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US 8,772,419 B2Granted
Polyester films with low thermal expansion and methods for manufacturing the same
AssigneeIndustrial Technology Research Institute
InventorsLi-Cheng Jheng, Jrjeng Ruan, Ming-Tsong Leu, Kuo-Chen Shih, Jyh-Horng Wu, Cheng-Hsing Fan
Life of this patent
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Abstract
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.
Claims6
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.
1 more element
A method of manufacturing a polyester film with low thermal expansion, comprising:
- drying and then mixing 95 wt % to 55 wt % of crystalline polyester and 5 wt % to 45 wt % of amorphous polyester to form a blend;
- melt extruding the blend to form a sheet;
- biaxial stretching the sheet to form a film;
- and
- heat-setting the film;
- wherein the crystalline polyester is poly(ethylene-2,6-naphthalate) copolymerized of dimethyl-2,6-naphthalene dicaboxylate and ethylene glycol;
- and
- wherein the amorphous polyester is 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.
5 more elements
Dependencies are inferred from the claim text.