Toner for electrostatic charge development
US8778588B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 2011 |
| Grant date | Jul 15, 2014 |
| Priority date | — |
| Expiry date | Jan 27, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/08797
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
To provide a toner, which contains a binder resin, a colorant, and a releasing agent, wherein the binder resin contains a low molecular weight resin component, where the low molecular weight resin component has a resin softening coefficient (A), represented by the following formula (1), satisfying A>0.165, and has storage elastic modulus (dyne/cm2) G′(Tfb) satisfying G′(Tfb)≦1×104 where Tfb is a flow onset temperature (° C.) of the low molecular weight resin component as measured by a capillary rheometer:A=|[(r1)−ln G′(r2)]/(T1−T2)| Formula (1)(where T1 is temperature (° C.) at which storage elastic modulus G′(r1) is 1×105 (dyne/cm2) and T2 is temperature (° C.) at which storage elastic modulus G′(r2) is 1×103 (dyne/cm2) as measured by means of a viscoelasticity measuring device with measuring frequency of 1 Hz, and measuring distortion of 1 deg; and | | represents an absolute value.).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.