Patent ID: 6839171
Filing Date: 2005-01-04
Classification: B32B,C09J,C09K,G02B,Y10T

Abstract:
1. A biaxially oriented polyester film which comprises (A) a coextruded polyester film which comprises at least two layers, has a haze value of 4% or less and an orientation angle of 10° or less, and contains 5 or less impurities having a long diameter of 90 μm or more per 0.3 m 2 of the film plane and contains only 30 or less impurities having a long diameter of 20 to 50 μm per 0.3 m 2 of the film plane, and (B) a silicone adhesive layer formed on one side of the coextruded polyester film (A) and (C) which is used to release a polarizing plate, wherein the birefringence factor of the coextruded polyester film (A) which comprises at least two layers is 0.12 or less.