Sealable peelable polyester films
AssigneeMylar Specialty Films U.S. Limited Partnership
InventorsShengsheng Liu, Nebojsa Pantelic
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Abstract
A polymeric film includes a polyester substrate layer and a heat-sealable polymeric layer disposed on one surface of the polyester substrate layer. In some cases, the heat-sealable polymeric layer includes a copolyester A having a glass transition temperature Tg(A) in an amount WA and a copolyester B having a glass transition temperature Tg(B) in an amount WB. In certain cases, (i) WA>WB; (ii) WA is at least 50 wt % by total weight of the heat-sealable polymeric layer; (iii) WB is at least 10 wt % by total weight of the heat-sealable polymeric layer; (iv) Tg(A)>Tg(B); (v) Tg(B) is in the range of −35° C. to −10° C.; and (vi) Tg(A) is in the range of −15° C. to 5° C.
Claims35
A polymeric film comprising a polyester substrate layer and a heat-sealable polymeric layer disposed on one surface of said polyester substrate layer, wherein the heat-sealable polymeric layer comprises copolyester A having a glass transition temperature Tg(A) in an amount WA and copolyester B having a glass transition temperature Tg(B) in an amount WB, wherein:
- (i) WA>WB;
- (ii) WA is at least 50 wt % by total weight of the heat-sealable polymeric layer;
- (iii) WB is at least 10 wt % by total weight of the heat-sealable polymeric layer;
- (iv) Tg(A)>Tg(B);
- (v) Tg(B) is in the range of −35° C. to −10° C.;
- and
- (vi) Tg(A) is in the range of −15° C. to 5° C.
Dependencies are inferred from the claim text.