Lighter than air balloon made from a biaxially oriented polyester film

A balloon formed from a lamination, the lamination comprising;

• a polyester film with a total thickness of 4 μm to 12 μm comprising a biaxially oriented polyester core layer and at least one amorphous copolyester skin layer;
• a sealant layer adjacent to the amorphous copolyester skin layer;
• a first gas barrier layer on an opposite side of the polyester film from the sealant layer;
• and
• a second gas barrier layer on the first gas barrier layer;
• wherein an oxygen transmission rate of the balloon is less than 0.02 cc/100 sqin/day, a sealing strength of the balloon is more than 3.5 kg/in, and a floating time of the balloon is more than 40 days.

A balloon formed from a lamination, the lamination comprising;

• a polyester film with a total thickness of 4 μm to 12 μm comprising a biaxially oriented polyester core layer and at least one amorphous copolyester skin layer;
• a sealant layer adjacent to the amorphous copolyester skin layer;
• and
• a ceramic gas barrier layer on an opposite side of the polyester film from the sealant layer,
• wherein an oxygen transmission rate of the balloon is less than 0.1 cc/100 sqin/day, a sealing strength of the balloon is more than 3.5 kg/in, a total light transmittance is more than 30% and a floating time of the balloon is more than 20 days.