Patent ID: 7041748

Claim:
A composition of matter comprising a cured and functionalized polymer having one or more acid-sensitive imageable groups, wherein said polymer has a dielectric constant of less than 3.9 wherein said functionalized polymer is a caged silsesquioxane polymer including combinations thereof having the formula: wherein each occurrence of R 1 is independently one or more acidic functional groups for base solubility; each occurrence of R 2 independently comprises at least one acid-sensitive imageable functional group for crosslinkin; R 1 is not equal to R 2 ; m and n represent the number of repeating units; m is an integer; and n is zero or an integer greater than zero, wherein said acid-sensitive imageable functional group for crosslinking is selected from a linear or branched alkyl that is substituted with at least one of —OH, epoxide, or —F; a cycloalkyl which is substituted with at least one of —OH, epoxide, or —F; a cyclo aromatic that is substituted with at least one of —OH, epoxide, or —F; or an arene that is substituted with at least one of —OH, epoxide, or —F.