abstract |
The present invention provides a polymer having a structure of formula (I)n n n [Formula I]n n n n n n n n N, R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , a, b and c are as defined above. The present invention also provides a negative action photoimaging composition comprising the polymer of formula (I) mentioned above, which is suitable for the manufacture of printed circuit boards. |