JP2015191198A5

JP2015191198A5 -

Info

Publication number: JP2015191198A5
Application number: JP2014070170A
Authority: JP
Filing date: 2014-03-28
Publication date: 2017-04-13
Anticipated expiration: 2034-03-28

Claims

a) a step of mixing a binder resin and a solvent capable of dissolving the binder resin to prepare a resin solution;
b) mixing the resin solution with a dispersant and a dispersion medium containing carbon dioxide in a liquid state or supercritical state, and granulating the mixture to form droplets of the resin solution; and c) the liquid Removing the solvent contained in the droplets to obtain toner particles;
A method for producing a toner comprising:
The passing rate A of the binder resin obtained by the following [Evaluation technique 1] is 90.0% or more,
The solubility index B of carbon dioxide with respect to the solvent obtained by the following [Evaluation Method 2] is 40.0% by mass or less, and the dissolution index C of the solvent with respect to carbon dioxide obtained by the following [Evaluation Method 3]. Is 2.0% by mass or more and 20.0% by mass or less.
[Evaluation Method 1]
When the pre-ground binder resin is sieved, the mass of the evaluation binder resin is defined as a binder resin that passes through a sieve having an opening of 150 μm and does not pass through a sieve having an opening of 38 μm. Is W1 (g).
Next, after the binder resin for evaluation was mixed with carbon dioxide having a temperature of 25 ° C. and a pressure of 6.5 MPa for 2 hours, it was passed through a sieve having an opening of 150 μm again, and the mass of the binder resin passed through was determined as W2 (g). To do.
From the values of W1 and W2, the passage rate A is obtained by the following equation (1).
Passing rate A (%) = W2 / W1 × 100 (1)
[Evaluation Method 2]
V1 (g) of the solvent is put into the sealed container. Next, carbon dioxide is introduced while being pressurized from atmospheric pressure at a temperature of 25 ° C. until saturation with respect to the solvent, and the amount of carbon dioxide introduced at this time is defined as V2 (g).
The content of carbon dioxide saturated in the solvent relative to the total amount of the solvent and carbon dioxide saturated in the solvent is defined as a penetration index B, and the penetration index B is obtained from the values of V1 and V2 by the following formula (2).
Penetration index B (mass%) = V2 / (V1 + V2) × 100 (2)
[Evaluation Method 3]
After the evaluation of the penetration index B in [Evaluation Method 2], carbon dioxide was further added at a temperature of 25 ° C.
The pressure is introduced to 6.5 MPa and phase separation is carried out into a solvent phase and a carbon dioxide phase, and the amount of carbon dioxide additionally introduced at this time is X1 (g).
Let X2 (g) be the mass of carbon dioxide transferred from the solvent phase to the carbon dioxide phase, and X3 (g) be the mass of solvent transferred to the carbon dioxide phase.
The solvent content in the carbon dioxide phase is taken as the dissolution index C, and the dissolution index C is determined from the values of X1, X2, and X3 by the following formula (3).
Melting index C (mass%) = X3 / (X1 + X2 + X3) × 100 (3)

The toner production method according to claim 1, wherein the penetration index B is 30.0 mass% or less.

The toner production method according to claim 1, wherein the melting index C is 2.0% by mass or more and 10.0% by mass or less.

The method for producing a toner according to claim 1, wherein the solvent has a melting point of 30 ° C. or lower and a boiling point of 250 ° C. or lower.

The solvent is at least one selected from the group consisting of benzyl alcohol, 2-phenylethanol, aniline, cinamyl alcohol, p-cresol, o-nitroanisole, N-ethylaniline, p-toluidine, and N-methylaniline. The method for producing a toner according to claim 1, wherein the toner is a toner.

Method for producing a toner according to any one of claims 1 to 5 containing a resin containing a site where the binder resin is capable of forming a crystal structure.

The resin containing a part capable of taking a crystal structure is a block polymer in which a part that can take a crystal structure and a part that cannot take a crystal structure are chemically bonded,
The method for producing a toner according to claim 6 , wherein the content of the portion capable of taking the crystal structure is 50.0% by mass or more and 90.0% by mass or less based on the binder resin.