Negative type photosensitive composition curable at low temperature

1. A negative type photosensitive composition comprising:

(I) an alkali-soluble resin which is a polymer comprising a carboxyl-containing polymerization unit and an alkoxysilyl-containing polymerization unit and also which has a solid content acid value of 40 to 190 mg KOH/g, and has a weight average molecular weight of 1,000 to 40,000,

(II) a polysiloxane which is trialkoxysilane and/or a tetraalkoxysilane and in combination with a dialkoxysilane,

(III) a compound having two or more (meth)acryloyloxy groups,

(IV) a silicone oligomer represented by the following formula (A):

in which

R 1 is methyl, phenyl epoxy or (meth)acrylic groups and

R 2 is methyl or ethyl; and

n is an integer of 2 to 20;

(V) a polymerization initiator, and

(VI) a solvent.

2. The composition according to claim 1 , wherein said carboxyl-containing polymerization unit is derived from an unsaturated carboxylic acid, an unsaturated carboxylic anhydride, or a mixture thereof.

3. The composition according to claim 1 , wherein said alkoxysilyl-containing polymerization unit is derived from a monomer represented by the following formula (B):

X B —(CH) 2 —Si(OR B ) b (CH 3 ) 3-b

in which

X B is a vinyl, styryl or (meth)acryloyl group;

R B is methyl or ethyl group;

a is an integer of 0 to 3; and

b is an integer of 1 to 3.

4. The composition according to claim 1 , wherein said polysiloxane has a weight average molecular weight of 700 to 5000.

5. The composition according to claim 1 , which contains said silicone oligomer or said compound having two or more epoxy groups in an amount of 1 to 70 weight parts based on 100 weight parts in total of said alkali-soluble resin and said polysiloxane.

6. The composition according to claim 1 , which contains said compound having two or more (meth)acryloyloxy groups in an amount of 3 to 80 weight parts based on 100 weight parts in total of said alkali-soluble resin and said polysiloxane.

7. The composition according to claim 1 , wherein said polymerization initiator is a photo-radical generator.

8. A method for forming a cured film, comprising:

coating a substrate with the composition according to claim 1 , to form a coating film,

exposing the coating film to light, and

developing the exposed film.

9. The method for forming a cured film, according to claim 8 ; which further comprises the step of heating to cure the coating film at a temperature of 70 to 360° C. after the developing step.

10. The method according to claim 8 , wherein a developer of a concentration of 0.05 to 1.5 wt % TMAH aqueous solution, 0.1 to 2.5 wt % sodium carbonate aqueous solution, or 0.01 to 1.5 wt % potassium hydroxide aqueous solution is used in the developing the exposed film.

11. A cured film formed from the composition according to claim 1 .

12. A device comprising the cured film according to claim 11 .

13. The composition according to claim 1 , wherein said alkali-soluble resin has a weight average molecular weight of 2,000 to 30,000.

14. A negative type photosensitive composition comprising:

(I) an alkali-soluble resin which is a polymer comprising a carboxyl-containing polymerization unit and an alkoxysilyl-containing polymerization unit and also which has a solid content acid value of 40 to 190 mg KOH/g, and has a weight average molecular weight of 1,000 to 40,000,

(II) a polysiloxane,

(III) a compound having two or more (meth)acryloyloxy groups,

(IV) a silicone oligomer represented by the following formula (A):

in which

R 1 is straight, branched or cyclic alkyl group having 1 to 20 carbon atoms, epoxy, (meth)acrylic group, mercapto group, hydroxyl group, an alkoxy group acetyl group and isocyanurate groups,

R 2 is a group selected from the group consisting of a straight, branched or cyclic alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, epoxy group, (meth)acrylic group, mercapto group, carboxyl group, hydroxyl group, an alkoxy group, and isocyanurate group; provided that said alkyl or aryl group may be substituted with a group selected from the group consisting of epoxy group, (meth)acrylic group, mercapto group, carboxyl group, hydroxyl group, an alkoxy group, and isocyanurate group; and

n is an integer of 2 to 20;

(V) a polymerization initiator, and

(VI) a solvent.

15. The composition according to claim 14 , wherein said polysiloxane has a weight average molecular weight of 700 to 5000.

16. The composition according to claim 14 , which contains said silicone oligomer or said compound having two or more epoxy groups in an amount of 1 to 70 weight parts based on 100 weight parts in total of said alkali-soluble resin and said polysiloxane.

17. The composition according to claim 14 , which contains said compound having two or more (meth)acryloyloxy groups in an amount of 3 to 80 weight parts based on 100 weight parts in total of said alkali-soluble resin and said polysiloxane.

18. The composition according to claim 14 , wherein said polymerization initiator is a photo-radical generator.

19. A method for forming a cured film, comprising:

coating a substrate with the composition according to claim 14 , to form a coating film,

exposing the coating film to light, and

developing the exposed film.

20. The method for forming a cured film, according to claim 19 , which further comprises the step of heating to cure the coating film at a temperature of 70 to 360° C. after the developing step.

21. The method according to claim 19 , wherein a developer of a concentration of 0.05 to 1.5 wt % TMAH aqueous solution, 0.1 to 2.5 wt % sodium carbonate aqueous solution, or 0.01 to 1.5 wt % potassium hydroxide aqueous solution is used in the developing the exposed film.

22. A cured film formed from the composition according to claim 14 .

23. A device comprising the cured film according to claim 22 .

24. The composition according to claim 14 , wherein R 1 is methyl, ethyl, epoxy, (meth)acrylic, mercapto, hydroxyl, acetyl, or isocyanurate groups.

25. The composition according to claim 14 , wherein R 1 is methyl, phenyl epoxy or (meth)acrylic groups and R 2 is methyl or ethyl.

26. The composition according to claim 14 , wherein said alkali-soluble resin has a weight average molecular weight of 2,000 to 30,000.

27. The composition according to claim 14 , wherein said silicone oligomer has a weight average molecular weight of 10,000 or less.

28. The composition according to claim 14 , wherein the component (IV) further comprises a compound having two or more epoxy groups and selected from the group consisting of the formula (C) and formula (D)

wherein

each R3 is independently an alkyl group, an aryl group, carboxy group, a fluorinated alkyl group, a carboxyalkyl group, a glycidyloxyaryl group, a glycidyloxyarylalkyl group or a glycidyloxyarylalkylaryl group, provided that two R3s connecting to the same carbon atom may link to each other to form a cycloalkyl or condensed multicyclic hydrocarbon ring;

each R4 is independently a glycidyloxyarylalkyl group or an alkyl group; and

p is an integer of 0 to 4.

29. The composition according to claim 28 , wherein each R 3 is independently an alkyl group of 1 to 8 carbon atoms, an aryl group of 6 to 10 carbon atoms, carboxy group, a fluorinated alkyl group of 1 to 3 carbon atoms, a carboxyalkyl group of 2 to 4 carbon atoms, a glycidyloxyaryl group of 6 to 13 carbon atoms, a glycidyloxyarylalkyl group of 9 to 15 carbon atoms, or glycidyloxyarylalkylaryl group of 15 to 25 carbon atoms, or

in the case where R 3 s form a cycloalkyl ring, the ring contains 6 to 8 carbon atoms and if the ring is a condensed multicyclic hydrocarbon ring, the ring contains 10 to 15 carbon atoms;

each R 4 is independently a glycidyloxyarylalkyl group of 9 to 13 carbon atoms or an alkyl group of 1 to 8 carbon atoms and

p is an integer of 0 to 2.

30. A negative type photosensitive composition comprising:

(I) an alkali-soluble resin which is a polymer comprising a carboxyl-containing polymerization unit and an alkoxysilyl-containing polymerization unit and also which has a solid content acid value of 40 to 190 mg KOH/g, and has a weight average molecular weight of 1,000 to 40,000,

(II) a polysiloxane,

(III) a compound having two or more (meth)acryloyloxy groups,

(IV) a silicone oligomer represented by the following formula (A):

in which

R 1 is independently a group selected from the group consisting of a straight, branched or cyclic alkyl group having 1 to 20 carbon atoms, epoxy group, (meth)acrylic group, mercapto group, hydroxyl group, and isocyanurate group; provided that said aryl group may be substituted with a group selected from the group consisting of epoxy group, (meth)acrylic group, mercapto group, carboxyl group, hydroxyl group, and isocyanurate group or said alkyl group may be substituted with a group selected from the group consisting of epoxy group, (meth)acrylic group, mercapto group, carboxyl group, and isocyanurate group;

R 2 is a group selected from the group consisting of a straight, branched or cyclic alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, epoxy group, (meth)acrylic group, mercapto group, carboxyl group, hydroxyl group, an alkoxy group, and isocyanurate group; provided that said alkyl or aryl group may be substituted with a group selected from the group consisting of epoxy group, (meth)acrylic group, mercapto group, carboxyl group, hydroxyl group, an alkoxy group, and isocyanurate group; and

n is an integer of 2 to 20;

(V) a polymerization initiator, and

(VI) a solvent.

31. The composition according to claim 30 , wherein the component (IV) further comprises a compound having two or more epoxy groups and selected from the group consisting of the formula (C) and formula (D)

wherein

each R3 is independently an alkyl group, an aryl group, carboxy group, a fluorinated alkyl group, a carboxyalkyl group, a glycidyloxyaryl group, a glycidyloxyarylalkyl group or a glycidyloxyarylalkylaryl group, provided that two R3s connecting to the same carbon atom may link to each other to form a cycloalkyl or condensed multicyclic hydrocarbon ring;

each R4 is independently a glycidyloxyarylalkyl group or an alkyl group; and

p is an integer of 0 to 4.

32. The composition according to claim 31 , wherein each R 3 is independently an alkyl group of 1 to 8 carbon atoms, an aryl group of 6 to 10 carbon atoms, carboxy group, a fluorinated alkyl group of 1 to 3 carbon atoms, a carboxyalkyl group of 2 to 4 carbon atoms, a glycidyloxyaryl group of 6 to 13 carbon atoms, a glycidyloxyarylalkyl group of 9 to 15 carbon atoms, or glycidyloxyarylalkylaryl group of 15 to 25 carbon atoms, or

in the case where les form a cycloalkyl ring, the ring contains 6 to 8 carbon atoms and if the ring is a condensed multicyclic hydrocarbon ring, the ring contains 10 to 15 carbon atoms;

each R 4 is independently a glycidyloxyarylalkyl group of 9 to 13 carbon atoms or an alkyl group of 1 to 8 carbon atoms and

p is an integer of 0 to 2.