Thermo-oxidatively stable, side chain polyether functionalized polynorbornenes for microelectronic and optoelectronic devices and assemblies thereof

A microelectronic or optoelectronic device comprising one or more of a redistribution layer (RDL) structure, a chip stack structure, a CMOS image sensor dam structure, where said structures further comprise a positive tone, self imagable composition, which contains a thermo-oxidatively stabilized polymer having repeating units derived from a norbornene-type monomer in accordance with Formula A:

• where s is selected from 0 to 3, t is 2, u is an integer from 1 to 3 and R5 is selected from methyl, ethyl, n-propyl or i-propyl, and an additive package comprising one or more phenolic antioxidant selected from the group consisting of:
• 2,2′-((2-hydroxy-5-methyl-1,3-phenylene)bis(methylene))bis(4-methylphenol),
• 6,6′-methylenebis(2-(2-hydroxy-5-methylbenzyl)-4-methylphenol),
• 6,6′-2-hydroxy-5-methyl-1,3-phenylene)bis(methylene)bis(2-(2-hydroxy-5-methylbenzyl)-4-methylphenol),
• 6,6′-methylenebis(2-(2-hydroxy-3,5dimethylbenzyl-4-methylphenol), and
• 6,6′-(2-hydroxy-5-methyl-1,3-phenylene)bis(methylene)bis(2,4-dimethyphenol);
• and
• one or more diaryl amine synergist selected from the group consisting of:
• N,N′-di-2-naphthyl-p-phenylenediamine,
• bis(4-(tert-butyl)phenyl)amine,
• bis(4-(2-phenylpropan-2-yl)phenyl)amine,
• bis(4-(2,4,4-trimethylpentan-2-yl)phenyl)amine and
• bis(4-(2,4,4-trimethylpentyl)phenyl)amine;
• and wherein each of said antioxidant and amine synergist is present in an amount from 3 to 10 parts per hundred parts of said polymer.