Structure
AssigneeNitto Denko Corporation
InventorYohei MAENO
Life of this patent
Estimating the term…
Abstract
The present invention provides a structure suitable for controlling the release quantity of an active ingredient in a state where the structure is in contact with skin. A structure 10 according to the present invention includes a retention part 1 that retains an active ingredient, and a release control layer 3 that controls release of the active ingredient to an outside. In the structure 10, at least one of the following conditions holds: i) the release control layer 3 includes a microporous membrane having an average pore diameter of 0.01 μm or less; and ii) the release control layer 3 is a nanofiltration membrane or a reverse osmotic membrane.
Claims18
A structure comprising a retention part that retains an active ingredient, and a release control layer that controls release of the active ingredient to an outside, wherein
- at least one of the following conditions holds:
- i) the release control layer includes a microporous membrane having an average pore diameter of 0.01 μm or less;
- and
- ii) the release control layer is a nanofiltration membrane or a reverse osmotic membrane.
A structure comprising a retention part that retains an active ingredient, and a release control layer that controls release of the active ingredient to an outside, wherein
- the release control layer has a molecular weight cutoff of 20000 or less.
A structure comprising a retention part that retains an active ingredient, and a release control layer that controls release of the active ingredient to an outside, wherein
- a releasing speed at which the active ingredient is released per area of 1 cm2 of a principal surface of the release control layer is less than 0.39 μg/hour in a state where no pressure is applied to the retention part from the outside, and
- the releasing speed at which the active ingredient is released per area of 1 cm2 of the principal surface of the release control layer is 0.39 μg/hour or more in a state where a pressure is applied to the retention part from the outside in such a manner as to transmit a pressure of 0.15 MPa to the principal surface of the release control layer.
Dependencies are inferred from the claim text.