POLYESTER FILM FOR METAL SHEET LAMINATION
PROBLEM TO BE SOLVED: To obtain a polyester film for metal sheet lamination which is excellent in laminatability, wear resistance during deep drawing/ironing, and adhesion to a steel sheet after retorting by incorporating a specified amt. of aggregate silica having a specified average particle size...
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Zusammenfassung: | PROBLEM TO BE SOLVED: To obtain a polyester film for metal sheet lamination which is excellent in laminatability, wear resistance during deep drawing/ironing, and adhesion to a steel sheet after retorting by incorporating a specified amt. of aggregate silica having a specified average particle size into the same. SOLUTION: This polyester film contains 0.05-1 wt.% aggregate silica having an average particle size of 0.01-2.0 μm, a micropore vol. of 2.0-6.0 cm3/g, and pref. a specific surface area of 50-300 m2/g. In order to improve the adhesion to a steel sheet and the adhesion to a steel sheet after retorting, the polyester film pref. has a content of terminal carboxy groups of 30-50 equivalents/ton. Aggregate silica can be incorporated into a polyester, e.g. by the direct addition to a polymn. system or by mixing particles into a molten polyester. |
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