| 摘要 |
A water-soluble substrate (10), and more particularly a water-soluble sub strate that is resistant to contact with small amounts of water, and methods of making the same are disclosed. At least one of the substrate's surfaces (12, 14) comprises first discrete zones (20) having a water- solubility whic h is less than the water-solubility of said water-soluble substrate. The fir st discrete zones (20) represent from 10% to 90% of the surface area of said first or second surface. |
