90  US 7,851,130 B2  89  -continued  -continued  Acid Crosslinking Agent (E) Capable of Crosslinking with  the Alkali-Soluble Resin by the Action of an Acid:  Hereinafter also referred to as "component (E)" or "a  crosslinking agent".  A crosslinking agent is used in the negative photosensitive  composition of the invention.  Every compound capable of crosslinking the resins soluble  in an alkali developing solution by the action of an acid can be  used as crosslinking agents, but the following (1) to (3) are  preferably used.  (1) A hydroxymethyl material, an alkoxymethyl material and  an acyloxymethyl material of phenol derivatives,  (2) Compounds having an N-hydroxymethyl group, an  N-alkoxy-methyl group, or an N-acyloxymethyl group, and  (3) Compounds having an epoxy group.  The alkoxymethyl group preferably has 6 or less carbon  atoms, and the acyloxymethyl group preferably has 6 or less  carbon atoms.  Of these crosslinking agents, particularly preferred com› pounds are shown below.  OH  OH  ~mo+B"  HO  HO  OH  OH  OH  OH  Ls  OH  OH  OH  OH  OH  OH 