Stock material or miscellaneous articles – Structurally defined web or sheet – Continuous and nonuniform or irregular surface on layer or...
Reexamination Certificate
2006-10-17
2006-10-17
Chen, Vivian (Department: 1773)
Stock material or miscellaneous articles
Structurally defined web or sheet
Continuous and nonuniform or irregular surface on layer or...
C428S457000, C428S458000, C428S480000, C428S690000, C428S690000, C428S910000
Reexamination Certificate
active
07122241
ABSTRACT:
A biaxially oriented polyester film for a high-density magnetic recording medium, particularly a high-density magnetic recoding medium of linear recording system, which has high strength in longitudinal and transverse directions, excellent dimensional stability in a crosswise direction and is flat and excellent in output characteristics and a process for producing the same. The biaxially oriented film is made from polyethylene-2,6-naphthalate and has a Young's modulus in a longitudinal direction of 8 GPa or more, a Young's modulus in a transverse direction of 6 GPa or more, a temperature expansion coefficient in the transverse direction (αt) of −5×10−6/° C. to +12×10−6/° C., a humidity expansion coefficient in the transverse direction (αh) of 5×10−6/% RH to 12×10−6/% RH and a thermal shrinkage factor in the transverse direction at 105° C. of −0.5 to +1.5%.
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Kobayashi Ieyasu
Muro Shinji
Murooka Hirofumi
Chen Vivian
Sughrue & Mion, PLLC
Teijin Limited
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