Claims
- 1. A process for the production of a gas barrier film, which comprises forming a film from a mixture containing (A) at least one poly(meth)acrylic acid polymer selected from the group consisting of poly(meth)acrylic acid and partially neutralized products of poly(meth)acrylic acid and (B) a saccharide in a weight ratio of 95:5 to 20:80, and then subjecting the film to a heat treatment under conditions in which the heat-treating temperature and the heat-treating time satisfy the following relationships (a) and (b):
- (a) log t.gtoreq.-0.0622.times.T+28.48
- (b) 373.ltoreq.T.ltoreq.573
- wherein t means the heat-treating time (min), and T denotes the heat-treating temperature (K).
- 2. The process as claimed in claim 1, wherein the poly(meth)acrylic acid is polyacrylic acid, polymethacrylic acid, a copolymer of acrylic acid and methacrylic acid, or a mixture of at least two polymers thereof, and has a number average molecular weight ranging from 2,000 to 250,000.
- 3. The process as claimed in claim 1, wherein the partially neutralized product of the poly(meth)acrylic acid is obtained by partially neutralizing carboxyl groups of the poly(meth)acrylic acid with an alkali.
- 4. The process as claimed in claim 1, wherein the partially neutralized product of the poly(meth)acrylic acid has a degree of neutralization within a range higher than 0%, but not higher than 20%, said degree of neutralization being determined by the following equation:
- Degree of neutralization=(X/Y).times.100
- wherein X means the number of moles of carboxyl groups neutralized in 1 g of the partially neutralized poly(meth)acrylic acid, and Y denotes the number of moles of carboxyl groups in 1 g of the poly(meth)acrylic acid before the partial neutralization.
- 5. The process as claimed in claim 1, wherein the saccharide is at least one selected from the group consisting of monosaccharides, sugar alcohols, oligosaccharides and polysaccharides.
- 6. The process as claimed in claim 1, wherein the saccharide is soluble in water.
- 7. The process as claimed in claim 1, wherein the polysaccharide is starch.
- 8. The process as claimed in claim 1, wherein the starch is modified starch soluble in water.
- 9. The process as claimed in claim 1, wherein the film is formed from a mixture containing the poly(meth)acrylic acid polymer and the saccharide in a weight ratio of 90:10 to 40:60.
- 10. The process as claimed in claim 1, wherein the film is formed from a mixture containing the poly(meth)acrylic acid polymer and the saccharide in a weight ratio of 85:15 to 50:50.
- 11. A process for the production of a gas barrier film, which comprises forming a film from a mixture containing (A) at least one poly(meth)acrylic acid polylmer selected from the group consisting of poly(meth)acrylic acid and partially neutralized products of poly(meth)-acrylic acid and partially neutralized products of poly(meth)-acrylic acid and (B) a saccharide in a weight ratio of 95:5 to 20:80, and then subjecting the film to a heat treatment under conditions in which the heat-treating temperature and the heat-treating time satisfy the following relationships (c) and (b):
- (c) log t.gtoreq.-0.0631.times.T+29.32
- (b) 373.ltoreq.T.ltoreq.573
- wherein t means the heat-treating time (min), and T denotes the heat-treating temperature (.degree.K).
- 12. A process for the production of a gas barrier film, which comprises forming a film of a mixture containing (A) at least one poly(meth)acrylic acid polymer selected from the group consisting of poly(meth)acrylic acid and partially neutralized products of poly(meth)-acrylic acid and (B) a saccharide in a weight ratio of 95:5 to 20:80, and then subjecting the film to a heat treatment under conditions in which the heat-treating temperature and the heat-treating time satisfy the following relationships (d) and (b):
- (d) log t.gtoreq.-0.0645.times.T+30.71
- (b) 373.ltoreq.T.ltoreq.573
- wherein t means the heat-treating time (min), and T denotes the heat-treating temperature (.degree.K).
Priority Claims (2)
Number |
Date |
Country |
Kind |
5-285739 |
Oct 1993 |
JPX |
|
6-194940 |
Jul 1994 |
JPX |
|
Parent Case Info
This application is a division of application Ser. No. 08/324,541 filed Oct. 18, 1994 U.S. Pat. No. 5,498,662.
US Referenced Citations (4)
Foreign Referenced Citations (10)
Number |
Date |
Country |
0608808 |
Aug 1994 |
EPX |
51-134737 |
Nov 1976 |
JPX |
57-133142 |
Aug 1982 |
JPX |
4-90339 |
Mar 1992 |
JPX |
4-114043 |
Apr 1992 |
JPX |
4-100913 |
Apr 1992 |
JPX |
4-114044 |
Apr 1992 |
JPX |
4-132748 |
May 1992 |
JPX |
5-92507 |
Apr 1993 |
JPX |
5-93092 |
Apr 1993 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Translation of Japan 51-134737. Nov. 1976. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
324541 |
Oct 1994 |
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