Abstract: Dry toner particles are provided wherein the toner resin includes a mixture of two polymer A and B, A and B being chosen such that an extruded slab with thickness 250 &mgr;m of a 50:50 mixture of both has a transmission density (DM) being between 0.10 and 1.00 higher than the sum of half the transmission density of a 250 &mgr;m extruded slab of polymer A alone (DA) and half the transmission density of a 250 &mgr;m extruded slab of polymer B alone (DB). The polymers A and B are mixed in a weight ratio between 5:1 to 1:5 and make up at least 25% by weight of the total toner resin. The polymer A is a polyester and the polymer B is a polyester or a specified styrene-acrylic copolymer.

Abstract: A dry toner powder the toner particles of which are triboelectrically positively charged and are suited for development of an electrostatic charge pattern, wherein said toner particles contain:(1) one or more triboelectrically positively chargeable thermoplastic resins serving as binder having a volume resistivity of at least 10.sup.13 .OMEGA.-cm, and(2) at least one substance having a volume resistivity lower than the volume resistivity of said binder, andwherein said substance(s) (2) when present in said binder in a concentration of 5% by weight lower(s) thereof the volume resistivity of said binder by a factor of at least 3.3, and wherein said toner powder containing particles including a mixture of said ingredients (1) and (2) under triboelectric charging conditions is capable of obtaining an absolute median (q/d) charge/diameter value (x) lower than 10 fC/10 .mu.m but not lower than 1 fC/10 .mu.

Abstract: A dry powder toner of which the particles are electrostatically or magnetically attractable and suited for development of electrostatic charge images or magnetic patterns and wherein the composition of said powder particles includes a resin binder comprising at least one resin A and at least one resin B, characterized in that:(1) said resin(s) A and said resin(s) B each have a glass transition temperature (Tg) larger than 45.degree. C.,(2) the Tg of said resin(s) A is at least 2.5.degree. C. lower than the Tg of said resin(s) B,(3) the melt viscosity (mvA) of said resin(s) A is at least 500 poise and the melt viscosity (mvB) of said resin(s) B is within the scope of the following equation:(mvB)=F.times.(mvA),wherein F is an integer from 2 to 20, and with a maximum value of (mvB) not exceeding 15000 poise, and(4) the weight ratio of resin(s) A and resin(s) B in said powder particles is such that the deformability of the powder material as defined by test H herein is smaller than 15%.

Abstract: A dry powder toner of which the particles are electrostatically or magnetically attractable and suited for development of electrostatic charge images or magnetic patterns and wherein the composition of said powder particles includes a resin binder comprising at least one resin A and at least one resin B, characterized in that:(1) said resin(s) A and said resin(s) B each have a glass transition temperature (Tg) larger than 45.degree. C.,(2) the Tg of said resin(s) A is at least 2.5.degree. C. lower than the Tg of said resin(s) B,(3) the melt viscosity (mvA) of said resin(s) A is at least 500 poise and the melt viscosity (mvB) of said resin(s) B is within the scope of the following equation:(mvB)=F.times.(mvA),wherein F is an integer from 2 to 20, and with a maximum value of (mvB) not exceeding 15000 poise, and(4) the weight ratio of resin(s) A and resin(s) B in said powder particles is such that the deformability of the powder material as defined by test H herein is smaller than 15%.

Abstract: Particulate toner material for use in the development of latent electrostatic images, wherein said particulate toner material is capable of acquiring by triboelectric contact electrification a net negative charge and contains thermoplastic resin(s) as binder in combination with a colorant and a compound capable of imparting a negative charge to the particulate toner material in contact electrification, wherein the latter compound is an anthranilic acid derivative comprising a sulfonamido-group.

Abstract: A method of directly forming a light scattering image, wherein a recording layer is information-wise exposed in the visible light spectral region to a light energy dose of at least 10.sup.-1 Ws cm.sup.-2 with a focussed laser-beam having a beam intensity of at least 10.sup.4 W cm.sup.-2. The recording layer is a thermoplastic polymer layer having dissolved therein at least one substance absorbing visible light, which substance imparts a specular density to the recording layer of at least 0.1 with respect to a monochromatic wave of the laser-beam applied in the exposure and is present in an amount of maximum 10% by weight with respect to the thermoplastic polymer of the layer, the recording layer being capable of directly developing in the areas struck by said beam, minute light-scattering centers providing a minimum increase of white light specular density of 0.