Patent · US Expired

Flexible, hydrophilic gel film, the process for its production and the use of it

US5456745A · kind A · utility

179Cited by

3References

10Claims

0Family size

Assignee

LTS Lohmann Therapie-Systeme GmbH Co. KG · DE

Inventors

Michael Roreger · Neuwied, DE
Fritz Herrmann · Rodgau, DE
Hans-Rainer Hoffmann · Neuwied, DE
Harald List · Neuwied, DE

Key dates

Filing date	Aug 11, 1989
Grant date	Oct 10, 1995
Priority date	—
Expiry date	Aug 11, 2009

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2300/10
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

A flexible, hydrophilic, water-swellable but insoluble gel film which consists of PA1 (a) 0.5 to 30%-wt of at least one water-soluble polymer being anion-active at neutral pH PA1 (b) 0.5 to 50%-wt of at least one water-soluble polymer being cation-active at neutral pH PA1 (c) 0.1 to 20%-wt of at least one moisturizer PA1 (d) 0.1 to 70%-wt of water PA1 (e) 0 to 75%-wt of water-soluble or water-dispersible auxiliaries PA1 (f) 0 to 50%-wt of active substance a process for its production and the use of this film for the production of a device creating interactions between the gel film and a solid, liquid, or gaseous substrate.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.