Patent ID: 11870075
Assignee: ZEON CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C  Y | IPC C  H

Claim 0:
1. A binder composition for a non-aqueous secondary battery electrode, comprising
a particulate polymer A1 and a particulate polymer B, wherein
the particulate polymer A1 includes isoprene unit in a proportion of at least 90 mass % and not more than 99 mass % and a carboxylic acid group-containing monomer unit in a proportion of at least 1 mass % and not more than 5 mass %,
the particulate polymer A1 is a graft copolymer,
a graft portion of the particulate polymer A1 is composed of only carboxylic acid group-containing monomer units,
a polymer forming a trunk portion of the particulate polymer A1 is natural rubber and is free of styrene unit,
the particulate polymer A1 has a volume average particle diameter of at least 0.6 μm and not more than 2.5 μm,
the particulate polymer B includes an aliphatic conjugated diene monomer unit as a repeating unit and further contains either or both of an aromatic vinyl monomer unit and a monomer unit other than the aliphatic conjugated diene monomer unit and the aromatic vinyl monomer unit,
the particulate polymer B has a volume average particle diameter of at least 0.01 μm and less than 0.6 μm, and
content of the particulate polymer A1 is at least 50 mass % and not more than 90 mass % of total content of the particulate polymer A1 and the particulate polymer B.