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Title:
BIAXIALLY ORIENTED POLYETHYLENE NAPHTHALATE COPOLYMER FILM
Document Type and Number:
WIPO Patent Application WO/1998/050456
Kind Code:
A1
Abstract:
A biaxially oriented polyethylene naphthalate copolymer film, characterized by: (1) being substantially made from a polyethylene naphthalate copolymer which comprises ethylene naphthalate units in an amount of 92 to 99.5 mole % based on the total amount of the repeating units and contains at least one comonomer component selected from the group consisting of the following components (a) to (d) in an amount of 0.5 to 8 mole % based on the total amount of the dicarboxylic acid components: (a) glycols having a fluorene skeleton in the molecule, (b) p-hydroxymethylbenzoic acid, (c) p-hydroxyethoxybenzoic acid, and (d) p-hydroxyethoxybenzoic acid, (2) having moduli of longitudinal elasticity and transverse elasticity of each 500 kg/mm?2� or above, and (3) exhibiting delamination resistance in terms of rate of fold whitening of 10 % or below. The film has excellent delamination resistance, anticurling properties, mechanical strengths, color, hue and transparency, thus being valuable as a base film for photographic films.

Inventors:
TSUKAMOTO RYOJI (JP)
TERAMOTO MITSURU (JP)
ITO SEIJI (JP)
KOSUGE MASAHIKO (JP)
Application Number:
PCT/JP1998/002002
Publication Date:
November 12, 1998
Filing Date:
May 01, 1998
Export Citation:
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Assignee:
TEIJIN LTD (JP)
TSUKAMOTO RYOJI (JP)
TERAMOTO MITSURU (JP)
ITO SEIJI (JP)
KOSUGE MASAHIKO (JP)
International Classes:
C08G63/193; C08G63/60; C08J5/18; G03C1/795; G11B5/73; (IPC1-7): C08J5/18; C08G63/193; C08G63/60; G03C1/795; G11B5/704
Foreign References:
JPH0772584A1995-03-17
JPH0892390A1996-04-09
JPH06258768A1994-09-16
JPH08134194A1996-05-28
Other References:
See also references of EP 0922726A4
Attorney, Agent or Firm:
Ohshima, Masataka (Fukuya Building 3, Yotsuya 4-chom, Shinjuku-ku Tokyo, JP)
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