Patent ID: 11927914
Assignee: SANYO CHEMICAL INDUSTRIES, LTD.
Field: Optics (Instruments)
Classification: CPC G  C | IPC C  G

Claim 0:
1. An electrophotographic toner composition comprising:
an electrophotographic toner binder, and colorant,, wherein,
a content of the electrophotographic toner binder in the electrophotographic toner composition is 30 to 97% by weight, and the electrophotographic toner binder comprises:
a polymer (A) containing a monomer (a) and a monomer (x) different from the monomer (a) as essential constituent monomers,
wherein the monomer (a) is behenyl (meth)acrylate, the polymer (A) has an acid value of 40 or less, and the polymer (A) satisfies the following relational expression (1):

1.1 (cal/cm3)0.5≤|SP(x)−SP(a)|≤8.0 (cal/cm3)0.5  relational expression (1):

wherein SP(a) is the solubility parameter (SP value) of a structural unit derived from the monomer (a) constituting the polymer (A); and SP(x) is the SP value of a structural unit derived from the monomer (x) different from the monomer (a) constituting the polymer (A),
wherein an amount of the monomer (a) as a constituent monomer constituting the polymer (A) is 30 to 99% by weight, based on the weight of the polymer (A),
wherein the monomer (x) includes at least one monomer (c) selected from the group consisting of vinylbenzene, methyl methacrylate, and methyl acrylate, and a monomer (b) having an ethylenically unsaturated bond, and at least one functional group selected from the group consisting of a nitrile group, a urethane group, a urea group, an imide group, an allophanate group, an isocyanurate group, and a biuret group, wherein the monomer (b) includes a monomer (b1) having a nitrile group and a monomer (b3) having a urea group.