Patent ID: 8257598

Claim:
A method for making a nanoimprinting mold, the method including the use of a block copolymer having a bulk period L 0 and comprising: forming on a substrate having a center a pattern of generally radial stripes arranged in an annular band, the stripes having a circumferential spacing at the outside diameter (OD) of the annular band greater than at the inside diameter (ID) of the annular band, said circumferential spacings at said OD and said ID being approximately nL 0 , where n is an integer equal to or greater than 2; and depositing on the patterned substrate a layer of material comprising a block copolymer having a bulk period L 0 , whereby the copolymer material is guided by the stripes to self-assemble into generally radial lines of alternating first and second copolymer components, the radial lines of each component having a circumferential spacing at the outside diameter (OD) of the annular band greater than at the inside diameter (ID) of the annular band, said circumferential spacings of the radial lines at said OD and said ID being approximately L 0 .