Dermatological patch and process for producing thereof
US6267983A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 11, 1999 |
| Grant date | Jul 31, 2001 |
| Priority date | — |
| Expiry date | Aug 11, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2556/00
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A transdermal patch which comprises: a substrate sheet comprises a composite film formed of a resin composition comprising 100 parts by weight of a polyvinyl chloride-polyurethane composite and 2-10 parts by weight of a styrene-ethylene-butylene-styrene copolymer, a first adhesive layer on the one side of the composite film, and a polyalkylene terephthalate film adhered to the one side of the composite film by means of the first adhesive layer, a primer layer which comprises a saturated polyester resin and is formed on the surface of the polyalkylene terephthalate film; and a second adhesive layer comprising a styrene-diene-styrene block copolymer containing a pharmaceutical agent layered on the primer layer. A method for the manufacture of the above-mentioned substrate sheet comprises preparing the above resin composition molding the resin composition into a composite film by a calendar process, and then adhering a polyalkylene terephthalate film on one side of the composite film by means of an adhesive layer thereby forming the substrate sheet, and forming a primer layer comprising a saturated polyester resin on the outer surface of the polyalkylene terephthalate film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.