# US 10,768,541 B2 · Toner for developing electrostatic images

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- Number: US 10,768,541 B2
- Document ID: US10768541B2
- Status: Granted
- Kind: B2
- Application number: 16/552,399
- Filed: 2019-08-27
- Published: 2020-03-12
- Granted: 2020-09-08
- Earliest claimed: 2018-09-07
- Assignees: Konica Minolta, Inc.
- Applicants: Konica Minolta, Inc.
- Inventors: Miyuki Yamada; Takanari Kayamori
- Web page: https://patentgrep.com/patent/US10768541B2

## CPC

- G03G 9/0918: {Phthalocyanine dyes}
- G03G 9/0819: {characterised by the dimensions of the particles}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

A toner for developing electrostatic images includes at least a binder resin and a colorant containing a copper phthalocyanine compound, wherein in X-ray diffraction using a CuKα ray, the toner has peaks at a Bragg angle of 2θ=7.0±0.1° and at a Bragg angle of 2θ=9.1±0.2° and additionally has a peak between the two peaks.

## Claims

### Claim 1

A toner for developing electrostatic images comprising at least a binder resin and a colorant containing a copper phthalocyanine compound, wherein
in X-ray diffraction using a CuKα ray, the toner has peaks at a Bragg angle of 2θ=7.0±0.1° and at a Bragg angle of 2θ=9.1±0.2° and
additionally has a peak between the two peaks.

### Claim 2 (depends on 1)

The toner for developing electrostatic images according to claim 1, wherein a value of a ratio of a number average long diameter Db to a number average short diameter Da of primary particles of the copper phthalocyanine compound (Db/Da) is within a range of 3.0 to 6.0.

### Claim 3 (depends on 1)

The toner for developing electrostatic images according to claim 1, wherein the copper phthalocyanine compound is an unsubstituted copper phthalocyanine compound.