Aqueous dispersion, coating liquid containing this aqueous dispersion, method for producing polylactic acid film using this coating liquid, and sheet material

An aqueous dispersion comprising a biodegradable resin and a wax as dispersoids that are dispersed in a water-based dispersion medium, the aqueous dispersion being used for a heat sealant,

• wherein the biodegradable resin comprises polylactic acid,
• the wax comprises carnauba wax, and
• 1 to 14% by mass of the carnauba wax is blended relative to a mass of the polylactic acid, heat sealability at 120° C. and blocking resistance at 45° C. are imparted as a heat sealant, and
• the blocking resistance is referred to as blocking resistance between heat seal layers of a paper substrate and blocking resistance between the heat seal layer of the paper substrate and an uncoated surface on a back surface of the paper substrate.

An aqueous dispersion comprising a biodegradable resin, a plasticizer, and a wax as dispersoids that are dispersed in a water-based dispersion medium, the aqueous dispersion being used for a heat sealant,

• wherein the biodegradable resin comprises polylactic acid,
• the plasticizer is contained in an amount of 1 to 15% by mass relative to a mass of the polylactic acid,
• the wax comprises carnauba wax, and
• 1 to 14% by mass of the carnauba wax is blended relative to a total mass of the polylactic acid and the plasticizer, heat sealability at 120° C. and blocking resistance at 40° C. are imparted as a heat sealant, and
• the blocking resistance is referred to as blocking resistance between a heat seal layer of a paper substrate and an uncoated surface on a back surface of the paper substrate.