Photosensitive polyimides

1. A photosensitive polyimide of formula (I):

wherein:

A represents a tetravalent organic group with at least one modifying group R 1 ;

B and D are the same or different and each represent a divalent organic group;

C represents a tetravalent organic group without any modifying group R 1 ;

m represents an integer of more than 0; and

n represents 0 or an integer more than 0,

wherein the modifying group R 1 is selected from the group consisting of:

wherein R 2 represents a vinyl-group containing unsaturated radical.

2. The photosensitive polyimide of claim 1 , wherein the vinyl-group containing unsaturated radical is selected from the group consisting of:

wherein:

R 3 represents H or methyl, and o and p each represent an integer of 0 to 6.

3. The photosensitive polyimide of claim 1 , wherein A is selected from the group consisting of:

wherein:

R 1 is as defined in claim 1 ;

R 4 is —CH 2 —, —O—, —S—, —CO—, —SO 2 —, C(CH 3 ) 2 , or C(CF 3 )—;

R 5 is —H or —CH 3 ; and

X is —O—, —NH—, or —S—.

4. The photosensitive polyimide of claim 3 , wherein A is selected from the group consisting of:

wherein R 1 is as defined in claim 1 .

5. The photosensitive polyimide of claim 1 , wherein C is selected from the group consisting of:

6. The photosensitive polyimide of claim 5 , wherein C is selected from the group consisting of:

7. The photosensitive polyimide of claim 1 , wherein B and D each represent a divalent organic group selected from the group consisting of:

wherein:

R 7 is H, methyl, or ethyl;

R 8 is H, C 1 -C 4 alkyl, C 1 -C 4 perfluoroalkyl, methoxy, ethoxy, halogen, OH, COOH, NH 2 or SH;

a is integer of more than 0;

b is integer of more than 0;

c is an integer of 0 to 4;

d is an integer of 0 to 4; and

R 9 is a covalent bond or a radical selected from:

wherein w and x each represent an integer of more than 0,

and R 11 is —S(O) 2 —, —C(O)—, a covalent bond, or a substituted or unsubstituted C 1 to C 18 organic group.

8. The photosensitive polyimide of claim 7 , wherein B and D each represent a divalent organic group selected from the group consisting of:

wherein y represents an integer of 1 to 12.

9. A photosensitive composition comprising the photosensitive polyimide as claimed in claim 1 and a photoinitiator.

10. The photosensitive composition of claim 9 , further comprising a reactive monomer or oligomer.

11. The photosensitive composition of claim 9 for use in a liquid photo resist or dry film resist.