US5753377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biaxially oriented polyester film for laminating metallic sheets
Assignee: Toray Industries Inc
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Filing: 1997-03-07
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Granted: 1998-05-19
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Expires: 2017-03-07
Abstract
Abstract A biaxially oriented polyester film is suitable for laminating onto a metallic sheet so as to provide a laminate capable of being formed into a can. The polyester film comprises at least one of: (1) a polyester having a melting point of 246° to 280° C. and being such that when the laminate is formed into a can, then at a neck of the can the film provides an inner 1 to 3 μm portion (a) close to the metallic sheet and an outer 1-3 μm portion (b) remote from the metallic sheet, which said portions (a) and (b) have respective average orientation intensity ratios, as measured by Raman spectrometry, of 6 or less and 8 or more; and (2) a polyester layer (A) of a polyester having at least 93 mol % thereof of units derived from ethylene terephthalate and/or ethylene naphthalate and a polyester layer (B) of a polyester containing an ionomer and which film has a face orientation factor of 0.10 to.0.15.
Inventors
- 👤 Kohzo Takahashi
- 👤 Masahiro Kimura
- 👤 Koichi Abe
- 👤 Yuzo Shimizu
- 👤 Masaru Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:36
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B15/09; B32B1/00; B32B27/00; B32B27/36; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2367/00; B32B2439/00; B32B2439/40; B32B2439/66; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31786
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
56 words
A biaxially oriented polyester film for laminating onto a metallic sheet, which film comprises a polyester having a melting point of 246° to 280° C., wherein said film has an inside average orientation ratio, RinAVE, and an outside average orientation ratio, RoutAVE, as measured by Raman spectrometry, of 6 or less and 8 or more, respectively.
Claim 2
Dependent Claim
56 words
A biaxially oriented polyester film for laminating onto a metallic sheet, which film comprises a polyester having a melting point of 246° to 280° C., wherein said film has an inside average orientation ratio, RinAVE, and an outside average orientation ratio, RoutAVE, as measured by Raman spectrometry, of 6 or less and 8 or more, respectively.
Claim 3
Dependent Claim
64 words
A biaxially oriented polyester film for laminating onto a metallic sheet, which film comprises a polyester layer (A) of a polyester having at least 93 mole % thereof of units derived from at least one of ethylene terephthalate and ethylene naphthalate and a polyester layer (B) of a polyester containing an ionomer and which film has a face orientation factor of 0.10 to 0.15.
Claim 4
Dependent Claim
64 words
A biaxially oriented polyester film for laminating onto a metallic sheet, which film comprises a polyester layer (A) of a polyester having at least 93 mole % thereof of units derived from at least one of ethylene terephthalate and ethylene naphthalate and a polyester layer (B) of a polyester containing an ionomer and which film has a face orientation factor of 0.10 to 0.15.
Claim 5
Dependent Claim
62 words
A biaxially oriented polyester film according to claim 1, which film comprises a polyester layer (A) of a polyester having at least 93 mole % thereof of units derived from at least one of ethylene terephthalate and ethylene naphthalate and a polyester layer (B) of a polyester containing an ionomer and which film has a face orientation factor of 0.10 to 0.15.
Claim 6
Dependent Claim
27 words
A biaxially oriented polyester film according to claim 2, wherein the polyester of the polyester layer (A) has a melting point of 246° C. to 280° C.
Claim 7
Dependent Claim
36 words
A biaxially oriented polyester film according to claim 1, wherein the mean value of the elongation at breakage thereof in each of the machine direction and the transverse direction of the film is 130% or more.
Claim 8
Dependent Claim
38 words
A biaxially oriented polyester film according to claim 1, wherein the mean value of the heat shrinkage thereof in each of the machine direction, and the transverse direction, of the film at 150° C. is 0.5% to 10%.
Claim 9
Dependent Claim
25 words
A biaxially oriented polyester film according to claim 1, wherein the crystalline size of (100) face obtained by X-ray diffractometry is 6 nm or less.
Claim 10
Dependent Claim
23 words
A biaxially oriented polyester film according to claim 2 or 3, wherein the polyester of the polyester layer (B) contains a crosslinking agent.
Claim 11
Dependent Claim
27 words
A biaxially oriented polyester film according to claim 1, comprising a polyester copolymerized with at least one of 2,6-naphthalenedicarboxylic acid, dimer acid, 1,4-hexamethylenedimethanol, 1,4-butanediol and isophthalic acid.
Claim 12
Dependent Claim
68 words
A biaxially oriented polyester film according to claim 1, which film consists of at least two layers, one of which said two layers is to lie close to the metallic sheet and the other of which said two layers is to lie remote from the metallic sheet, which said two layers have respective face orientation factors different from one another, which said difference therebetween is 0.001 to 0.05.
Claim 13
Dependent Claim
99 words
A biaxially oriented polyester film according to claim 1, which film consists of two polyester layers, one of which said two layers is to lie close to the metallic sheet and the other of which said two layers is to lie remote from the metallic sheet, the said one layer which is to lie close to the metallic sheet being of a polyester (C) having a melting point lower by 2° to 30° C. than the melting point of the polyester of the other of the said two polyester layers which is to lie remote from the metallic sheet.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-05-18 | 2001-11-17 | 2002-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-18 | 2005-11-17 | 2006-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-18 | 2009-11-17 | 2010-05-19 | $7700.00 | Window Closed / Lapsed |