| abstract |
This invention is for a positive working, light sensitive composition useful for diverse applications such as metal plating and etching of metal, ceramics and the like, in a pattern, for example, in chemical milling or in the manufacture of printed circuit boards. Light sensitive compositions of the invention comprise (1) a major portion of a resin system having as principal ingredients, a carboxyl type acrylic resin and an acrylamide as a modifier and (2) a minor portion of at least one positive working, light sensitive diazo compound. By use of the acrylamide modifier in combination with the acrylic resin, there is provided a thick resist coating having improved photochemical properties and improved chemical resistance, especially to acid. |