 . A fast-disintegrating dosage form comprising a drug and a microporous binder, said microporous binder being free from said drug and comprising a plurality of particles, each of said particles comprising an aqueous-soluble cellulosic polymer and a wicking agent, said wicking agent being selected from the group consisting of polyols, salts, organics, low-molecular-weight polymers, and mixtures thereof, wherein said aqueous-soluble polymer and said wicking agent together comprise at least about 60 wt % of said microporous binder, and wherein said microporous binder has a porosity of at least about 70%.
2 . The dosage form of claim 1 wherein said polyols are selected from the group consisting of sugars, sugar alcohols, and mixtures thereof.
3 . The dosage form of claim 2 wherein said wicking agent is selected from the group consisting of sucrose, glucose, dextrose, lactose, mannitol, sorbitol, trehalose, xylitol, and mixtures thereof.
4 . The dosage form of claim 1 wherein said polymer is selected from the group consisting of hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, hydroxypropylmethyl cellulose phthalate, hydroxypropylmethyl cellulose acetate succinate, carboxymethylethyl cellulose, cellulose acetate phthalate, cellulose acetate trimellitate, and mixtures thereof.
5 . The dosage form of claim 1 wherein said polymer is hydroxypropylmethyl cellulose acetate succinate and said wicking agent is sucrose.
6 . The dosage form of claim 1 having a porosity of at least 75%.
7 . The dosage form of claim 1 wherein said microporous binder has pores with an average diameter of about 10 μm or less.
8 . The dosage form of claim 1 wherein said polymer constitutes at least 30 wt % of said microporous binder.
9 . The dosage form of claim 1 wherein said microporous binder consists essentially of said aqueous-soluble cellulosic polymer and said wicking agent.
10 . A process for preparing a fast disintegrating microporous binder comprising the steps:
(a) forming a single phase liquid feed solution comprising an aqueous-soluble cellulosic polymer, a wicking agent, a first solvent, and a second solvent, said wicking agent being selected from the group consisting of polyols, salts, organics, low-molecular-weight polymers, and mixtures thereof;
(b) causing said feed solution to undergo phase separation to form two phases; and
(c) removing a substantial portion of said first solvent and said second solvent from said two phases to form said microporous binder;
wherein said aqueous-soluble polymer and said wicking agent together comprise at least about 60 wt % of said microporous binder, and wherein said microporous binder has a porosity of at least about 70%.
11 . The process of claim 10 wherein said polymer is soluble in said first solvent, said wicking agent is soluble in said second solvent, and wherein the volatility of said first solvent is greater than the volatility of said second solvent.
12 . The process of claim 10 wherein step (b) is conducted by a method selected from (i) altering the ratio of said first solvent to said second solvent; (ii) cooling the feed solution; and (iii) a combination of (i) and (ii).
13 . The process of claim 10 wherein steps (b) and (c) are conducted by directing said feed solution to a spray-drying apparatus, and atomizing said feed solution into droplets in said spray-drying apparatus.
14 . The process of claim 10 wherein said polymer is selected from the group consisting of hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, hydroxypropylmethyl cellulose phthalate, hydroxypropylmethyl cellulose acetate succinate, carboxymethylethyl cellulose, cellulose acetate phthalate, cellulose acetate trimellitate, and mixtures thereof; and said wicking agent is selected from the group consisting of sucrose, glucose, dextrose, lactose, mannitol, sorbitol, xylitol, and mixtures thereof.
15 . The process of claim 22 wherein said polymer is hydroxypropylmethyl cellulose acetate succinate and said wicking agent is sucrose.