HEAT-STABLE CRYSTAL MODIFICATION OF DYE, PROCESS FOR THE PREPARATION OF THE SAME, AND PROCESSES FOR DYEING HYDROPHOBIC FIBERS WITH THE SAME
申请人:NIPPON KAYAKU CO., LTD.
公开号:EP0826744A1
公开(公告)日:1998-03-04
This invention related to a novel β-crystal of the compound represented by the following formula (1),
which is useful as a dyestuff. The β-crystal of this invention is characterized by being stable in high temperature and having sharp peaks in the powder X-ray diffractometory.
This invention is related to a process for producing a said β-crystal, said process comprising heating a known thermally unstable α-crystal at a temperature higher than 15°C, prefarablly higher than 40°C in water, a water-soluble organic solvent, or a solvent comprising water containing an anionic or nonionic surface active agent.
Furthermore, this invention is related to a dyestuff composition cotaining of the said β-crystal, and a process for dyeing comprising employing the said β -crystal.
本发明涉及下式(1)所代表化合物的新型 β 晶体、
它可用作染料。本发明的 β 晶体的特点是在高温下稳定,在粉末 X 射线衍射计中有尖锐的峰。
本发明涉及一种生产上述 β 晶体的工艺,该工艺包括在温度高于 15℃(最好高于 40℃)的水中、水溶性有机溶剂 中或由含有阴离子或非离子表面活性剂的水组成的溶剂中加热已知的热不稳定 α 晶体。
此外,本发明还涉及一种含有上述 β 晶体的染料组合物,以及一种使用上述 β 晶体的染色工艺。