Patent ID: 7517466

Claim:
A method for forming a pattern comprising: on a substrate, forming a film comprised of a pattern forming material; wherein the pattern forming material comprises a block copolymer or graft copolymer comprising; a polymer chain selected from the group consisting of a polyacrylonitrile chain, a polyacrylonitrile derivative chain, a polycyclohexadiene derivative chain, a polybutadiene chain, a polysilane chain, polysiloxane chain, a polyamic acid chain and a polyaniline derivative chain; and a thermally decomposable polymer chain; forming a microphase-separated structure in the film, the microphase-separated structure comprising a thermally decomposable polymer phase and a remaining polymer phase; removing the thermally decomposable polymer phase from the microphase-separated structure by heating said film to a thermal decomposition temperature or more, to form a pattern of the microphase-separated structure; and transferring the pattern of the microphase-separated structure to the substrate by etching the substrate using the remaining polymer phase in the film as a mask.