Biaxially stretched Polyamide film aplicated to long life balloon

摘要

PURPOSE: Provided is a polyamide laminate film for a long-life balloon, which has improved gas-barrier property even under high humidity condition and adhesive strength to an aluminum-deposited layer, and thus keeps the balloon floating in the sky for a long time, while maintaining the shape of balloon regardless of an environmental change. CONSTITUTION: The polyamide laminate film for a long-life balloon comprises a modified polyvinyl alcohol resin-containing coating layer(21) having a thickness of 0.1-1.0 micrometer on a polyamide film(20). Further, the polyamide laminate film optionally comprises an aluminum-deposited layer(23) on the coating layer(21). The modified polyvinyl alcohol resin is a polyvinyl alcohol as a main chain with a hydroxyalkyl group having 2-10 of carbon atoms as a side chain and has the saponification degree to 97% or more.