MULTILAYER PREPARATION WHICH GRADUALLY RELEASES LIQUID ACTIVE AGENT

摘要

The invention relates to a multilayer preparation (1) which gradually releases a liquid active agent, in which a release layer (3) composed of a polymer compatible with said liquid active agent is provided on at least one side of a liquid active agent-containing active layer (2) and barrier layers (4) are provided on both sides of the assembly of layer (2) and layer (3). This preparation releases the liquid active agent from the release layer (3) into the air at a substantially constant rate and, since barrier layers (4) are provided, it is not adversely affected by wind even when used outdoors.