Biaxially oriented laminated polyester film for magnetic recording media

Abstract

Abstract Translated from Japanese (57)【要約】 （修正有） 【課題】 表面平坦性、テープパンケーキの巻取り性、 走行耐久性（耐削れ性、耐スクラッチ性）、電磁変換特 性に優れ、かつ安価に製造することができる磁気記録媒 体用ポリエステルフイルムを提供する。 【解決手段】 ポリエステルＢ層の両面にポリエステル Ａ層（Ａ１層、Ａ２層）を積層した二軸配向積層ポリエ ステルフイルムであって、各層の厚みはＢ層＞Ａ１層＞ Ａ２層であり、ポリエステルＡ層に大粒径粒子０．００ １〜０．１重量％、中粒径粒子を０．０５〜０．５重量 ％、さらに平均２次粒径０．０１μｍ〜０．３μｍの小 粒径凝集粒子を０．０１〜０．５重量％含有し、そして ポリエステルＢ層は平均粒径０．３〜３．０μｍの粒子 を含有し、エア抜け時間（Ｔ：秒）と中粒径不活性粒子 の突起平均尖頭度（Ｌ）の比（Ｔ／Ｌ）が５０〜５００ ０００であることを特徴とする磁気記録媒体用二軸配向 積層ポリエステルフイルム。 (57) [Abstract] (with correction) [Problem] Surface flatness, winding property of tape pancake, Provided is a polyester film for a magnetic recording medium, which has excellent running durability (scratch resistance and scratch resistance) and electromagnetic conversion characteristics and can be manufactured at low cost. SOLUTION: This is a biaxially oriented laminated polyester film in which a polyester A layer (A1 layer, A2 layer) is laminated on both sides of a polyester B layer, and the thickness of each layer is B layer> A1 layer> A2 layer, and the polyester A layer has a large particle size of 0.00 1-0.1% by weight, 0.05-0.5% by weight of medium-sized particles, and 0.01-0.5% of small-sized aggregated particles having an average secondary particle size of 0.01-0.3 μm. %, And the polyester B layer contains particles having an average particle size of 0.3 to 3.0 μm, and the air bleeding time (T: seconds) and the average sharpness (L) of the protrusions of the medium-sized inert particles. Ratio (T / L) is 50 to 500 8000. A biaxially oriented laminated polyester film for magnetic recording media, wherein

Inventors

• 👤 Kei Mizutani
• 👤 圭 水谷
• 👤 Hideaki Watanabe
• 👤 秀明 渡辺

Bibliographic Details