Patent ID: 8883400

Claim:
A composition suitable for use in forming a topcoat layer over a layer of photoresist, the composition comprising: a first matrix resin comprising one or more acidic functional groups; a second additive resin that is different from and substantially immiscible with the first resin, the second resin comprising as polymerized units a monomer of the formula (I): wherein R 1 is hydrogen or a C1 to C6 optionally substituted alkyl or fluoroalkyl group, R 2 is an optionally substituted cycloalkyl or branched alkyl group, R 3 is an optionally substituted alkylene group and R 4 and R 5 are independently C1 to C4 fluoroalkyl groups; wherein the second resin has a lower surface energy than a surface energy of the first resin; and a mixture of solvents effective to achieve phase separation of the additive resin from other resin(s) in the composition during spin-coating.