Patent ID: 7098267

Claim:
A polyamic acid varnish composition, comprising: a polyamic acid obtained by addition polymerization of an aromatic diamine and an aromatic acid dianhydride; and a solvent; wherein: the polyamic acid varnish composition comprises an imidazolyl-diaminoazine as an additive; the imidazolyl-diaminoazine is present in the polyamic acid varnish composition in an amount of from 0.1 to 10 wt parts per 100 wt parts of the polyamic acid; and the imidazolyl-diaminoazine is selected from the group consisting of: 2,4-diamino-6-[1-(2-undecyl-1-imidazolyl)ethyl]-s-triazine; 2,4-diamino-6-[2-(2-imidazolyl)ethyl]-s triazine; 2,4-diamino-6-[2-(1-imidazolyl)ethyl]-s-triazine; 2,4-diamino-6-(2-ethyl-4-imidazolyl)-s-triazine; 2,4-diamino-6-[2-(4-methyl-1-imidazolyl)ethyl]-s-triazine; 2,4-diamino-6-(2-ethyl-5-methyl-4-imidazolyl)-s-triazine; 2,4-diamino-6-(4-ethyl-2-methyl-1-imidazolyl)-s-triazine; 2,4-diamino-6-[3-(2-methyl-1-imidazolyl)propyl]-s-triazine; 2,4-diamino-6-[4-(2-imidazolyl)butyl]-s-triazine; 2,4-diamino-6-[2-(2-methyl-1-imidazolyl)propyl]-s-triazine; 2,4-diamino-6-[1-methyl-2-(2-methyl-1-imidazolyl)ethyl]-s-triazine; 2,4-diamino-6-[2-(2,5-dimethyl-1-imidazolyl)ethyl]-s-triazine; and 2,4-diamino-6-[2-(2,4-dimethyl-1-imidazolyl)ethyl]-s-triazine.