Agfa Gevaert Nv

Xeikon N.v.

Jean-Pierre A Ghekiere

Serge M Tavernier

Werner J Op De Beeck

Jean-Marie O Dewanckele

Werner Op De Beeck

Michel Vervoort

Hugo K Peeters

Gustaaf Van Tendeloo

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 (D ) 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 (D ) and half the transmission density of a 250 &mgr;m extruded slab of polymer B alone (D ). 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.

Electrostatically and/or magnetically attractable toner powder

Positively charged toner for use in electrostatography

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:

Toner composition suited for fixing by non-contact fusing

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:

Method of fixing toner by non-contact fusing

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.

Particulate toner material containing charge controlling compound

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 0.2 when measured with respect to a transparent background and determined as described hereinbefore, but being incapable of developing such centers when exposed with the same laser-beam at an intensity reduced by a factor of 10.

Growing community of inventors

Lint, Belgium

Jean-Pierre A Ghekiere