Support film for tape material, and tape material

An adhesive tape material, wherein:

• the adhesive tape material comprises a support film for the tape material,
• the support film comprises a film-shaped support formed of polyurethane,
• the support film further comprises a barrier layer formed on one surface of the support,
• the adhesive tape material further comprises an overcoat layer comprises polyvinyl alcohol and titanium lactate on the barrier layer of the support film,
• the barrier layer consisting essentially of:
• an aromatic isocyanate-based polyurethane, the aromatic isocyanate-based polyurethane being a water-based polyurethane, which is made in aqueous conditions, formed of isocyanate including an aromatic group on a main chain or side chain and polyol;
• a synthetic mica having an average particle diameter of 11 μm or more;
• and
• a glycerin, and
• the adhesive tape material further comprises an adhesive layer formed on the overcoat layer,
• wherein an aspect ratio of the synthetic mica is 1000 or greater,
• wherein the synthetic mica comprises a plurality of flat structures, and the flat structures are stacked,
• wherein an amount of the glycerin is within a range of from 10 wt % to 15 wt % with respect to a total amount (100 wt %) of the aromatic isocyanate-based polyurethane and the synthetic mica,
• wherein the total amount (100 wt %) is from 20 wt % of the synthetic mica and 80 wt % of the aromatic isocyanate-based polyurethane to 10 wt % of the synthetic mica and 90 wt % of the aromatic isocyanate-based polyurethane,
• wherein a water vapor permeability rate of a first support film constituted of the support film and the overcoat layer is smaller than a water vapor permeability rate of the support film, and
• wherein the adhesive layer comprises a drug and an absorption rate of the drug into a skin is configured to be enhanced by an effect of occlusive dressing therapy (ODT).