Patent ID: 9490484
Filing Date: 2016-11-08
CPC Classification: C08F,H01M,Y02E,Y02P

Claim Text:
1. A binder composition for a storage battery device, comprising: a binder which comprises a fluorinated copolymer comprising structural units (a) derived from tetrafluoroethylene and structural units (b) derived from propylene, wherein the molar ratio (a)/(b) is from 40/60 to 48/52, and the total of the structural units (a) and the structural units (b) is at least 90 mol % with respect to all structural units included in the binder; and a medium, wherein the medium is an aqueous medium, and particles made of the fluorinated copolymer are dispersed in the aqueous medium, and the average particle size of the particles made of the fluorinated copolymer is from 10 to 200 nm.