Patent ID: 8105952

Claim:
A pattern forming method comprising: forming a layer comprising a composition above a substrate, the composition containing a diblock copolymer which can be phase-separated into a first phase and a second phase exhibiting higher etching resistance than the first phase, the first phase containing a first component and the second phase containing a second component; subjecting the diblock copolymer to phase separation to obtain a phase-separated layer, thereby forming an easy-to-etch region constituted by the first component and having a cylindrical or lamellar configuration extending in a first direction; forming an imprinting resist layer on the phase-separated layer; subjecting the imprinting resist layer to imprinting work using a mask pattern to form, on the imprinting resist layer, an uneven pattern extending in a second direction intersecting with the first direction and including projections and recesses; selectively removing, from the imprinting resist layer, the resist left remaining on a bottom of each of the recesses of the uneven pattern, thereby leaving only the resist constituting the projections and, at the same time, selectively removing the first component from the phase-separated layer to obtain an etching resistive pattern containing the second component; and etching the substrate using, as a mask, not only the projections of the imprinting resist layer but also the etching resistive pattern containing the second component.