Film coatings and film coating compositions based on polyvinyl alcohol
US6448323B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1999 |
| Grant date | Sep 10, 2002 |
| Priority date | — |
| Expiry date | Jul 9, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/521
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A dry film coating composition for use in coating pharmaceutical tablets, nutritional supplements, food, confectionery forms, agricultural seeds, and the like, comprises polyvinyl alcohol, a plasticizer such as polyethylene glycol or glycerin, talc, and preferably a pigment/opacifier and lecithin. A method of coating substrates such as pharmaceutical tablets, nutritional supplements, food, confectionery forms, agricultural seeds, and the like, with a film coating, comprises the steps of mixing polyvinyl alcohol, a plasticizer such as polyethylene glycol or glycerin, talc, and preferably a pigment/opacifier and lecithin into water to form an aqueous coating dispersion, applying an effective amount of said coating dispersion onto said substrates to form a film coating on said substrates, and drying the film coating on said substrates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.