Patent ID: 6260956
Filing Date: 2001-07-17
Classification: B41J

Abstract:
An ink jet printhead which comprises (i) an upper substrate with a set of parallel grooves for subsequent use as ink channels and a recess for subsequent use as a manifold, the grooves being open at one end for serving as droplet emitting nozzles, and (ii) a lower substrate in which one surface thereof has an array of heating elements and addressing electrodes formed thereon, said lower substrate having an insulative layer deposited on the surface thereof and over the heating elements and addressing electrodes and patterned to form recesses therethrough to expose the heating elements and terminal ends of the addressing electrodes, the upper and lower substrates being aligned, mated, and bonded together to form the printhead with the grooves in the upper substrate being aligned with the heating elements in the lower substrate to form droplet emitting nozzles, said upper substrate comprising a material formed by crosslinking or chain extending a polymer of the formula ##STR90##wherein x is an integer of 0 or 1, P is a substituent which imparts photosensitivity to the polymer, a, b, c, and d are each integers of 0, 1, 2, 3, or 4, provided that at least one of a, b, c, and d is equal to or greater than 1 in at least some of the monomer repeat units of the polymer, A is ##STR91##or mixtures thereof, B is ##STR92##wherein v is an integer of from 1 to about 20, ##STR93##wherein z is an integer of from 2 to about 20, ##STR94##wherein u is an integer of from 1 to about 20, ##STR95##wherein w is an integer of from 1 to about 20, ##STR96##or mixtures thereof, and n is an integer representing the number of repeating monomer units.