Patent ID: 6153107
Filing Date: 2000-11-28
Classification: G03F

Abstract:
A process for treating a waste liquor comprising a photosensitive resin and an anionic surface active agent, said process comprising the steps of:a) providing an apparatus which comprises a waste liquor treatment tank equipped with a heating means, stirring means, an ultraviolet irradiating means and a filtering means;b) treating the waste liquor to diminish the efficacy of the anionic surface active agent, wherein treating the waste liquor comprises adding a flocculating agent, thereby separating the resin from the waste liquor;c) irradiating the treated waste liquor with ultraviolet light having a wavelength of about 300 to 400 nanometers, whereby the resin in development waste liquor is cured and solidified; andd) removing the solidified resin.