Two step method for preparation of controlled release formulatio

Details Two step method for preparation of controlled release formulatio Two step method for preparation of controlled release formulatio

1991-01-23

1992-09-08

Lee, Lester L.

Drug, bio-affecting and body treating compositions

Solid synthetic organic polymer as designated organic active...

Polymer from ethylenic monomers only

424 7802, 424 7808, 424 7831, 424484, 424489, 424501, C08J 928

Patent

active

051456753

ABSTRACT:
Active substances intended for topical application are incorporated in novel formulations in which they are retained as impregnants inside the pores of porous solid particles or microspheres. The pores form a continuous network open to the exterior of the particles, permitting outward diffusion of the impregnants at a controlled rate depending on the pore size. The impregnated particles are prepared by impregnation of preformed particles with the active substance.

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