| abstract |
The present invention relates to a composition comprising components (a), (b) and (c). The component (a) is a block copolymer or a blend of block copolymers. The component (b) is a low Tg additive selected from the group consisting of an oligo random oligo random copolymer (b-1), an oligo diblock copolymer (b-2), an oligo diblock copolymer (b-3) and a mixture of at least two of these. The component (c) is a spin casting organic solvent. The invention also pertains to the use of said compositions in directed self-assembly. The invention further pertains to the novel oligo diblock copolymer (b-2) which is an oligo diblock copolymer of block (A-b) and block (B-b), wherein block (A-b) is a random copolymer of repeat units having structures (III), and (IV) and block (B-b) is a random copolymer of repeat units having structures (V), and (VI). |