Claims
- 1. A method for thermally laminating a substrate with a polyester film, said method comprising contacting said substrate with said polyester film under heat, wherein said film has a melting point of 150-250.degree. C., contains 0.01-1% by weight of diethylene glycol component and not more than 0.8% by weight of cyclic trimers and has an intrinsic viscosity (.eta.) of not less than 0.7.
- 2. The method of claim 1, wherein said film has an intrinsic viscosity (.eta.) of not less than 0.8.
- 3. The method as claimed in claim 1 or 2, wherein said film contains 1-500 ppm of germanium.
- 4. The method as claimed in claim 1 or 2, wherein said film has terminal carboxyl groups in an amount of not more than 45 equivalents/ton.
- 5. The method as claimed in claim 1 or 2, wherein said film is a multi-layer film comprising a layer (I) containing not less than 70% by weight polyester A having a melting point of 150-230.degree. C. and a layer (II) containing not less than 70% weight polyester B having a melting point of 220-250.degree. C., said layers (I) and (II) being laminated.
- 6. The method to claim 5, wherein said polyester A has an intrinsic viscosity (.eta.) of not less than 0.7.
- 7. The method as claimed in claim 1 or 2, wherein said film has a coefficient of planar orientation fn of 0-0.12, wherein fn=(Nx+Ny)/2-Nz and Nx, Ny, and Nz are refractive indices in longitudinal, transverse, and thickness directions, respectively.
- 8. The method as claimed in claim 1 or 2, wherein at least one surface of said film has an average roughness Ra of 0.001-1 .mu.m, and a ratio RT/Ra of maximum surface height RT to the average roughness Ra of 3-60.
- 9. The method as claimed in claim 1 or 2, wherein at least one surface of said film has a surface wetting tension of not less than 45 dynes/cm.
- 10. The method as claimed in claim 1 or 2, wherein said film has at least two melting point peaks within a range between 150.degree. C. and 230.degree. C.
- 11. The method as claimed in claim 1 or 2, wherein said film contains 0.001-1% by weight of an antioxidant.
- 12. The method as claimed in claim 1 or 2, wherein said film is laminated on a substrate selected from the group consisting of steel plates, aluminum plates and surface-treated plates thereof.
Priority Claims (3)
Number |
Date |
Country |
Kind |
4-325451 |
Apr 1992 |
JPX |
|
5-055907 |
Mar 1993 |
JPX |
|
5-205270 |
Aug 1993 |
JPX |
|
Parent Case Info
This application is a 371 of PCT/JP93/01765 filed Dec. 3, 1993, which is a continuation of application Ser. No. 08/284,475, filed Aug. 4, 1994, now abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (4)
Number |
Date |
Country |
53-73288 |
Jun 1978 |
JPX |
1-192546 |
Aug 1989 |
JPX |
4-261826 |
Sep 1992 |
JPX |
WO-A-93 22367 |
Nov 1993 |
WOX |
Non-Patent Literature Citations (2)
Entry |
Kazuo Yugi et al., eds., Saturated Polyester Resins Handbook, pp. 153-159 and 586-595, Nikkan Kogyo Shinbun (1989). |
Derwent publications Ltd., London, GB; Section Ch, Week 8536, Class A23, AN 85-219511, XP002018107. |
Continuations (1)
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Number |
Date |
Country |
Parent |
284475 |
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