Patent ID: 7402373
Filing Date: 2008-07-22
Classification: G03F

Abstract:
1. A process for fabricating an electronic device that comprises a substrate, comprising: (a) forming a protective layer on a first side of the substrate from a composition that comprises; (i) a UV blocking agent selected from the group consisting of 2 hydroxyl aryl benzotriazole and its derivatives, and 2 hydroxy benzophenone and its derivatives; and (ii) a polymer in which at least 50 mole percent of the monomers in the polymer comprise one or more of the structures (i), (ii) and (iii) described as follows: where R 1 is hydrogen or lower alkyl; R 2 is a lower alkyl; and R 3 is hydrogen or a lower alkyl, where the definition of lower alkyl includes alkyl groups having 1 to 6 linear or cyclic carbon atoms; where R 1 is hydrogen or lower alkyl; R 2 is a lower alkyl; and R 3 and R 4 are independently hydrogen or a lower alkyl, where the definition of lower alkyl includes alkyl groups having 1 to 6 carbon atoms and the joining of R 1 and R 2 , or R 1 and either R 3 or R 4 , or R 2 and either R 3 or R 4 to form a 5-, 6-, or 7-membered ring; and where R 1 is hydrogen or lower alkyl; R 2 is a lower alkyl; and R 3 and R 4 are independently hydrogen or a lower alkyl; where the definition of lower alkyl includes alkyl groups having 1 to 6 carbon atoms and the joining of R 1 and R 2 , or R 1 and either R 3 or R 4 , or R 2 and either R 3 or R 4 to form a 5-, 6-, or 7-membered ring; and where n is 0 to 4; (b) irradiating the protective layer through a mask; (c) heating the device; (d) contacting the protective layer with a developing solution to remove the portions of the protective layer composition exposed to radiation in step (b), and thereby form a patterned protective layer; (e) irradiating the patterned protective layer; (f) heating the device; (g) applying to the patterned protective layer a paste composition; (h) irradiating the device from a second side of the substrate to form a pattern in the paste composition; and (i) contacting the paste composition and the patterned protective layer with a developing solution to remove (I) the portions of the paste composition not exposed to radiation in step (h), and (II) the patterned protective layer.