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US 9,958,801 B2Granted
Toner and production method thereof
AssigneeCanon Kabushiki Kaisha
InventorsMasatake Tanaka, Yoshihiro Nakagawa, Naoya Isono, Harumi Takada, Reo Tagawa
Life of this patent
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Abstract
Provided is a toner including a toner particle containing a graft polymer, in which: the graft polymer has a crystalline polyester segment and an amorphous vinyl polymer segment; the crystalline polyester segment has a unit derived from a specific monomer (a) and a unit derived from a specific monomer (b); a content X (mol %) of the unit derived from the monomer (b) calculated from a specific formula is 1.0 mol % or more and 24 mol % or less; and a melting point of the graft polymer is 50° C. or more and 85° C. or less.
Claims10
A toner, comprising a toner particle containing a binder resin, comprising:
- a graft polymer having (i) an amorphous vinyl polymer segment and a crystalline polyester segment branched from the amorphous vinyl polymer segment, or (ii) a crystalline polyester segment and an amorphous vinyl polymer segment branched from the crystalline polyester segment;
- the crystalline polyester segment comprising a unit derived from a monomer (a) and a unit derived from a monomer (b), monomer (a) being one or more monomers selected from the group consisting of a C2-11 α,ω-straight-chain aliphatic diol, a C2-13 α,ω-straight-chain aliphatic dicarboxylic acid, a C2-12 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid, an intramolecular acid anhydride of a C2-13 α,ω-straight-chain aliphatic dicarboxylic acid, an alkyl ester of a C2-13 α,ω-straight-chain aliphatic dicarboxylic acid, an alkyl ester of a C2-12 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid and a lactonized compound of a C2-12 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid, and monomer (b) being one or more monomers selected from the group consisting of a C12-22 α,ω-straight-chain aliphatic diol, a C14-24 α,ω-straight-chain aliphatic dicarboxylic acid, a C13-23 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid, an intramolecular acid anhydride of a C14-24 α,ω-straight-chain aliphatic dicarboxylic acid, an alkyl ester of a C14-24 α,ω-straight-chain aliphatic dicarboxylic acid, an alkyl ester of a C13-23 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid and a lactonized compound of a C13-23 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid, wherein
- the crystalline polyester segment has a content X (mol %) of the unit derived from the monomer (b) of 1.0 to 20 mol % as calculated from X={Mb/(Ma+Mb)}×100 where Ma (mol/g) is the number of moles of the unit derived from the monomer (a) per unit mass, and Mb (mol/g) is the number of moles of the unit derived from the monomer (b) per unit mass, and
- a melting point of the graft polymer is 50 to 85° C.
1 more element
A method of producing a toner, comprising the steps of:
- granulating a polymerizable monomer composition containing a polymerizable monomer capable of forming the binder resin and a graft polymer in an aqueous medium to polymerize the polymerizable monomer composition, wherein
- the toner comprises a toner particle containing a binder resin,
- the binder resin comprising:
- a graft polymer having (i) an amorphous vinyl polymer segment and a crystalline polyester segment branched from the amorphous vinyl polymer segment, or (ii) a crystalline polyester segment and an amorphous vinyl polymer segment branched from the crystalline polyester segment;
- the crystalline polyester segment comprising a unit derived from a monomer (a) and a unit derived from a monomer (b), monomer (a) being one or more monomers selected from the group consisting of a C2-11 α,ω-straight-chain aliphatic diol, a C2-13 α,ω-straight-chain aliphatic dicarboxylic acid, a C2-12 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid, an intramolecular acid anhydride of a C2-13 α,ω-straight-chain aliphatic dicarboxylic acid, an alkyl ester of a C2-13 α,ω-straight-chain aliphatic dicarboxylic acid, an alkyl ester of a C2-12 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid and a lactonized compound of a C2-12 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid, and monomer (b) being one or more monomers selected from the group consisting of a C12-22 α,ω-straight-chain aliphatic diol, a C14-24 α,ω-straight-chain aliphatic dicarboxylic acid, a C13-23 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid, an intramolecular acid anhydride of a C14-24 α,ω-straight-chain aliphatic dicarboxylic acid, an alkyl ester of a C14-24 α,ω-straight-chain aliphatic dicarboxylic acid, an alkyl ester of a C13-23 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid and a lactonized compound of a C13-23 α,ω-straight-chain aliphatic monohydroxymonocarboxylic acid, wherein
- the crystalline polyester segment has a content X (mol %) of the unit derived from the monomer (b) of 1.0 to 20 mol % as calculated from X={Mb/(Ma+Mb)}×100 where Ma (mol/g) is the number of moles of the unit derived from the monomer (a) per unit mass, and Mb (mol/g) is the number of moles of the unit derived from the monomer (b) per unit mass, and
- a melting point of the graft polymer is 50 to 85° C.
4 more elements
Dependencies are inferred from the claim text.