Patent ID: 11971660
Assignee: MARUZEN PETROCHEMICAL CO., LTD.
Field: Optics (Instruments)
Classification: CPC G  C | IPC C  G

Claim 0:
1. A cross-linked polymer for a resist whose solubility against a developing solution varies by the action of an acid, comprising a structure wherein at least a portion of phenolic hydroxyl groups in the polymer is protected by a group represented by the following formula (1):, wherein R1 represents an alkyl group having 1 to 5 carbons and n represents an integer from 1 to 5; and * represents a bond part of the phenolic hydroxyl group to a residue other than a hydrogen atom, and
a structure wherein at least a portion of phenolic hydroxyl groups in the polymer is protected by a group represented by the following formula (2):, wherein R2 represents a divalent saturated hydrocarbon group having 2 to 17 carbons, optionally containing an alicyclic ring group or a divalent hydrocarbon group having 6 to 17 carbons, containing an aromatic ring; and * represents a bond part of the phenolic hydroxyl group to a residue other than a hydrogen atom, and the polymers are cross-linked to each other.