Patent ID: 8691925

Claim:
A neutral layer composition capable upon heating of forming a crosslinked random copolymer neutral layer for directed self assembly of a block copolymer coated on top of the crosslinked neutral layer wherein the neutral layer composition comprises; (i) at least one random copolymer of structure (I) having at least one unit of structure (1), at least one unit of structure (2) and at least one unit of structure (3) where R 1 is selected from the group consisting of a C 1 -C 8 alkyl, C 1 -C 8 fluoroalkyl, C 1 -C 8 partially fluorinated alkyl moiety, C 4 -C 8 cycloalkyl, C 4 -C 8 cyclofluoroalkyl, C 4 -C 8 partially fluorinated cycloalkyl, and a C 2 -C 8 hydroxyalkyl; R 2 , R 3 and R 5 are independently selected from a group consisting of H, C 1 -C 4 alkyl, CF 3 and F; R 4 is selected from the group consisting of H, C 1 -C 8 alkyl, C 1 -C 8 partially fluorinated alkyl moiety and C 1 -C 8 fluoroalkyl, n ranges from 1 to 5, R 6 is selected from the group consisting of H, F, C 1 -C 8 alkyl and a C 1 -C 8 fluoroalkyl and m ranges from 1 to 3, and wherein the neutral layer has unit 1 ranging from about 20 mole % to about 80 mole %; unit 2 ranging from about 20 mole % to about 80 mole % and unit 3 ranging from about 15 mole % to about 45 mole %, and ii) a solvent.