Claims
- 1. A gas barrier film which comprises a polyester based resin substrate having thereon a gas barrier coating, which coating comprises a water soluble or water dispersible high polymer and inorganic stratified particles and which coating has a surface remote from the substrate, wherein said surface has surface roughness parameter Rt/Ra of 25 or less, a number of undulations having a diameter of 25 to 100 .mu.m of 1 to 80 undulations/mm.sup.2 and said coating has a water content of 3 mg/cm.sup.3 or less.
- 2. A gas barrier film according to claim 1, wherein number of any surface defects of 0.2 .mu.m or more on the said coating surface is 5 per 10 cm.sup.2 or less.
- 3. A gas barrier film according to claim 1, wherein the relative intensity of a peak in the infra-red spectrum originating from polar groups of the water soluble or water dispersible polymer satisfies the following formula:
- P=100.times.(Pw-Pd)/Pd<35
- Pw: Relative intensity of a peak originating from polar groups of the water soluble or water dispersible polymer in a wet condition;
- Pd: Relative intensity of a peak originating from polar groups of the water soluble or water dispersible polymer in a dry condition.
- 4. A gas barrier film according to claim 1, wherein the coating contains 0.01 to 10 wt % of a crosslinking agent as a monomer component.
- 5. A gas barrier film according to claim 1, wherein the coating is oriented in at least one direction.
- 6. A gas barrier film according to claim 1, wherein the water soluble or water dispersible high polymer is a polyvinyl alcohol based polymer or any of its derivatives.
- 7. A gas barrier film according to claim 6, wherein the polyvinyl alcohol based polymer or any of its derivatives has at least two different constituents thereof.
- 8. A gas barrier film according to claim 1, wherein the inorganic stratified particles comprise particles having a diameter of 200 nm or less.
- 9. A gas barrier film according to claim 1, wherein the inorganic stratified particles comprise particles having a diameter of 1 .mu.m or more.
- 10. A gas barrier film according to claim 1, wherein the coating contains at least two kinds of inorganic stratified particle having different respective diameters.
- 11. A gas barrier film according to claim 1, having a heat shrinkage at 120.degree. C. of 1% or less.
- 12. A gas barrier film according to claim 1, wherein a layer of a metal and/or metallic oxide is formed on the coating.
- 13. A gas barrier film according to claim 1, wherein a layer of a metal and/or metallic oxide is formed between the coating and the thermoplastic resin substrate.
- 14. A gas barrier film according to claim 1, wherein the coating has a water content of 2 mg/cm.sup.3 or less.
- 15. A gas barrier film according to claim 1, wherein the coating has a water content of 1.5 mg/cm.sup.3 or less.
- 16. A gas barrier film according to claim 1, wherein the surface roughness parameter Rt/Ra of about 20 or less.
- 17. A gas barrier film according to claim 1, wherein the surface roughenss parameter Rt/Ra of about 17 or less.
Priority Claims (3)
Number |
Date |
Country |
Kind |
8-083710 |
Apr 1996 |
JPX |
|
8-165837 |
Jun 1996 |
JPX |
|
8-254326 |
Sep 1996 |
JPX |
|
Parent Case Info
This application is a divisional of application Ser. No. 08/825,338, filed on Mar. 28, 1997, now U.S. Pat. No. 5,981,029.
US Referenced Citations (8)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0301878 |
Feb 1989 |
EPX |
0518647 |
Dec 1992 |
EPX |
0691376 |
Jan 1996 |
EPX |
3093542 |
Apr 1998 |
JPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
825338 |
Mar 1997 |
|