TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The acidic material and the absorbent additive are crosslinked by the binder through covalent bonding, columbic interaction, hydrophobic interaction, or hard and soft block phase separation. The coupling of the acidic material and the absorbent additive is performed by a process of radiation, heat and/or moisture. The binder: comprises aromatic or aliphatic urethane acrylates, epoxy acrylates, acrylic acrylates, polyether acrylates, polyesters acrylates, oxyethylated phenol acrylate, phenoxyethyl acrylate, polyethylene glycol diacrylate, polyether triacrylate and/or polyether tetraacrylate; and is present at 5-10 wt.% of the total weight of the absorbent additive and the binder. The acidic material: comprises an organic acid and/or an organic acid anhydride, preferably citric acid, tartaric acid, stearic acid, salicylic acid, succinic acid, maleic acid, maleic anhydride, phthalic acid, phthalic anhydride, naphthalic acid, naphthalic anhydride and/or their derivatives, or poly(styrene-co-maleic anhydride), poly(maleic anhydride-alt-1-octadecene), poly(propylene-graft-maleic anhydride), poly(styrene-co-maleic anhydride), poly(styrene-alt-maleic anhydride), poly(ethylene-co-ethyl acrylate-co-maleic anhydride), polyethylene-graft-maleic anhydride, polypropylene-graft-maleic anhydride, polyisoprene-graft-maleic anhydride, poly(ethylene alt-maleic anhydride), poly(isobutylene-alt maleic anhydride), poly(methyl vinyl ether-alt-maleic anhydride) and/or poly (maleic anhydride-alt-1-octadecene); and is present at 15-25 wt.% of the total weight of the absorbent additive and the binder. The absorbent additive: comprises cotton, starch, cellulose, polysaccharide, polyacrylate, poly(diacetone-acrylamide), polyvinylalcohol, poly(ethylene glycol)diacrylate, silica, poly-2-hydroxyethyl methacrylate, agarose, 2-hydroxyethyl methacrylate and/or trimethylpropane ethoxylate triacrylate; and is present at 90-95 wt.% of the total weight of the absorbent additive and the binder. EXAMPLE - Polyethylene glycol diacrylate (9.025 g), silica (0.6 g) and BYK-164 (RTM: Dispersing agent) (0.006 g) were uniformly dispersed in ethyl acetate. Then trimethylpropane ethoxylate triacrylate (0.475 g), poly(styrene-co-maleic anhydride) (1.9 g) and an initiator (0.19 g) were added to the dispersion and mixed for carrying out polymerization and cross-linking reaction. The mixed solution was coated on an aluminum pouch with a corona treatment. The ethyl acetate was removed by baking and the film was cured by UV to produce a protective coating material.