Patent ID: 6929891

Claim:
A heat resistant negative working photosensitive composition that comprises (a) one or more polybenzoxazole precursor polymers (I): wherein x is an integer from about 10 to about 1000, y is an integer from 0 to about 900 and (x+y) is about less then 1000; Ar 1 is selected from the group consisting of a tetravalent aromatic group, a tetravalent heterocyclic group, or mixtures thereof; Ar 2 is selected from the group consisting a divalent aromatic, a divalent heterocyclic, a divalent alicyclic, a divalent aliphatic group that may contain silicon, or mixtures thereof; Ar 3 is selected from the group consisting a divalent aromatic group, a divalent aliphatic group, a divalent heterocyclic group, or mixtures thereof; Ar 4 is selected from the group consisting Ar 1 (OH) 2 or Ar 2 ; G is an organic group selected from the group consisting of groups having a carbonyl, carbonyloxy or sulfonyl group attached directly to the terminal NH group of the polymer; (b) one or more photo-active compounds which release acid upon irradiation (PAGs); (c) a latent crosslinker which contains at least two ˜N—(CH 2 OR) n units wherein n=1 or 2 and R is a linear or branched C 1 -C 8 alkyl group, with the proviso that when a glycoluril is employed as the latent crosslinker, the G group in the polybenzoxazole precursor polymer is produced from the reaction of a cyclic anhydride; and (d) at least one solvent that is not NMP.