Title:
EASILY ADHERING BIAXIALLY ORIENTED POLYESTER FILM
Document Type and Number:
Japanese Patent JP3226858
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an easily adhering polyester film especially as a film for high density magnetic recording medium while excellent electro-magnetic conversion characteristics are provided, and excellent MAG bond properties, blocking resistance, and chipping resistance are provided.
SOLUTION: An application layer having 100 pts.wt. of water dispersive copolymer polyester resin and 5-50 pts.wt. of colloidal particle of 10-50nm mean particle size is provided to at least one face of a polyester film of 2-11μm thickness. The thickness (nm) of the application layer and the mean particle size (nm) of the colloidal particle thereof satisfy the formula (0.2 ≤ (thickness of the application layer/the mean particle size of colloidal particle) ≤ 2.0 a surface roughness WRa on the application layer side of the polyester film is 0.5 to 10nm, WRz is 5-200nm, thermal balance at 80°C×1hr is 0.3% or under, and both of horizontal and vertical Young's modulus are 500kg/mm2 or over.
Inventors:
Ieyasu Kobayashi
Toshifumi Ohsawa
Masafumi Koseki
Toshifumi Ohsawa
Masafumi Koseki
Application Number:
JP31506797A
Publication Date:
November 05, 2001
Filing Date:
November 17, 1997
Export Citation:
Assignee:
Teijin Limited
International Classes:
B05D7/04; B05D7/24; B29C55/12; B32B27/20; B32B27/36; C08G63/688; C08J7/04; C09D133/00; C09D167/00; C09J167/02; B29K67/00; B29L7/00; B29L9/00; (IPC1-7): B32B27/36; B32B27/20; C08J7/04
Domestic Patent References:
| JP820656A | ||||
| JP58193149A | ||||
| JP6116487A |
Attorney, Agent or Firm:
Sumihiro Maeda