Resin composition for forming fine pattern and method for forming fine pattern

1. A resin composition for forming fine patterns comprising a resin which is not soluble in water, but soluble in alcohol, containing a hydroxyl group, a crosslinking component, and a solvent, capable of miniaturizing a resist pattern formed by a resist material by applying the composition to the resist pattern causing the resist pattern to shrink,

wherein the solvent is a nonaqueous-type solvent which does not contain water and dissolves the resin and the crosslinking component, but cannot dissolve the resist material,

wherein the nonaqueous-type solvent contains an alcohol.

2. The resin composition according to claim 1 , wherein the alcohol is a monovalent alcohol having 1 to 8 carbon atoms.

3. The resin composition according to claim 1 , wherein the hydroxyl group is at least one hydroxyl group (—OH) selected from hydroxyl groups originating from an alcohol, a phenol, or a carboxylic acid.

4. The resin composition according to claim 3 , wherein the hydroxyl group originating from an alcohol is a hydroxyl group having a fluoroalkyl group on a carbon atom of α position.

5. The resin composition according to claim 3 , wherein the hydroxyl group originating from a phenol is a phenolic hydroxyl group having an amide bond in the molecule.

6. The resin composition according to claim 1 , wherein the resin containing a hydroxyl group is a resin obtainable by copolymerizing at least one compound, selected from hydroxyacrylanilide and hydroxymethacrylanilide.

7. The resin composition according to claim 1 , wherein the crosslinking component is at least one compound selected from compounds containing a group shown by the following formula (1) and compounds containing two or more cyclic ethers as a reactive group,

wherein R 1 and R 2 individually represent a hydrogen atom or a group shown by the following formula (2), provided that at least one of R 1 and R 2 is the group shown by the following formula (2),

wherein R 3 and R 4 individually represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxyalkyl group having 1 to 6 carbon atoms, or R 3 and R 4 bond together to form a ring having 2 to 10 carbon atoms, and R 5 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

8. The resin composition according to claim 7 , wherein the crosslinking component is a compound containing a group shown by the above formula (1).

9. A method for forming a fine pattern comprising a step of forming a resist pattern on a substrate, a step of forming a coating of the resin composition for forming fine patterns on the resist pattern, a step of treating the coated substrate with heat, and a step of removing the coating with an alkaline aqueous solution and washing the substrate with water, wherein the resin composition for forming fine patterns is the resin composition according to claim 1 .

10. A resin composition for forming fine patterns comprising a resin which is not soluble in water, but soluble in alcohol, containing a hydroxyl group, a crosslinking component, and a solvent, capable of miniaturizing a resist pattern formed by a resist material by applying the composition to the resist pattern causing the resist pattern to shrink,

wherein the solvent is an alcohol solvent containing water in an amount of 10 wt % or less for the total solvent, the alcohol solvent consists essentially of one alcohol selected from 1-hexanol, 1-butanol, 2-butanol, and 4-methyl-2-pentanol.

11. The resin composition according to claim 10 , wherein the hydroxyl group is at least one hydroxyl group (—OH) selected from hydroxyl groups originating from an alcohol, a phenol, or a carboxylic acid.

12. The resin composition according to claim 11 , wherein the hydroxyl group originating from an alcohol is a hydroxyl group having a fluoroalkyl group on a carbon atom of α position.

13. The resin composition according to claim 11 , wherein the hydroxyl group originating from a phenol is a phenolic hydroxyl group having an amide bond in the molecule.

14. The resin composition according to claim 10 , wherein the resin containing a hydroxyl group is a resin obtainable by copolymerizing at least one compound selected from hydroxyacrylanilide and hydroxymethacrylanilide.

15. The resin composition according to claim 10 , wherein the crosslinking component is at least one compound selected from compounds containing a group shown by the following formula (1) and compounds containing two or more cyclic ethers as a reactive group,

wherein R 1 and R 2 individually represent a hydrogen atom or a group shown by the following formula (2), provided that at least one of R 1 and R 2 is the group shown by the following formula (2),

wherein R 3 and R 4 individually represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxyalkyl group having 1 to 6 carbon atoms, or R 3 and R 4 bond together to form a ring having 2 to 10 carbon atoms, and R 5 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

16. The resin composition according to claim 15 , wherein the crosslinking component is a compound containing a group shown by the above formula (1).

17. A method for forming a fine pattern comprising a step of forming a resist pattern on a substrate, a step of forming a coating of the resin composition for forming fine patterns on the resist pattern, a step of treating the coated substrate with heat, and a step of removing the coating with an alkaline aqueous solution and washing the substrate with water, wherein the resin composition for forming fine patterns is the resin composition according to claim 10 .