Biaxially oriented polyester film for a membrane switch
First Claim
1. A biaxially oriented polyester film for a membrane switch,(A) which comprises a polyester containing at least 80 mol % of ethylene-2,6-naphthalene dicarboxylate recurring units, and(B) which has an endothermic peak with an endothermic energy of at least 0.4 mJ/mg at a temperature of 110 to 160°
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1 Assignment
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Accused Products
Abstract
A biaxially oriented polyester film for a membrane switch, which is made from a polyester containing at least 80 mol % of ethylene-2,6-naphthalene dicarboxylate recurring units and which has an endothermic peak with an endothermic energy of at least 0.4 mJ/mg at a temperature of 110 to 160° C.
This film is produced by subjecting a biaxially oriented polyester film produced from the above polyester in accordance with a method known per se to the following steps in the order named:
(1) the step of heating the film under no strain at a temperature of 150 to 180° C. for 1 to 5 hours; and
(2) the step of heating the film in an unrolled or rolled state at a temperature of 80 to 122° C. for 5 to 200 hours.
27 Citations
22 Claims
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1. A biaxially oriented polyester film for a membrane switch,
(A) which comprises a polyester containing at least 80 mol % of ethylene-2,6-naphthalene dicarboxylate recurring units, and (B) which has an endothermic peak with an endothermic energy of at least 0.4 mJ/mg at a temperature of 110 to 160°
Specification