Plastic film having a high voltage breakdown
AssigneeDuPont Teijin Films U.S. Limited Partnership
InventorsAlexis Grosrenaud, Luclen Schosseler
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Abstract
A stretched film comprising a dispersion of at least one polyester and/or polycarbonate in a matrix of at least one polyester and/or polycarbonate different from the first polyester and/or polycarbonate, the percentage by weight of the dispersed polyester and/or polycarbonate in the dispersion being less than 50% and the dispersed polyester and/or polycarbonate being in the form of platelets. The stretched film can be used as a dielectric in a capacitor.
Claims21
A biaxially stretched capacitor dielectric film having a thickness in the range of 0.3 to 25 μm comprising a dispersion of polycarbonate (PC) in a matrix of polyethylene naphthalate (PEN), the percentage by weight of the polycarbonate being less than 50% and the dispersed polycarbonate being in the form of platelets.
A biaxially stretched capacitor dielectric film having a thickness in the range of 0.3 to 25 um comprising:
- a dispersion consisting of at least two polymers selected from the group consisting of polyesters and polycarbonates, the dispersion forming platelets each of which being formed by the at least two polymers in
- a matrix consisting of a polyester selected from the group consisting of polyethylene terephthalate (PET) and polyethylene naphthalate (PEN);
- the percentage by weight of the dispersed polyester(s) and/or polycarbonate(s) in the dispersion being less than 50%;
- wherein the glass transition temperature of each of the polymers in the dispersion is in the range of Tgm+10° C. to Tgm+40° C., wherein Tgm is the glass transition temperature of the polyester of the matrix.
Dependencies are inferred from the claim text.