Polyester films with low thermal expansion and methods for manufacturing the same

摘要

Disclosed is a method for manufacturing a polyester film with low thermal expansion. 95 wt % to 55 wt % of crystalline polyester and 5 wt % to 45 wt % of amorphous polyester are mixed. The blend is then melt extruded to form a sheet. The sheet is then biaxially stretched to obtain a film. The biaxially stretched film is then treated with a heat-setting procedure.

主权项

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.