Examples of suitable dicarboxylic acid components that can be employed by the instant invention are represented by the following formulas: ##STR6## wherein Z represents hydrogen, halogen, e.g. Cl or Br, an alkyl or alkoxy group having 1 to 4 carbon atoms, or phenyl, and m is 0 to 2. ##STR7## Particularly preferred dicarboxylic acid components are: ##STR8## Examples of hydroxycarboxylic acid compon