Itaconic acid , succinic acid scientific name is methylene , methylene succinic acid is an unsaturated dicarboxylic acids . Active chemical properties , the polymerization can be carried out between themselves , but also can be polymerized with other units such as acrylonitrile , soluble in water, ethanol and other solvents ; conduct various kinds of addition reactions , esterification and polymerization reaction is an important chemical production raw material.