Arylcyclobutenes

A dry film structure comprising a support sheet;

• a layer of a polymer on the support sheet, the polymer comprising polymerized units of one or more monomers of formula (1)
• wherein each A is independently chosen from CR3R4—O—, —C(═O)O—, and C(═O)NH—;
• each B is independently chosen from —CR3R4— and —C(═O)—;
• each R is independently chosen from halo, cyano, hydroxy, carboxy, C1-6 alkoxy, C1-6 alkyl, C1-6 haloalkyl, C2-6 alkenyl, carboxy C1-6 alkyl, —(C═O)—C1-6 alkyl, -G-(C═O)—C1-6 alkyl, —(C═O)-G-C1-6 alkyl, —O—C4-20 aryl, —(C═O)—C4-20, aryl, -G-(C═O)—C4-20 aryl, and —(C═O)-G-C4-20 aryl;
• each of R1, R2, R3 and R4 is independently chosen from H, C1-10 alkyl, C2-10 alkenyl, C2-10 alkynyl, and C4-15 aryl;
• Z is an organic radical having 2 to 50 carbon atoms;
• G is O or N(R′)2;
• each R′ is independently chosen from H, C1-6 alkyl, C4-10 aryl, and C7-15 aralkyl;
• x is the number of R groups and is an integer of from 0 to 2;
• m is an integer of from 1 to 6;
• n is an integer of from 0 to 5;
• and m+n=3 to 6;
• and a cover sheet on the polymer layer.