| US 7,579,115 B2 | ||
| Gelling agent for alkaline battery and alkaline battery | ||
| Kazuya Ohtani, Kyoto (Japan); and Takeaki Yamaguchi, Kyoto (Japan) | ||
| Assigned to Sanyo Chemical Industries, Ltd., Kyoto (Japan) | ||
| Appl. No. 11/631,651 PCT Filed Jul. 06, 2005, PCT No. PCT/JP2005/012503 § 371(c)(1), (2), (4) Date Jan. 05, 2007, PCT Pub. No. WO2006/006471, PCT Pub. Date Jan. 19, 2006. |
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| Claims priority of application No. 2004-201441 (JP), filed on Jul. 08, 2004. | ||
| Prior Publication US 2007/0231703 A1, Oct. 04, 2007 | ||
| Int. Cl. H01M 6/14 (2006.01); H01M 10/26 (2006.01) | ||
| U.S. Cl. 429—300 [429/188; 429/189; 429/206] | 11 Claims |
| 1. A gelling agent for use in an alkaline battery, the gelling agent comprising a cross-linked polymer (A) formed with a (meth)acrylic
acid (salt) as a principal constituent monomer unit,
wherein the gelling agent allows an obtained gel (GA) to have a viscosity ratio (N1/N60), determined as follows, of 0.7 to
1.3, and includes components soluble in 37 wt % aqueous solution of potassium hydroxide that account for 30 wt % or less of
the gelling agent:
the viscosity ratio (N1/N60) of the gel (GA) is determined by preparing the gel (GA) by stirring 100 parts by weight of 37
wt % aqueous solution of potassium hydroxide, 2 parts by weight of the cross-linked polymer (A), and 200 parts by weight of
zinc powder at 40° C. so as to be mixed uniformly, and measuring a viscosity (40° C., N1) of the gel (GA) after being left
to stand at the same temperature for one day, and a viscosity (40° C., N60) of the gel (GA) after being left to stand at the
same temperature for sixty days, according to JIS K7117-1: 1999, and
wherein the cross-linked polymer (A) includes a cross-linking agent (b) unit that is decomposed by hydrolysis in an alkaline
environment, and a cross-linking agent (c) unit that is not decomposed by hydrolysis in an alkaline environment.
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