JP2015114666A5

JP2015114666A5 -

Info

Publication number: JP2015114666A5
Application number: JP2014240579A
Authority: JP
Filing date: 2014-11-27
Publication date: 2017-12-28
Anticipated expiration: 2034-11-27

Claims

The monomer ratio in the copolymer is 69 to 90 parts styrene, 9 to 30 parts n-butyl acrylate and 1 to 10 parts β-carboxyethyl acrylate, and the copolymer has a weight average molecular weight of 30, A styrene-butyl acrylate-β-carboxyethyl acrylate copolymer having a number average molecular weight in the range of 8,000 to 15,000 within a range of 000 to 40,000 ;
Fisher Tropsch wax is present in an amount ranging from 7% to 11% by weight based on the toner composition and paraffin wax wax is from 1.5% to 2.7% by weight based on the toner composition. A wax comprising Fisher Tropsch wax and paraffin wax wax present in an amount in the range of
And optional colorant, the toner particles comprising a including toner composition,
The toner particles are 0 . 940 to 0 . Has a circularity in the range of up to 999,
The toner particles are : 4 to 1 . Containing wax domains having an aspect ratio in the range of up to 8, wherein the toner particles are 1 . 3 to 1 . A toner composition comprising wax domains having a roundness within a range of up to 6.

The Fisher Tropsch wax and the paraffin wax constitute a total wax component, wherein the total wax component is present in the toner particles in an amount in the range of 10 weight percent to 12 weight percent. Toner composition .

The toner composition of claim 1, wherein the toner particles contain a pigment colorant in an amount in the range of 5 weight percent to 7 weight percent , based on the total weight of the toner composition .

The toner composition according to claim 1, wherein the toner composition is an emulsion aggregation toner.

A toner composition comprising toner particles having a core and a shell on the core, the core comprising:
A styrene acrylate resin having a weight average molecular weight in the range of 30,000 to 40,000, wherein the molar ratio of monomers in the copolymer is in the range of 69 parts to 90 parts of styrene, from 9 parts A styrene acrylate resin comprising a styrene-butyl acrylate-β-carboxyethyl acrylate copolymer that is n-butyl acrylate in the range of up to 30 parts and β-carboxyethyl acrylate in the range of 1 to 10 parts;
Two or more waxes including at least polymethylene wax and paraffin wax;
An optional colorant; and
The Tg of the core is lower than the Tg of the shell,
The toner particles have a circularity in the range of 0.940 to 0.999;
The toner particles contain wax domains having an aspect ratio in the range of 1.4 to 1.8, and the toner particles have a roundness in the range of 1.3 to 1.6 Containing domains,
Toner composition.

The toner composition according to claim 5, wherein the shell includes a styrene acrylate copolymer.

The toner composition of claim 5, wherein the shell comprises from 26 weight percent to 30 weight percent of the total weight of the shell-coated toner particles.

The toner composition of claim 5, wherein the styrene acrylate resin is present in the toner particles in a range from 82 weight percent to 86 weight percent.

(A) (1) The monomer ratio in the copolymer is 69-90 parts styrene, 9-30 parts n-butyl acrylate and 1-10 parts β-carboxyethyl acrylate, Styrene-butyl acrylate-β-carboxyethyl acrylate having a weight average molecular weight in the range of 30,000 to 40,000 and a number average molecular weight of the copolymer in the range of 8,000 to 15,000 A copolymer;
(2) Fisher Tropsch wax is present in an amount ranging from 7% to 11% by weight based on the toner composition, and paraffin wax wax is from 1.5% to 2.7% based on the toner composition. A wax dispersion comprising Fisher Tropsch wax and paraffin wax wax present in an amount ranging up to% by weight;
(3) an optional colorant dispersion;
(4) making a slurry containing particles by preparing an emulsion comprising any additive dispersion;
(B) agglomerating particles from the slurry;
(C) optionally adding a second polymer latex to further agglomerate the particles forming a shell on the particles;
(D) stopping aggregation of the particles;
(E) preheating the slurry of agglomerated particles;
(F) raising the pH of the slurry of aggregated particles;
(G) continuously passing the aggregated particles through a system including at least one heat exchanger to fuse the aggregated particles to form toner particles;
(H) raising the pH of the fused toner particles subsequent to passing through the system; and
(J) the toner particles have a circularity in the range of 0.940 to 0.999;
The toner particles contain wax domains having an aspect ratio in the range of 1.4 to 1.8, and the toner particles have a roundness in the range of 1.3 to 1.6 Recovering toner particles containing the domain from the system;
Including
A method for producing a toner composition.

The method for producing a toner composition according to claim 9, wherein the slurry of the aggregated particles is preheated to a temperature within a range from 60 ° C. to 70 ° C. 10.

The method for producing a toner composition according to claim 9, wherein the pH of the slurry is increased within a range of 4.45 to 5.50.

The method for producing a toner composition according to claim 9, wherein the pH of the slurry of fused toner particles is raised within a range of 8.7 to 8.9.

The method for producing a toner composition according to claim 9, wherein the stop of the aggregation of the particles is performed by adding an NaOH solution.