IP Library › Granted Patent US 6,913,812
Granted Patent B2
US 6,913,812 · App. 10/851,063 · Granted Jul 5, 2005

Releasing laminated film

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Quick Facts
Patent No.
US 6,913,812
App. No.
10/851,063
Granted
Jul 5, 2005
Kind
B2
Abstract

A releasing laminated film is provided, which film comprises a supporting film having a tensile modulus of elasticity in a traverse direction measured according to ASTM D882 of 980 to 6,860 N/mm 2 and at least one film comprising a fluororesin laminated on at least one side of the supporting film. The releasing film is suitably used for producing a multilayered printed circuit board and a coating film.

Claims (4)

1. A laminated carrier film comprising a drawn polyester film having a thickness of 5 to 300 μm and a film comprising a fluororesin laminated directly onto at least one side of the drawn polyester film, the carrier film having a difference between a maximum thickness and a minimum thickness (R) of 5 μm or smaller, wherein R is measured along a 10 cm-long line starting at an arbitrary point on a surface of the laminated film with a continuous-mode thickness meter provided with a tip having a diameter of 5 mm.

2. The carrier film according to claim 1 , where R is 3 μm or smaller.

3. The carrier film according to claim 1 , wherein the drawn polyester film is a polyethylene terephthalate film having a thickness to 5 to 100 μm.

4. The carrier film according to claim 1 , wherein the film comprising a fluororesin is a tetrafluoroethylene-ethylene copolymer film having a thickness of 2 to 10 μm.