Positive-type photosensitive resin composition, method for producing resist pattern, and electronic component

1. A positive tone photosensitive composition comprising:

(A) an alkali-soluble resin having a phenolic hydroxyl group;

(B) a phenol resin modified by a compound having an unsaturated hydrocarbon group containing 4 to 100 carbon atoms;

(C) a compound that generates an acid by the action of light;

(D) a thermal cross-linker; and

(E) a solvent.

2. The positive tone photosensitive composition according to claim 1 , wherein the ingredient (A) is a phenol resin.

3. The positive tone photosensitive composition according to claim 1 , wherein the ingredient (A) is a vinyl polymer containing a monomer unit having a phenolic hydroxyl group.

4. The positive tone photosensitive composition according to claim 1 , wherein the ingredient (B) is further modified by the reaction of the phenolic hydroxyl group with a polybasic acid anhydride.

5. The positive tone photosensitive composition according to claim 1 , wherein the mass ratio between the ingredient (A) and the ingredient (B) is from 5:95 to 95:5, based on the total amount of the ingredients (A) and (B) that is defined as 100.

6. The positive tone photosensitive composition according to claim 1 , wherein the ingredient (C) is an o-quinone diazide compound.

7. The positive tone photosensitive composition according to claim 1 , comprising 3 to 100 parts by mass of the ingredient (C), with respect to the total amount of the ingredients (A) and (B) that is defined as 100 parts by mass.

8. The positive tone photosensitive composition according to claim 1 , further comprising an elastomer (F).

9. A method for producing a resist pattern, the method comprising the steps of:

exposing a photosensitive resin film formed by drying the positive tone photosensitive composition according to claim 1 to light;

developing the photosensitive resin film obtained after completion of the exposure in an alkaline aqueous solution to form a resist pattern; and

heating the resist pattern.

10. The method for producing a resist pattern according to claim 9 , wherein the resist pattern is heated at 200° C. or less.

11. An electronic component having a resist pattern formed by the method for producing a resist pattern according to claim 9 as an interlayer dielectric layer or a surface-protective layer.

12. An electronic component having a resist pattern formed by the method for producing a resist pattern according to claim 9 as a cover coating layer.

13. An electronic component having a resist pattern formed by the method for producing a resist pattern according to claim 9 as a core used for a redistribution layer.

14. An electronic component having a resist pattern formed by the method for producing a resist pattern according to claim 9 as a collar for holding a conductive ball that is an external connection terminal.

15. An electronic component having a resist pattern formed by the method for producing a resist pattern according to claim 9 as an underfill.