| 摘要 |
PROBLEM TO BE SOLVED: To obtain a coating agent which is environmentally friendly and has O2 barrier properties equivalent to those of a PVDC latex by usingα-starch having a specified number average mol.wt. SOLUTION: Alpha-starch obtd. by dispersing, boiling, and hydrolyzingβ-starch, typified by corn starch, in an acid to adjust the number average mol.wt. to 5,000-100,000 is used, The concn. of starch of anα-starch soln. used as the gas barrier coating agent is pref. 0.1-40 wt.%. If necessary, a crosslinker is also incorporated. A crosslinker which crosslinks to OH groups of starch is pref., examples being a dimethylol resin, a methylated trimethylolmelamine resin, a dimethyldihydroxyethyleneurea resin, ethylene glycol diglycidyl ether, and glycerin diglycidyl ether. This coating agent has O2-barrier properties equal to or higher than those of a vinylidene chloride copolymer latex.
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