SEEN FROM AN OUTSIDE DISPOSAL OF LIGHT-ENSIBLE AND HEALTH-RELATED POLYVINE COLOLING MATERIAL AND COMPOSITION FOR RECOVERY OF THE SET

摘要

1375402 Aqueous solutions for removing a hardened photoresist HOWSON-ALGRAPHY Ltd 19 Jan 1972 [25 Jan 1971]. 3122/71 Heading C5D [Also in Divisions G2 and B6] A layer of light-sensitized (polyvinyl alcohol) - containing material which has become insolubilized is removed by treating with an aqueous solution containing periodate ions and optionally a bleaching agent and then rubbing the layer. Exemplified aqueous solutions contain potassiummetaperiodate and either (a) sodium tripoly-phosphate and sodium hypochlorite or (b) sodium dichloroisocyanurate.