Degradable crosslinking agent

A degradable cross-linking agent, comprising a compound represented by the following formula (1):

• wherein
• n≥0, k≥0, m≥0, p1≥1, p2≥1, and p3≥1;
• R1, R2, and R3 each independently represent a single bond or a C1-C500 hydrocarbon optionally containing a substituent or a heteroatom;
• Q1, Q2, and Q3 each independently represent at least one reactive functional group selected from the group consisting of a hydroxy group, an amino group, a thiol group, a hydrazide group, a carboxylic acid group, an acid anhydride group, a vinyl group, an allyl group, an acrylate group, a methacrylate group, a crotonate group, an isoprenyl group, an acrylamide group, a methacrylamide group, a crotonamide group, an epoxy group, an oxetane group, an oxazoline group, an isocyanate group, a carbodiimide group, a methylol group, a silanol group, a hydroxysilyl group, and an alkoxysilyl group;
• X1a, X1b, X2a, X2b, X3a, X3b, X4a, and X4b each independently represent an oxygen atom, a sulfur atom, a single bond, a C1-C20 hydrocarbon group optionally containing a substituent, or —NB— where B represents a hydrogen atom or a hydrocarbon group, and at least one of X1a, X1b, X2a, X2b, X3a, X3b, X4a, and X4b is an oxygen atom, a sulfur atom, or —NB— where B represents a hydrogen atom or a hydrocarbon group;
• A1 to A8 each represent a carbonyl group or a single bond, at least one of A1 and A2 is a carbonyl group, at least one of A3 and A4 is a carbonyl group, at least one of A5 and A6 is a carbonyl group, and at least one of A7 and A8 is a carbonyl group;
• and
• each Z independently represents a divalent or higher-valent group containing a siloxane structure or a C1-C500 hydrocarbon group optionally containing a heteroatom.