公开(公告)号：JPH07114726A

公开(公告)日：1995-05-02

申请号：JP26068593

申请日：1993-10-19

Applicant: TORAY INDUSTRIES

Inventor： ODAJIMA AKIO ,  ITO KIYOHIKO ,  KONDOU NORIKAZU

IPC: C08J5/18 ,  B29C55/12 ,  B29K67/00 ,  B29K105/16 ,  B32B27/36 ,  C08K3/36 ,  C08K7/16 ,  C08L67/00 ,  C08L67/02 ,  G11B5/73 ,  G11B5/733 ,  G11B5/704

Abstract: PURPOSE:To provide a polyester film excellent in running performance, running durability against repeated use, winding characteristics like a pancake and slitting characteristics and useful as a base film for a magnetic recording medium satisfying even the requirement of high image quality. CONSTITUTION:This polyester film contains 0.005-5.0wt.% spherical silica particles having 0.1-2.0mum volume average particle diameter and a relative standard deviation of >0.5 in polyester and further contains 0.005-5.0wt.% org. polymer particles having 0.1-2.0mum volume average particle diameter.

公开(公告)号：JPH07113014A

公开(公告)日：1995-05-02

申请号：JP26065693

申请日：1993-10-19

Applicant: TORAY INDUSTRIES

Inventor： ODAJIMA AKIO ,  ITO KIYOHIKO ,  KONDOU NORIKAZU

IPC: C08J5/18 ,  B29C55/12 ,  B29K67/00 ,  B29K105/16 ,  B32B27/36 ,  C08K3/26 ,  C08K3/36 ,  C08L67/00 ,  C08L67/02 ,  G11B5/73 ,  G11B5/704

Abstract: PURPOSE:To obtain the polyester film which contains spherical silica particles of a specific volume average particle diameter and a relative standard deviation and calcium carbonate particles of a specific volume average particle diameter, thus shows good running durability, pancake-rolling properties, and slit properties. CONSTITUTION:After ester-interchange reaction of terephthalic acid and ethylene glycol at 245 deg.C, the polycondensation reaction is effected together with phosphoric acid, antimony trioxide and spherical silica particles to prepare a polyester. Similar operations are repeated with calcium carbonate particles instead of the silica particles. Then, they are mixed, melt-extruded into film, oriented to provide the film containing 0.005 to 5.0wt. of spherical silica particles of 0.1 to 2.0mum volume average particle diameter and over 0.5 relative standard deviation defined by the formula (Di is the area circle diameter calculated from the projected areas of individual particles in mum; D is the number average value of Di in mum; n is the number of the particles measured) and 0.005 to 5.0wt.% of calcium carbonate particles of 0.1 to 2.0mum volume average particle diameter.

公开(公告)号：JPH07114722A

公开(公告)日：1995-05-02

申请号：JP26026493

申请日：1993-10-18

Applicant: TORAY INDUSTRIES

Inventor： ODAJIMA AKIO ,  ITO KIYOHIKO ,  KONDOU NORIKAZU

IPC: C08J5/18 ,  B29C55/12 ,  B29K67/00 ,  B29K105/16 ,  B32B27/36 ,  C08K3/22 ,  C08K3/36 ,  C08L67/00 ,  C08L67/02 ,  G11B5/70 ,  G11B5/73 ,  G11B5/733 ,  G11B5/704

Abstract: PURPOSE:To obtain a polyester film excellent in scratch resistance, running durability at the time of repeated use and slitting characteristics and useful as a base film for a magnetic recording medium satisfying even the requirement of high image quality. CONSTITUTION:This polyester film contains 0.005-5.0wt.% spherical silica particles having 0.1-2.0mum volume average particle diameter and a relative standard deviation of >0.5 in polyester and further contains aluminum oxide particles and/or zirconium oxide particles.