Patent ID: 8772419
Filing Date: 2014-07-08
Classification: B29C,B29K,C08G,C08J,C08L

Abstract:
1. A polyester film with low thermal expansion, consisting of: 95 wt % to 55 wt % of poly(ethylene-2,6-naphthalate) copolymerized of dimethyl-2,6-naphthalene dicaboxylate and ethylene glycol as a crystalline polyester; and 5 wt % to 45 wt % of cyclohexanedimethanol-modified poly(ethylene-terephthalate) copolymerized of terephthalic acid, ethylene glycol, and cyclohexanedimethanol, wherein the ethylene glycol and the cyclohexanedimethanol have a molar ratio of 50:50 to 80:20, and the cyclohexanedimethanol comprises 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, or combinations thereof as an amorphous polyester, wherein the poly(ethylene-2,6-naphthalate) and the cyclohexanedimethanol-modified poly(ethylene-terephthalate) are mixed with each other.