| abstract |
Disclosed is an adhesive for food packaging films, comprising a urethane resin obtainable by mixing: (A) a polyesterpolyurethane polyol; (B) a polyester polyol; and (C) an isocyanate component, wherein the polyesterpolyurethane polyol (A) is obtainable by chain extension of (a1) a polyester polyol with (a2) an isocyanate compound, and the equivalent ratio (NCO/OH) of the isocyanate group of the isocyanate compound (a2) to the hydroxyl group of the polyester polyol (a1) is 0.6 to 0.85, and wherein the polyester polyol (B) has a glass transition temperature of −20 to 10° C. n When a food packaging film is produced by laminating a plastic film, the adhesive for food packaging films is easy to apply and is excellent in initial adhesion to the film. Moreover, even after contents is enclosed in a food packaging bag prepared from the food packaging film and sterilized, the adhesive has strong peel strength. Even though the food packaging bag enclosing the food is stored over a long period of time at high temperature, the adhesive can maintain appearance of the food packaging film of the food packaging bag even when after putting contents into the food packaging bag. |