JPS6411820A - Easily foldable polyester film - Google Patents

Easily foldable polyester film

Info

Publication number
JPS6411820A
JPS6411820A JP16824587A JP16824587A JPS6411820A JP S6411820 A JPS6411820 A JP S6411820A JP 16824587 A JP16824587 A JP 16824587A JP 16824587 A JP16824587 A JP 16824587A JP S6411820 A JPS6411820 A JP S6411820A
Authority
JP
Japan
Prior art keywords
film
copolymer
biaxially stretched
difference
mean refractive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP16824587A
Other languages
Japanese (ja)
Other versions
JP2505474B2 (en
Inventor
Koji Nakahara
Ryuichi Nagata
Nobutaka Funayama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toray Industries Inc
Original Assignee
Toray Industries Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toray Industries Inc filed Critical Toray Industries Inc
Priority to JP16824587A priority Critical patent/JP2505474B2/en
Publication of JPS6411820A publication Critical patent/JPS6411820A/en
Application granted granted Critical
Publication of JP2505474B2 publication Critical patent/JP2505474B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

PURPOSE:To obtain excellent easy foldability and dimensional stability by a method wherein film, which is made of polyethylene terephthalate copolymer and has a yield point and the difference between mean refractive indices in unstretched state and in biaxially stretched state of which is set to lie within the specified range. CONSTITUTION:The easily foldable polyester film concerned is a biaxially stretched film, which is made of polyethylene terephthalate (PET) copolymer and has a yield point in a stress-strain curve and satisfies the following relationship: 0.003<=N1-N0<=0.021, in which N0 denotes the mean refractive index of the unstretched film made of said copolymer and N1 denotes the mean refractive index of the biaxially stretched film made of said copolymer. If the difference between the refractive indices is smaller than 0.003, the orientation of the resultant film is not enough, resulting in being apt to fall behind in strength and heat resistance. On the other hand, if said difference is larger than 0.021, nearly no improvement in the easy foldability of film is obtained an unfavorable film results. Further, as the PET copolymer, copolymer, the crystallization of which is comparatively difficult, such as isophthalic acid copolymer, is apt to show higher easy moldability when processed in a biaxially stretched film.
JP16824587A 1987-07-06 1987-07-06 Easy folding polyester film Expired - Lifetime JP2505474B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16824587A JP2505474B2 (en) 1987-07-06 1987-07-06 Easy folding polyester film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16824587A JP2505474B2 (en) 1987-07-06 1987-07-06 Easy folding polyester film

Publications (2)

Publication Number Publication Date
JPS6411820A true JPS6411820A (en) 1989-01-17
JP2505474B2 JP2505474B2 (en) 1996-06-12

Family

ID=15864449

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16824587A Expired - Lifetime JP2505474B2 (en) 1987-07-06 1987-07-06 Easy folding polyester film

Country Status (1)

Country Link
JP (1) JP2505474B2 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02204020A (en) * 1989-02-01 1990-08-14 Diafoil Co Ltd Biaxially stretched polyester film for forming, formed-transferring film and formed container
EP0386450A2 (en) * 1989-02-01 1990-09-12 Diafoil Hoechst Co., Ltd Moldable biaxially stretched polyester film
JPH08132523A (en) * 1994-11-09 1996-05-28 Toray Ind Inc Low heat-shrinkable polyester film
JPH08164558A (en) * 1994-12-15 1996-06-25 Toray Ind Inc Polyester film
KR100541230B1 (en) * 2001-12-11 2006-01-10 에스케이씨 주식회사 Biaxially oriented polyester film
JP2007069521A (en) * 2005-09-08 2007-03-22 Toyobo Co Ltd Manufacturing method of biaxially stretched polyester film for twist wrapping
JP2007069523A (en) * 2005-09-08 2007-03-22 Toyobo Co Ltd Manufacturing method of biaxially stretched polyester film for twist wrapping
JP7029021B1 (en) * 2020-10-30 2022-03-02 タキロンシーアイ株式会社 Polyester shrink film

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02204020A (en) * 1989-02-01 1990-08-14 Diafoil Co Ltd Biaxially stretched polyester film for forming, formed-transferring film and formed container
EP0386450A2 (en) * 1989-02-01 1990-09-12 Diafoil Hoechst Co., Ltd Moldable biaxially stretched polyester film
JPH08132523A (en) * 1994-11-09 1996-05-28 Toray Ind Inc Low heat-shrinkable polyester film
JPH08164558A (en) * 1994-12-15 1996-06-25 Toray Ind Inc Polyester film
KR100541230B1 (en) * 2001-12-11 2006-01-10 에스케이씨 주식회사 Biaxially oriented polyester film
JP2007069521A (en) * 2005-09-08 2007-03-22 Toyobo Co Ltd Manufacturing method of biaxially stretched polyester film for twist wrapping
JP2007069523A (en) * 2005-09-08 2007-03-22 Toyobo Co Ltd Manufacturing method of biaxially stretched polyester film for twist wrapping
JP7029021B1 (en) * 2020-10-30 2022-03-02 タキロンシーアイ株式会社 Polyester shrink film
WO2022091355A1 (en) * 2020-10-30 2022-05-05 タキロンシーアイ株式会社 Polyester-based shrink film

Also Published As

Publication number Publication date
JP2505474B2 (en) 1996-06-12

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