The crosslinking agent, also known as the bridging agent, is an important component of the polyhydrocarbon photoresist. The photochemical curing of the photoresist depends on the crosslinking agent with the dual photosensitive functional group to participate in the reaction. After exposure of the cross-linking agent, a double radical is generated, which interacts with the polyhydrocarbon resin to form a bridge bond between the polymer molecular chains and becomes a three-dimensional structure of insoluble matter.

Often a substance containing a plurality of functional groups in a molecule, such as an organic dibasic acid, a polyhydric alcohol, or the like; or a compound having a plurality of unsaturated double bonds in the molecule, such as divinylbenzene and diisocyanate, N, N-methylene Bis-acrylamide (MBA) and the like. Can be charged together with the monomer, to be polycondensed (or polymerized) to a certain extent, cross-linking, so that the product becomes insoluble cross-linked polymer; also can retain a certain number of functional groups (or double bonds) in the online molecule, and then join Specific substances are crosslinked, such as curing of phenolic resin and vulcanization of rubber.

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