	US 11,807,698 B2
	Binder for non-aqueous secondary battery porous membrane-use, composition for non-aqueous secondary battery porous membrane-use, porous membrane for non-aqueous secondary battery-use, and non-aqueous secondary battery
Tomokazu Sasaki, Tokyo (JP)
Assigned to ZEON CORPORATION, Tokyo (JP)
Appl. No. 15/117,639
Filed by ZEON CORPORATION, Tokyo (JP)
PCT Filed Feb. 24, 2015, PCT No. PCT/JP2015/000938 § 371(c)(1), (2) Date Aug. 9, 2016, PCT Pub. No. WO2015/145967, PCT Pub. Date Oct. 1, 2015.
Claims priority of application No. 2014-060528 (JP), filed on Mar. 24, 2014.
Prior Publication US 2016/0351873 A1, Dec. 1, 2016
Int. Cl. C08F 212/08 (2006.01); H01M 50/446 (2021.01); H01M 50/417 (2021.01); H01M 50/423 (2021.01); H01M 4/62 (2006.01); C08L 33/08 (2006.01); H01M 50/46 (2021.01); C08F 220/18 (2006.01); C08F 220/68 (2006.01); C08K 3/22 (2006.01); H01M 10/05 (2010.01); H01M 10/0566 (2010.01); H01M 10/0525 (2010.01)

CPC C08F 212/08 (2013.01) [C08F 220/1808 (2020.02); C08F 220/68 (2013.01); C08K 3/22 (2013.01); C08L 33/08 (2013.01); H01M 4/622 (2013.01); H01M 10/05 (2013.01); H01M 50/417 (2021.01); H01M 50/423 (2021.01); H01M 50/446 (2021.01); H01M 50/46 (2021.01); C08K 2003/2227 (2013.01); H01M 10/0525 (2013.01); H01M 10/0566 (2013.01)]

7 Claims

1. A binder for non-aqueous secondary battery porous membrane-use comprising

a particulate polymer, wherein

the particulate polymer is a random copolymer including at least 45 mass % of an alkyl (meth)acrylate monomer unit, at least 20 mass % and no greater than 50 mass % of an aromatic monovinyl monomer unit, and at least 0.5 mass % and no greater than 3 mass % of a cross-linkable monomer unit,

an alkyl (meth)acrylate monomer used to form the alkyl (meth)acrylate monomer unit is at least one selected from a group consisting of 2-ethylhexyl acrylate and octyl acrylate,

an aromatic monovinyl monomer used to form the aromatic monovinyl monomer unit is at least one selected from the group consisting of styrene, α-methylstyrene, vinyltoluene, and 4-(tert-butoxy)styrene,

a degree of swelling of the particulate polymer with respect to a non-aqueous electrolysis solution is greater than a factor of 1 and no greater than a factor of 1.8,

the particulate polymer has one glass-transition temperature,

the glass-transition temperature is no higher than 5° C.,

the contact angle with water of the particulate polymer is greater than 80° and no greater than 120°, and

the degree of swelling is measured using the non-aqueous electrolysis solution that is obtained by dissolving LiPF₆as a supporting electrolyte with a concentration of 1 mol/L in a mixed solvent of ethylene carbonate, diethyl carbonate, and vinyl carbonate with volume mixing ratio of 68.5:30:1.5.