Positive photosensitive insulating resin composition, cured product thereof, and electronic component

1. A positive photosensitive insulating resin composition comprising:

(A) an alkali soluble resin,

(B) a compound having a quinonediazide group,

(C) an epoxy resin having a softening point of not lower than 30°C.,

(D) a cross-linking agent, and

(a) an optional phenolic compound, wherein the amount of said epoxy resin (C) is 1 to 100 parts by weight and the amount of said cross-linking agent (D) is 2 to 50 parts by weight based on 100 parts by weigh of the total amount of said alkali soluble resin (A) and said phenolic compound (a).

2. The positive photosensitive insulating resin composition according to claim 1 , wherein the alkali soluble resin (A) is a resin (A1) having a phenolic hydroxyl group.

3. The positive photosensitive insulating resin composition according to claim 1 or 2 , which further comprises crosslinked fine particles (E).

4. The positive photosensitive insulating resin composition according to claim 3 , wherein the crosslinked fine particles (E) have a number-average particle diameter of 30 to 500 nm and at least one of the glass transition temperatures of constituent polymers of the crosslinked fine particles (E) is not higher than 0° C.

5. The positive photosensitive insulating resin composition according to claim 1 , wherein the amount of the compound (B) having the quinonediazide group is 5 to 50 parts by weight and the amount of the epoxy resin (C) having a softening point of not lower than 30° C. is 1 to 100 parts by weight based on 100 parts by weight of the total amount of the alkali soluble resin (A) and an optional phenolic compound (a).

6. A cured product obtained by curing the positive photosensitive insulating resin composition of claim 1 .

7. A cured product obtained by curing the positive photosensitive insulating resin composition of claim 2 .

8. A cured product obtained by curing the positive photosensitive insulating resin composition of claim 3 .

9. An electronic component comprising the cured product of claim 6 , said electronic component being a printed circuit board, a semiconductor device or a semiconductor package.

10. An electronic component comprising the cured product of claim 7 , said electronic component being a printed circuit board, a semiconductor device or a semiconductor package.

11. An electronic component comprising the cured product of claim 8 , said electronic component being a printed circuit board, a semiconductor device or a semiconductor package.

12. The electronic component according to claim 9 , wherein the cured product is an interlayer insulation film, a passivation film, overcoat film, buffer film or a planarized film.

13. The electronic component according to claim 10 , wherein the cured product is an interlayer insulation film, a passivation film, overcoat film, buffer film or a planarized film.

14. The electronic component according to claim 11 , wherein the cured product is an interlayer insulation film, a passivation film, overcoat film, buffer film or a planarized film.

15. The positive photosensitive insulating resin composition according to claim 1 , which further comprises an adhesion auxiliary (F).

16. A process for forming a cured product, comprising:

(i) applying the positive photosensitive insulating resin composition of claim 1 on a substrate to form a coating film,

(ii) exposing the coating film to light through a desired pattern mask,

(iii) dissolving and removing the exposed portions by developing with an alkaline developer to obtain the desired pattern, and

(iv) heating the obtained desired pattern.