Continuous wet grinding process

A composition comprising repeat units derived from a carbonyl compound or oligomer thereof and a glycol as well as inorganic filler, wherein

• said carbonyl compound is HO—R—COOH or R′OOCACOOR′;
• A is an alkylene group, arylene group, alkenylene group, or combinations of two or more thereof having 2 to 30 carbon atoms per group;
• each R or R′ is independently selected from (i) hydrogen, (ii) a hydrocarboxyl radical having a carboxylic acid group at the terminus, or (iii) a hydrocarbyl radical in which each radical has 1 to 30 carbon atoms per radical selected from an alkyl, alkenyl, aryl, alkaryl, aralkyl radical, or combinations of two or more thereof;
• said oligomer has 2 to 100 repeat units;
• said inorganic filter is produced in a continuous wet grinding process with one or more continuous wet grinding line comprising (1) three or more sealed wet grinders connected in cascade, (2) no unsealed container connected between said grinders, (3) a positive displacement pump connected before the first sealed wet grinder in said cascade to provide the required pressure by the process flow and to regulate flow rate, (4) optionally one or more non-volume delivery pump connected before one or more of said grinders except the first grinder in said cascade to provide necessary pressure without changing flow rate;
• said inorganic filler is 0.01% to 10% of said composition.