发明授权
US4396766A Process for producing sodium and zinc pyrithione 失效
吡啶硫酮钠和锌的制备方法

Process for producing sodium and zinc pyrithione
摘要:
Disclosed is a process for producing a zinc pyrithione product having an acceptable white or off-white color and containing substantially no undesired 2-hydroxypyridine-N-oxide or metal salt complexes thereof, by(1) making sodium pyrithione by reacting a 2-halopyridine-N-oxide with sodium hydrosulfide and sodium carbonate (or a mixture of sodium carbonate and sodium hydroxide) under selected addition temperatures and reaction temperatures and in selected mole ratios; followed by(2) making zinc pyrithione by reacting the sodium pyrithione with a zinc salt.
公开/授权文献
信息查询
0/0