Abstract: A toner has at least 100 parts by weight of binder resin and 0.1 to 15 parts by weight of colorant. The toner has a number average particle size (Dn) of 0.5 to 6.0 .mu.m, a particle size distribution coefficient (volume average particle size (Dv) / number average particle size (Dn)) of 1.0 to 1.3 and a variation coefficient of particle number distribution of 20% or less.The toner contains 0.1 to 5.0% by weight of methanol-soluble resin component extracted by the first Soxhlet extraction with methanol and 50 to 99% by weight of THF-soluble resin component extracted by a second Soxhlet extraction with tetrahydrofuran (THF) after the Soxhlet extraction with methanol, wherein the maximum glass transition point (Tg.sub.2) of the methanol-soluble resin component and the glass transition point (Tg.sub.1) of the THF-soluble resin component satisfies the following relation;0 (.degree. C.)<Tg.sub.2 -Tg.sub.1 .ltoreq.150 (.degree. C.)and50 (.degree. C.).ltoreq.Tg.sub.1.

Abstract: A magnetic coated carrier suitable for constituting a two-component type developer for use in electrophotography is composed of magnetic coated carrier particles comprising magnetic carrier core particles and a resinous surface coated layer coating the magnetic carrier core particles. The carrier is suitably constituted so as to satisfy the condition of: (a) the magnetic carrier core particles has a resistivity of at least 1.times.10.sup.10 ohm.cm, and the magnetic coated carrier has a resistivity of at least 1.times.10.sup.12 ohm.cm, (b) the magnetic coated carrier has a number-average particle size of 1-100 .mu.m and has such a particle size distribution that particles having particle sizes of at most a half of the number-average particle size occupy an accumulative percentage of at most 20% by number, (c) the magnetic coated carrier has a shape factor SF-1 of 100-130, (d) the magnetic coated carrier has a magnetization at 1 kilo-oersted of 40-250 emu/cm.sup.

Abstract: A toner for electrophotography contains at least a colorant and a binder resin, and (i) contains 0.1 to 15 parts by weight of colorant per 100 parts by weight of binder resin, (ii) has a number average particle size of 0.5 to 6.0 .mu.m, (iii) has a coefficient of variation of 20% or less based on a number distribution, and (iv) has a capsule structure containing a shell layer and a core. The toner has solvent-mixture-soluble resin components extracted with a solvent mixture of ethanol and methyl ethyl ketone wherein the maximum glass transition temperature (Tg1) of a first soluble resin component obtained by extracting until 10% by weight of the total weight of the solvent-mixture-soluble resin components, and the maximum glass transition temperature (Tg2) of a second soluble resin component of the remainder satisfy the following relations:Tg1>Tg2 and Tg1.gtoreq.50.degree. C.

Abstract: A two component-type developer for electrophotography showing improved electrophotographic performances and also free from carrier adhesion (undesirable carrier transfer to the photosensitive member and recording materials) is constituted by using a magnetic carrier of 5-100 .mu.m in particle size. The carrier has a bulk density of at most 30 g/cm.sup.3, and magnetic properties including: a magnetization of 30-150 emu/cm.sup.3 under a magnetic field strength of 1000 oersted, a magnetization (residual magnetization .sigma..sub.r) of at least 25 emu/cm.sup.3 under a magnetic field strength of zero oersted, a coercive force of less than 300 oersted, and a relationship of:.vertline..sigma..sub.1000 -.sigma..sub.300 .vertline./.sigma..sub.1000 .ltoreq.0.40wherein .sigma..sub.1000 and .sigma..sub.300 denote magnetizations under magnetic field strength of 1000 oersted and 300 oersted, respectively.

Abstract: A carrier for use in electrophotography has carrier particles. The carrier particles each comprise a carrier core particle and a resin for coating the carrier core particle and having a resistivity of 10.sup.10 .OMEGA..multidot.cm or above under conditions of a temperature of 23.degree. C. and a humidity of 50% RH. The carrier particles have an average particle diameter of not larger than 100 .mu.m and a resistivity of 10.sup.10 .OMEGA..multidot.cm or above. The carrier particles comprise not less than 80% by number of resin-coated carrier particles whose carrier core particles are each coated with a resin in a coverage of not less than 90%.

Abstract: A two component-type developer for electrophotography showing improved electrophotographic performances and also free from carrier adhesion (undesirable carrier transfer to the photosensitive member and recording materials) is constituted by using a magnetic carrier comprising a soft magnetic material of 5-100 .mu.m in particle size. The carrier has a bulk density of at most 3.0 g/cm.sup.3, and magnetic properties including: a magnetization of 30-150 emu/cm.sup.3 under a magnetic field strength of 1000 oersted, and relationships (1) and (2):.vertline..sigma..sub.1000 -.sigma..sub.300 .vertline./.sigma..sub.1000 .ltoreq.0.40 (1)wherein .sigma..sub.1000 and .sigma..sub.300 denote magnetizations (emu/cm.sup.3) under magnetic field strengths of 1000 oersted (Oe) and 300 oersted (Oe), respectively, and0.15 (emu/cm.sup.3 .multidot.Oe).ltoreq..vertline..sigma..sub.100 -.sub.r .vertline./100 (Oe) (2),wherein .sigma..sub.100 and .sigma..sub.r denote magnetizations (emu/cm.sup.

Abstract: A two component-type developer for electrophotography showing improved electrophotographic performances and also free from carrier adhesion (undesirable carrier transfer to the photosensitive member and recording materials) is constituted by using a magnetic carrier comprising a soft magnetic material of 5-100 .mu.m in particle size. The carrier has a bulk density of at most 3.0 g/cm.sup.3, and magnetic properties including: a magnetization of 30-150 emu/cm.sup.3 under a magnetic field strength of 1000 oersted, and relationships (1) and (2):.vertline..sigma..sub.1000 -.sigma..sub.300 .vertline./.sigma..sub.1000 .ltoreq.0.40 (1)wherein .sigma..sub.1000 and .sigma..sub.300 denote magnetizations (emu/cm.sup.3) under magnetic field strengths of 1000 oersted (Oe) and 300 oersted (Oe), respectively, and0.15 (emu/cm.sup.3.Oe).ltoreq..vertline..sigma..sub.100 -.sigma..sub.r .vertline./100 (Oe) (2)wherein .sigma..sub.100 and .sigma..sub.r denote magnetizations (emu/cm.sup.