| 摘要 |
<p>The invention concerns a composition including a core with a catalytic substance for decomposition of hydrogen peroxide to oxygen and water. The composition is characterized by that the core is surrounded by a membrane, which is expandable in aqueous medium and which comprises of a water insoluble polymer and a water soluble porecreating substance, which is randomly distributed in the polymer, whereby the membrane permeability for the catalitic substance increases concurrently with the expansion of the membrane in the aqueous medium.</p> |
