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US5939205A Expired / Lapsed US ⏱️ 0.0 years remaining

Gas barrier resin film

Assignee: Toyobo Co Ltd
•
Filing: 1997-04-15
•
Granted: 1999-08-17
•
Expires: 2017-04-15
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Abstract

Abstract A gas barrier film comprising a polyamide film and an inorganic deposited layer laminated thereon, wherein the maximum shrinkage percentage after boiling treatment at 95° C. for 30 minutes is not more than 3.5%. The gas barrier film of the present invention has excellent gas barrier property and water vapor-proof property even after boiling or retort treatment. Hence, the film of the present invention can serve well as a wrapping material for a wide range of objects that require high gas barrier property, such as food, medical products, industrial materials and the like, and has great industrial value.

Inventors

  • 👤 Seiichiro Yokoyama
  • 👤 Shigeru Komeda
  • 👤 Kiyoshi Iseki
  • 👤 Yozo Yamada
  • 👤 Chikao Morishige
  • 👤 Hideyuki Mitamura
  • 👤 Satoshi Osame
  • 👤 Shinji Fujita

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-10 02:15
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/048; B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/308; B32B27/32; B32B27/34; B32B27/36; B32B7/00; B32B7/04; B32B7/12; C08J7/042; C08J7/0423; C08J7/043; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; C08J2379/00; C08J2379/04; C08J2379/08; C08J2423/00; C08J2423/02; C08J2423/04; C08J2423/06; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/3175; Y10T428/31765

Claims Analysis

Total Claims: 17
Claim 1
Independent Claim 64 words
A gas barrier film comprising an inorganic vapor deposited layer and a polyamide film having a 0.01-1 μm thick anchor coat layer formed on at least one side thereof, said deposited layer being directly laminated on the anchor coat layer, wherein the gas barrier film has a maximum shrinkage percentage after boiling treatment at 95° C. for 30 minutes of not more than 3.5%.
Claim 2
Dependent Claim 64 words
A gas barrier film comprising an inorganic vapor deposited layer and a polyamide film having a 0.01-1 μm thick anchor coat layer formed on at least one side thereof, said deposited layer being directly laminated on the anchor coat layer, wherein the gas barrier film has a maximum shrinkage percentage after boiling treatment at 95° C. for 30 minutes of not more than 3.5%.
Claim 3
Dependent Claim 25 words
The film of claim 1, wherein the polyamide film has the maximum shrinkage stress at 170° C. of not more than 900 gf/mm 2 .
Claim 4
Dependent Claim 28 words
The film of claim 1, wherein the polyamide film has the maximum shrinkage percentage after heat treatment at 170° C. for 10 minutes of not more than 3.5%.
Claim 5
Dependent Claim 110 words
The film of claim 3, wherein the polyamide film is obtained by first drawing an unoriented polyamide film 2.5-4.0 times in the machine direction at a temperature of not less than (Tg+10)° C. and not more than (Tc+20)° C., 1.1-2.9 times in the transverse direction at not less than (Tc+20)° C. and not more than (Tc+70)° C., and then in the transverse direction at not less than (Tc+70)° C. and not more than (Tm-30)° C., so that the total transverse draw ratio becomes 3.0-4.5, and then applying 0-10% relaxing heat treatment in the transverse direction using a tenter at not less than (Tm-30)° C. and not more than (Tm-10)° C.
Claim 6
Dependent Claim 39 words
The film of claim 1, wherein an adhesion strength between the polyamide film and the inorganic deposited layer after boiling treatment at 95° C. for 30 minutes as determined in the air is not less than 100 g/15 mm.
Claim 7
Dependent Claim 38 words
The film of claim 1, wherein an adhesion strength between the polyamide film and the inorganic deposited layer after boiling treatment at 95° C. for 30 minutes as determined in water is not less than 50 g/15 mm.
Claim 8
Dependent Claim 24 words
The film of claim 1, wherein the anchor coat layer has a compression modulus of not less than 3.0 kgf/mm 2 at 40° C.
Claim 9
Dependent Claim 25 words
The film of claim 1, wherein the anchor coat layer comprises a polyester resin or a graft copolymer of a polyester and an acrylic polymer.
Claim 10
Dependent Claim 16 words
The film of claim 1, further comprising a sealant layer laminated on the inorganic deposited layer.
Claim 11
Dependent Claim 82 words
The film of claim 9, wherein the sealant layer is a polyolefin resin film having a compression modulus of not less than 8 kgf/mm 2 at 95° C. and a Vicat softening point of not more than 145° C., and the maximum shrinkage percentage of the gas barrier resin film after boiling treatment at 95° C. for 30 minutes relative to the maximum shrinkage percentage of the polyamide film after boiling treatment at 95° C. for 30 minutes is less than 70%.
Claim 12
Dependent Claim 19 words
The film of claim 9, further comprising an adhesive layer between the inorganic deposited layer and the sealant layer.
Claim 13
Dependent Claim 23 words
The film of claim 11, wherein the adhesive layer has a compression modulus of not less than 8.8 kgf/mm 2 at 40° C.
Claim 14
Dependent Claim 26 words
The film of claim 1, having an oxygen permeability after boiling treatment at 95° C. for 30 minutes of not more than 15 cc/m 2 ·atm·day.
Claim 15
Dependent Claim 27 words
The film of claim 1, having a water vapor transmission after boiling treatment at 95° C. for 30 minutes of not more than 10 g/m 2 ·day.
Claim 16
Dependent Claim 44 words
The film of claim 1, having a peeling strength of not less than 500 g/15 mm as measured by a 90° peel test after heat sealing two sheets of said film at 2 kgf/cm 2 for one second at not more than 160° C.
Claim 17
Dependent Claim 22 words
The film of claim 1, having a blocking property as measured according to ASTM-D 1893-67 of not more than 10 g/20 mm.

References Cited (Backward Citations)

JPS5148511A Cited
JPS62101428A Cited
JPH01267036A Cited
US5126211A Cited
DE4344438A1 Cited
JPH07276571A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2002-08-16 2003-02-15 2003-08-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2006-08-16 2007-02-15 2007-08-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2010-08-16 2011-02-15 2011-08-17 $7700.00 Window Closed / Lapsed

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