| 摘要 |
[Problem] Copper pyrithione which has been worldwide recognized as a major antifouling agent for a ship bottom paint has two problems to be solved in the future. One of the problems is to develop, from the standpoint of marine environment protection, a product having such a shape as can inhibit the antifouling agent from being eluted from a coating film and thereby prolong the duration of antifouling effect, while the other is to develop a particulate product which suffers from little dusting and thus can enhance the safety at a working site. [Solution] The present inventors have succeeded in obtaining a copper pyrithione assembly which consists of cylindrical or flaky small particles, unlike conventional copper pyrithione needle crystals, by using a composite salt composed of both an inorganic copper (II) salt and an inorganic ammonium salt instead of an inorganic copper (II) salt which is used as a raw material in a conventional copper pyrithione manufacturing process. As a result, the present inventors have found that: copper pyrithione assembly particles which mainly have spherical or ellipsoidal shapes and have a mean particle diameter of 5.5 to less than 9μm can be inhibited from being eluted into seawater from a ship bottom antifouling paint; and the copper pyrithione assembly partilces can reduce the risk of dust absorption at a working site. Thus, the problems have been solved. |
