The inventive label is prepared from a polyester with an intrinsic viscosity of 0.58 dl/g or more. The label has a base film with a thickness of 8-30 m and a difference in specific heat capacity Cp between temperatures lower and higher than Tg of 0.2 J/(g.Math. C.) or more. The label has a tensile elongation at break of 5% or more in both a main shrinkage direction and an orthogonal direction. A difference between the absorbancy ratio (absorbancy at 1340 cm.sup.1/absorbancy at 1410 cm.sup.1) in the main shrinkage direction of the label and the absorbancy ratio in the direction orthogonal to the main shrinkage direction of the label is 0.2 or more. The label has a difference between a maximum value and a minimum value of a length in a vertical direction of the label of 3 mm or less.

The inventive label is prepared from a polyester with an intrinsic viscosity of 0.58 dl/g or more. The label has a base film with a thickness of 8-30 m and a difference in specific heat capacity Cp between temperatures lower and higher than Tg of 0.2 J/(g.Math. C.) or more. The label has a tensile elongation at break of 5% or more in both a main shrinkage direction and an orthogonal direction. A difference between the absorbancy ratio (absorbancy at 1340 cm.sup.1/absorbancy at 1410 cm.sup.1) in the main shrinkage direction of the label and the absorbancy ratio in the direction orthogonal to the main shrinkage direction of the label is 0.2 or more. The label has a difference between a maximum value and a minimum value of a length in a vertical direction of the label of 3 mm or less.

A polyarylate resin is represented by general formula (1) shown below. In general formula (1), R.sup.1 represents a hydrogen atom or methyl group. R.sup.2 and R.sup.3 each represent a hydrogen atom or an alkyl group having a carbon number of at least 1 and no greater than 4. R.sup.2 and R.sup.3 are not the same as one another. When R.sup.1 represents a hydrogen atom, R.sup.2 and R.sup.3 are not bonded to one another. When R.sup.1 represents a methyl group, R.sup.2 and R.sup.3 are optionally bonded to one another to form a ring. r and s each represent a number greater than or equal to 0 and less than or equal to 49. t and u each represent a number greater than or equal to 1 and less than or equal to 50. r+s+t+u=100. r+t=s+u.

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A method of producing a toner including the steps of: mixing resin fine particles, an organic solvent, and a resin R with a dispersion medium containing carbon dioxide, to prepare a dispersion of resin R-containing droplets; and removing the organic solvent by flowing carbon dioxide, wherein the resin fine particles contain one or more resins that have a partial structure A, B, and C, and are soluble in chloroform; the SP value of the partial structure A, the resin R, and the partial structure B satisfy particular relationships; a resin A constituted of the partial structure A and a resin B constituted of the partial structure B are soluble in the organic solvent; and a resin C constituted of the partial structure C is insoluble in the organic solvent.

A method of producing a toner including the steps of: mixing resin fine particles, an organic solvent, and a resin R with a dispersion medium containing carbon dioxide, to prepare a dispersion of resin R-containing droplets; and removing the organic solvent by flowing carbon dioxide, wherein the resin fine particles contain one or more resins that have a partial structure A, B, and C, and are soluble in chloroform; the SP value of the partial structure A, the resin R, and the partial structure B satisfy particular relationships; a resin A constituted of the partial structure A and a resin B constituted of the partial structure B are soluble in the organic solvent; and a resin C constituted of the partial structure C is insoluble in the organic solvent.

A toner is provided. The toner contains a polyester resin. The toner has a glass transition temperature (Tg1st) at first temperature rising of differential scanning calorimetry (DSC) of from 45 C. to 65 C. The toner includes a component insoluble in tetrahydrofuran (THF) having two glass transition temperatures (Tga1st and Tgb1st) at the first temperature rising of DSC, where Tga1st is in a range of 45 C. to 5 C. and Tgb1st is in a range of 45 C. to 70 C. The toner includes a component soluble in THF having a glass transition temperature (Tg2nd) at second temperature rising of DSC of from 40 C. to 65 C.

A toner is provided. The toner contains a polyester resin. The toner has a glass transition temperature (Tg1st) at first temperature rising of differential scanning calorimetry (DSC) of from 45 C. to 65 C. The toner includes a component insoluble in tetrahydrofuran (THF) having two glass transition temperatures (Tga1st and Tgb1st) at the first temperature rising of DSC, where Tga1st is in a range of 45 C. to 5 C. and Tgb1st is in a range of 45 C. to 70 C. The toner includes a component soluble in THF having a glass transition temperature (Tg2nd) at second temperature rising of DSC of from 40 C. to 65 C.

A toner includes toner particles each including a pulverized toner mother particle and an external additive attached to the surface of the toner mother particle. The toner mother particles have a volume median diameter of at least 5.20 m and no greater than 6.50 m and contain a binder resin containing a tetrahydrofuran-insoluble component in a percentage content of at least 4.50% by mass and no greater than 16.00% by mass. The tetrahydrofuran-insoluble component has a percentage content of no greater than 2.20% by mass in the binder resin as subjected to ultrasonication at an output power of 200 W and a frequency of 28 kHz for 1 minute. In an infrared absorption spectrum of the toner particles plotted by infrared spectroscopy, a peak appearing at a wavenumber of 701 cm.sup.1 has a height of at least 0.0070 A and no greater than 0.0300 A.

A toner includes toner particles each including a pulverized toner mother particle and an external additive attached to the surface of the toner mother particle. The toner mother particles have a volume median diameter of at least 5.20 m and no greater than 6.50 m and contain a binder resin containing a tetrahydrofuran-insoluble component in a percentage content of at least 4.50% by mass and no greater than 16.00% by mass. The tetrahydrofuran-insoluble component has a percentage content of no greater than 2.20% by mass in the binder resin as subjected to ultrasonication at an output power of 200 W and a frequency of 28 kHz for 1 minute. In an infrared absorption spectrum of the toner particles plotted by infrared spectroscopy, a peak appearing at a wavenumber of 701 cm.sup.1 has a height of at least 0.0070 A and no greater than 0.0300 A.

An electrostatic charge image developing toner containing: toner particles; and silica particles having a compaction aggregation degree of from 60% to 95% and a particle compaction ratio of from 0.20 to 0.40, an electrostatic charge image developer containing the electrostatic charge image developing toner, and a toner cartridge that accommodates the electrostatic charge image developing toner and is detachable from an image forming apparatus.