Ethoxy benzoic acid increases the strength and solubility of the cement:
Modifications have been made to improve the strength and abrasion resistance of  ZOE cement for long-term luting. One system substitutes orthoethoxybenzoic acid (EBA) for part of the eugenol liquid, and includes alumina in the powder. Another system (ZOE plus polymer) consists of eugenol liquid and a special powder containing of 20%  to 40% by weight of fine polymer particles and zinc oxide particles that have been surface treated with carboxylic acid.
Phillips 12 ed pg 331
Zinc oxide eugenol
Polycarboxylate cement
Zinc phosphate cement
Silicate cement