Title:
POLYESTER FILM
Document Type and Number:
Japanese Patent JP3531284
Kind Code:
B2
Abstract:
PURPOSE: To enhance the dimensional stability and mechanical strength of a polyester film by setting the ratio of dynamic loss at specific temp. to a specific range.
CONSTITUTION: The ratio of the dynamic loss tanδ at 95°C of a polyester film is set to 1.05-15, pref., 1.05-1.4. When polyester is polyethylene-2,6-naphthalate, the dispersion peak of tanδ is observed in the vicinity of 95°C and this dispersion peak is considered to be based on the motion of a naphthalene ring and, when the ratio of tank at 95°C is within this range, the motion of molecules is restrained and the dimensional change by heat of the film and the deformation at a time of the reception of long-time stress of the film are hard to generate.
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Inventors:
Minamizawa, Hidehito
Tsunashima, Kenji
Toyoda, Katsuya
Tsunashima, Kenji
Toyoda, Katsuya
Application Number:
JP12571795A
Publication Date:
May 24, 2004
Filing Date:
April 25, 1995
Export Citation:
Assignee:
TORAY IND INC
International Classes:
C08J5/18; B29C55/12; C08G63/181; C08G63/189; B29K67/00; B29L7/00; (IPC1-7): B29C55/12; C08G63/189; C08J5/18
Attorney, Agent or Firm:
伴 俊光