Patent ID: 6576409
Filing Date: 2003-06-10
Classification: G03F,H05K

Abstract:
A method for forming a resist pattern, comprising:a step of applying to a substrate a photosensitive resin composition comprising (A) a resinous compound containing an acid-decomposing ester group and possessing a weight average molecular weight in the range of 1,000 to 50,000, (B) a compound containing one ethylenically unsaturated bond in its molecule and possessing a group capable of forming a carboxylic acid via decomposition by the action of an acid, (C) a compound capable of generating an acid by exposure to an active energy ray, and (D) a photo-radical polymerization initiator, a primary exposure step of irradiating the applied layer with an active energy ray of a wavelength enough to activate said photo-radical polymerization initiator (D) and not enough to activate said compound (C) thereby radically polymerizing said compound (B) and consequently forming a tack-free coating film, a selective secondary exposure step of selectively irradiating said tack-free coating film with an active energy ray of a wavelength enough to activate said compound (C) thereby decomposing said compound (C) present in the irradiated part and inducing generation of an acid, a heating step for heating the coating film resulting from said selective secondary exposure step thereby decomposing said resinous compound (A) and the polymer of said compound (B) which are present in said part subjected to said selective secondary exposure and rendering the coating film in said part soluble in an aqueous alkaline solution, and a step of developing said coating film with an aqueous alkaline solution subsequently to said heating step thereby removing the part of said coating film subjected to said selective secondary exposure.