Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1997-03-05
1999-09-28
Chen, Vivian
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
428213, 428215, 428327, 428328, 428329, 428339, 428480, 428694ST, 428910, B32B 2706, B32B 2718, B32B 2736
Patent
active
059585684
ABSTRACT:
A biaxially oriented polyester film for a magnetic recording medium, which is formed from a polyester composition comprising at least one member of fine particulate agglomerates selected from the group consisting of alumina fine particulate agglomerates and fine particulate agglomerates of a composite oxide comprising alumina and other metal oxide(s) in a proportion of 0.05 to 1% by weight of the polyester, the fine particulate agglomerates having an average particle diameter of 0.005 to 0.5 .mu.m and having been surface-treated with an alkali metal salt of a polyvalent carboxylic acid; and other inert fine particles different from the above fine particulate agglomerates and having an average particle diameter of 0.2 to 2.0 .mu.m in a proportion of 0.05 to 5% by weight of the polyester; and a biaxially oriented laminate polyester film for a magnetic recording medium comprising a polyester film layer of the above polyester composition as at least one surface layer.
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Mizutani Kei
Watanabe Hideaki
Chen Vivian
Teijin Limited
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