METHOD OF FORMING A BALLOON
A balloon formed from a lamination. The lamination includes a first layer, a second layer, a graphic design and a third layer. The first layer including from about 10 to about 90 wt. % crystalline polyester and from about 10 to about 90 wt. % of a formability enhancer to assist in increasing the polymeric chain flexibility. The formability enhancer has a melting point less than about 230° C. The first layer has a MD and a TD Young's Modulus of at least 10% lower than a crystalline polyester film in the absence of the formability enhancer. The second layer is a metallic barrier layer. The graphic design is printed onto a surface of the metallic barrier layer. The third layer is a sealant layer. The first layer is located between the second and third layers. The balloon contains a gas lighter than air.
1 - 28 . (canceled)
29 . A method of forming a balloon from a lamination, the method comprising:
dry blending a mixture comprising crystalline polyester and a formability enhancer;
extruding the dry-blended mixture comprising the crystalline polyester and the formability enhancer to form a first film layer, the first film layer comprising from about 60 to about 90 wt. % of the crystalline polyester and from about 10 to about 40 wt. % of the formability enhancer, the crystalline polyester including homopolyesters or copolyesters of polyethylene terephthalate, the formability enhancer assisting in increasing the polymeric chain flexibility, the formability enhancer having a melting point less than about 230° C.;
biaxially stretching the first film layer to form a biaxially-oriented first film layer;
providing a second layer being a metallic barrier layer;
printing a graphic design onto a surface of the metallic barrier layer;
providing a third layer being a sealant layer;
locating the first film layer between the second and third layers; and
forming and inflating a balloon containing a gas lighter than air using the first, second and third layers,
wherein the first film layer has a MD stretching ratio from about 2 to about 6 and a TD stretching ratio of from about 2 to about 5,
wherein the first film layer has a MD and a TD Young's Modulus of at least 10% lower than the first film layer in the absence of the formability enhancer.
30 . The method of claim 29 , wherein the MD stretching ratio of the first film layer is from about 3 to about 4.5, and the TD stretching ratio of the first film layer is from about 3 to about 4.5.
31 . The method of claim 29 , wherein the formability enhancer is a homopolymer or copolymer comprising repeating units of trimethylene terephthalate.
32 . The method of claim 29 , wherein the formability enhancer is a homopolymer or copolymer comprising repeating units of butylene terephthalate.
33 . The method of claim 29 , wherein the formability enhancer is a copolyester elastomer.
34 . The method of claim 29 , wherein the first film layer has a MD and TD Young's Modulus of at least 20% lower than the first film layer in the absence of the formability enhancer.
35 . The method of claim 34 , wherein the first film layer has a MD and a TD Young's Modulus of at least 40% lower than the first film layer in the absence of the formability enhancer.
36 . The method of claim 29 , wherein the thickness of the lamination is from about 4 μm to about 12 μm after biaxial orientation.
37 . The method of claim 29 further including extruding a fourth layer comprising an amorphous copolyester, the fourth layer being located between the first film layer and the third layer.
38 . The method of claim 37 , further including a fifth layer comprising a polymeric gas-barrier layer, the fifth layer being located between the first film layer and the second layer.
39 . The method of claim 29 , wherein the metallic barrier layer includes titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, aluminum, gold, palladium or combinations thereof.
40 . The method of claim 29 , wherein the sealant layer is a linear low density polyethylene, a low density polyethylene, or the combination thereof.
41 . The method of claim 29 , wherein the oxygen transmission rate of the balloon is less than about 30 cc/m 2 /day.
42 . The method of claim 29 , wherein the first layer comprises from about 65 to about 90 wt. % crystalline polyester and from about 10 to about 35 wt. % of the formability enhancer.
43 . The method of claim 42 , wherein the first layer comprises from about 75 to about 90 wt. % crystalline polyester and from about 10 to about 25 wt. % of the formability enhancer.
44 . The method of claim 29 , wherein the first film layer has a MD and TD Young's Modulus of at least 20% lower than the first film layer in the absence of the formability enhancer.
45 . A method of forming a balloon from a lamination, the method comprising:
dry blending a mixture comprising crystalline polyester and a formability enhancer;
extruding the dry-blended mixture comprising the crystalline polyester and the formability enhancer to form a first film layer, the first film layer comprising from about 60 to about 90 wt. % of the crystalline polyester and from about 10 to about 40 wt. % of the formability enhancer, the crystalline polyester includes homopolyesters or copolyesters of polyethylene terephthalate, the formability enhancer assisting in increasing the polymeric chain flexibility, the formability enhancer having a melting point less than about 230° C.;
biaxially stretching the first film layer to form a biaxially-oriented first film layer;
providing a second layer being a metallic barrier layer;
printing a graphic design onto a surface of the metallic barrier layer;
providing a third layer being a sealant layer;
locating the first film layer between the second and third layers; and
forming and inflating a balloon containing a gas lighter than air using the first, second and third layers,
wherein the first film layer has a MD stretching ratio from about 2 to about 6 and a TD stretching ratio of from about 2 to about 5,
wherein the first film layer has a composite MD and TD Young's Modulus of less than about 500 kg/mm 2 .