Chapter 2 Novelty and Inventive Step - Japan Patent Office

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Part II Chapter 2 Novelty and Inventive Step Example 7 Type: 5 Description in the application concerned 【Claim 1】 A polyester film for a magnetic recording medium including inactive particles in 3 – 15 w% and whose thickness is 20μm or less, where it meets the following requirements; the ratio d/t is 0.01 – 0.04, where d means the average diameter of contained particles and t means the thickness of the base film; and, the planar orientation coefficient Ns and the average refractive index na meet the relational expression below; Ns 1.53na – 2.33 【Detailed description of the invention】 ... The film satisfying the relation of Ns greater than or equal to 1.53na–2.33 has a high Young's modulus in height and width as over 750kg/mm 2 . When it satisfies the relation above, it has an excellent electromagnetic conversion property, over +2.0dB, used as a magnetic tape… [Working example 1] ... Measuring the Young's modulus of the polyethylene terephthalate film obtained in this way, it was read as 850kg/mm 2 in height and 750kg/mm 2 in width, and the electromagnetic conversion property was read as +2.0dB. Cited document 【Title of the invention】 Polyester films for magnetic recording medium 【Working example】 The un-stretched film of 180μm was obtained by the process that polyethylene terephthalate containing 10 w% of titanium oxide whose average particle diameter is 0.2μm was melted and extruded at 300 degrees centigrade, and then rapidly solidified. After the unstretched film was stretched 3.7-fold in height and width at the temperature of 150 degrees centigrade, it was treated with heat at 210 degrees centigrade for 10 seconds, and then, a stretched film of 6.5μm in thickness was obtained. The Young's modulus of this film was measured as 870kg/mm 2 in height and 900kg/mm 2 in width, and the electromagnetic conversion property of this film was measured as +3.0dB. [Working example 2] ... Measuring the Young's modulus of the polyethylene-2,6-naphthalate film obtained in this way, it was read as 750kg/mm 2 in height and 870kg/mm 2 in width, and the electromagnetic conversion property was read as +2.0dB. Explanation It is not described in the cited document that the planar orientation coefficient Ns and the average refractive index na satisfy the relation of “Ns 1.53na – 2.33”. However, the description in the claimed invention says that the Young's modulus in height and width and the electromagnetic conversion property would be improved as an effect of satisfying the said relation. Moreover, the concrete values are almost the same as those of the Young's modulus and the electromagnetic conversion property described in the cited document. Consequently, a reasonable doubt that the claimed film is prima facie identical 38
Part II Chapter 2 Novelty and Inventive Step to the film described in the cited document, which achieves the same level of advantageous effect by satisfying the above described relation between the planar orientation coefficient Ns and the average refractive index na, is upheld. 39
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Chapter 2 Novelty and Inventive Step - Japan Patent Office

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