Spin-on-dielectric compositions with coating enhancer

A composition suitable for coating to form thin films comprising:

• (a) less than 40 percent by weight based on total weight of the composition of a polymer or oligomer which is soluble or dispersible in organic solvents, said polymer or oligomer is characterized in that it has a dielectric constant less than 4.0 or it is curable to form a cured polymer having a dielectric constant less than 4.0;
• (b) a solvent system having at least a first solvent and a second solvent, wherein the first solvent has a higher vapor pressure than the second solvent and
• (c) a polymeric coating additive in amounts less than about 1000 parts by weight per one million parts by weight of total composition, wherein the coating additive is soluble in the first solvent but phase separates to form a substantially contiguous fluid phase in the second solvent.

A composition suitable for coating to form thin films comprising:

• (a) less than 40 percent by weight based on total weight of the composition of a polymer or oligomer, which is soluble or dispersible in organic solvents said polymer or oligomer is characterized in that it has a dielectric constant less than 4.0 or it is curable to form a cured polymer having a dielectric constant less than 4.0;
• (b) a solvent system, comprising at least one organic solvent and
• (c) a polymeric coating additive in amounts less than about 1000 parts by weight per one million parts by weight of total composition, wherein the coating additive is the group consisting of polyisoprenes, polybutenes, polybutadiene, hydrogenated polystyrenes, hydrogenated polystyrene/indene resins, poly(styrene-b-ethylene-co-propylene), and acrylate polymers and copolymers.