Process for producing sheet for sustainedly releasing volatile drug
US6656303B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2001 |
| Grant date | Dec 2, 2003 |
| Priority date | — |
| Expiry date | Dec 5, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2307/724
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for producing a sheet for sustained release of a volatile drug, characterized by dissolving a resin serving as an adhesive in a volatile drug and using the resultant solution as a coating fluid to bond a film permeable to the volatile drug to another film permeable or impermeable to the volatile drug. No organic solvent or peeling film for process is used, accordingly, unlike the so far known process. Consequently, it is not necessary to provide the drying step for removing an organic solvent as well as any thermal energy. As a result, the number of production steps can be reduced considerably. In addition, since the volatile drug is homogeneously diluted in the adhesive, the volatile drug can be incorporated accurately and evenly even in an amount as small as 1 g/m2 or less. According to the process of the invention, a thinner layer containing a volatile drug can be formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.