COMPOSITION FOR ENTERIC HARD CAPSULE AND ENTERIC HARD CAPSULE PREPARED USING THE COMPOSITION
A composition for enteric hard capsules and an enteric hard capsule prepared using the composition. The composition includes a water-soluble divalent base and an alkaline agent. The enteric hard capsule has high transparency and delaying effects of separation of salt during storage.
1 . A composition for enteric hard capsules, the composition comprising:
50 to 90 parts by weight of hydroxypropyl methylcellulose phthalate (HPMCP);
10 to 50 parts by weight of hydroxypropyl methylcellulose (HPMC);
0.1 to 2.5 parts by weight of a water-soluble divalent base; and
3.5 to 7.5 parts by weight of an alkaline agent,
wherein the amounts of the HPMCP, the HPMC, the water-soluble divalent base, and the alkaline agent in parts by weight are based on 100 parts by weight of the total weight of the HPMCP and the HPMC.
2 . The composition of claim 1 , wherein the HPMCP comprises 20 to 24 wt % of a methoxy group, 6 to 10 wt % of a hydroxypropoxy group, and 21 to 26 wt % of a phthalyl group, and has a kinetic viscosity of 48 cSt to 66 cSt.
3 . The composition of claim 1 , wherein the water-soluble divalent base comprises calcium hydroxide.
4 . The composition of claim 1 , wherein the alkaline agent comprises at least one selected from the group consisting of ammonia, sodium hydroxide, and potassium hydroxide.
5 . The composition of claim 1 , further comprising 1 to 15 parts by weight of a plasticizer based on 100 parts by weight of the total weight of the HPMCP and the HPMC.
6 . The composition of claim 5 , wherein the plasticizer comprises at least one selected from the group consisting of hydrogenated corn syrup, triethyl citrate (TEC), triacetin (TA), polyethylene glycol (PEG), and propylene glycol (PG).
7 . The composition of claim 1 , further comprising 0.05 to 0.5 parts by weight of an emulsifier based on 100 parts by weight of the total weight of the HPMCP and the HPMC.
8 . The composition of claim 7 , wherein the emulsifier comprises at least one selected from the group consisting of sodium lauryl sulfate (SLS) and sugar ester (SE).
9 . The composition of claim 1 , further comprising water, wherein a ratio (Ww/Wm) of the amount of water (Ww) to the total amount of the HPMCP and the HPMC (Wm) may be in a range of 75 to 85 parts by weight/15 to 25 parts by weight.
10 . An enteric hard capsule prepared using the composition according to claim