Patent ID: 7429627

Claim:
A ferroelectric film precursor composition, comprising a ferroelectric polymer or prepolymer, a casting solvent, and a leveling agent comprising a (meth)acrylic copolymer represented by formula (I): wherein each R 1 is independently a hydrogen or methyl group, A is —CR 3 R 4 R 5 , wherein each R 3 is independently a hydrogen, substituted or unsubstituted C 1 -C 20 linear or branched chain alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, aryl, alkaryl, aralkyl, or heteroaryl moiety, and each R 4 and R 5 is independently a hydrogen, substituted or unsubstituted C 1 -C 20 linear or branched chain linear or branched chain alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, aryl, alkaryl, aralkyl, or heteroaryl moiety or R 4 and R 5 together form a C 3 -C 8 cycloalkyl group, with the proviso that when R 4 and R 5 are each hydrogen, R 3 is not a linear alkyl group; R 2 comprises a substituted or unsubstituted C 1 -C 20 linear or branched chain linear or branched chain alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, aryl, alkaryl, aralkyl, or heteroaryl moiety, wherein the substituents on R 2 , R 3 , R 4 , and R 5 may be halogen, hydroxyl, cyano, nitro, C 1 -C 12 alkyl carboxy ester, acyl, C 1 -C 12 alkoxy, carboxylate, or a mixture comprising one or more of the foregoing groups; x+y+z= 100 mol %; x and y are each independently 10 to 70 mol %; and z is less than or equal to 40 mol %.