Patent Number: 6,309,730

Title: Releasing film

Abstract: A releasing film comprising: a base film produced from a polyethylene naphthalate, and a releasing layer formed on one or both sides of the base film, wherein the polyethylene naphthalate contains naphthalenedicarboxylic acid as the main acid component and ethylene glycol as the main glycol component and further contains a manganese compound, a phosphorus compound and an antimony compound in Mn, P and Sb amounts satisfying all of the following formulas (1) to (3): (wherein Mn is moles of manganese element per 10.sup.6 g of acid component; P is moles of phosphorus element per 10.sup.6 g of acid component; and Sb is moles of antimony element per 10.sup.6 g of acid component), and the base film has a surface center line average roughness (Ra) of 2 to 50 nm.

Inventors: Sumi; Hiroyuki (Sagamihara, JP)

Assignee: Teijin Limited

International Classification: C09J 7/02 (20060101); B32B 027/08 (); B32B 027/28 (); B32B 027/30 (); B32B 027/36 (); B32B 027/42 ()

Expiration Date: 10/30/2018