| US 7,476,712 B2 | ||
| Film and process for producing the same | ||
| Hideaki Tanaka, Ibaraki (Japan); Hiroyuki Oba, Ibaraki (Japan); Masahiro Yamazaki, Ibaraki (Japan); and Tomohisa Hasegawa, Ibaraki (Japan) | ||
| Assigned to Kureha Corporation, Tokyo (Japan) | ||
| Appl. No. 10/511,893 PCT Filed Apr. 23, 2003, PCT No. PCT/JP03/05173 § 371(c)(1), (2), (4) Date Jan. 19, 2005, PCT Pub. No. WO03/091317, PCT Pub. Date Nov. 06, 2003. |
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| Claims priority of application No. 2002-121246 (JP), filed on Apr. 23, 2002. | ||
| Prior Publication US 2005/0131162 A1, Jun. 16, 2005 | ||
| Int. Cl. C08F 8/42 (2006.01); C08F 20/04 (2006.01); C08F 20/06 (2006.01) | ||
| U.S. Cl. 525—330.2 [525/360; 525/366; 525/367; 525/368; 525/369; 525/370; 525/371; 525/372; 525/373; 525/329.7; 526/317.1] | 26 Claims |
| 1. A film which consists essentially of a polyvalent metal salt of a carboxylic acid which is the reaction product of carboxyl groups of a poly(carboxylic acid) polymer (A) with a polyvalent metal compound (B), wherein the poly(carboxylic acid) polymer (A) is a homopolymer of an α,β-monoethylenically unsaturated carboxylic acid or copolymer of at least two types of α,β-monoethylenically unsaturated carboxylic acids or a mixture of at least two such polymers, wherein said α,β-monoethylenically unsaturated carboxylic acid is selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid and crotonic acid, wherein the film exhibits a peak ratio (A1560/A1700) of a height A1560 of an absorption peak at a wave number of 1560 cm−1 to a height A1700 of an absorption peak at a wave number of 1700 cm−1 as determined by infrared absorption spectrum of the film which is at least 0.25, and wherein the film is soluble in a 1 N aqueous hydrochloric acid solution and/or a 1 N aqueous sodium hydroxide solution at room temperature for 24 hours. |