Process for coating tablets with aqueous resin dispersions
US3935326A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1974 |
| Grant date | Jan 27, 1976 |
| Priority date | — |
| Expiry date | Apr 22, 1994 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K9/2893
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Coated tablets are prepared by applying to a core of active material, at least one layer of a coating composition made up of a film forming aqueous synthetic resin dispersion and from 2-50% by weight of a water or alkaline soluble material and thereafter permitting the coating composition layer to dry. The resulting coated tablet has a core surrounded by a continuous porous matrix of synthetic resin formed from the aqueous dispersion which is insoluble in water and insoluble in the gastrointestinal tract. The pores of the continuous resin matrix are filled with a discontinuous particulate material which is water or alkaline soluble. The coated tablet initially is air and moisture tight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.