Process for preparing stable dispersions useful in transparent coatings
AssigneeRexham Graphics Inc.
InventorBoris J. Katsen
Life of this patent
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Abstract
Provided is a process for preparing a stable dispersion. The dispersion is comprised of a pigment, such as cuprous iodide, dispersed in a binder resin solution. The process is comprised of first dispersing the pigment into a binder resin solution, grinding the dispersion, preferably until a bi-modal distribution of pigment particles is obtained, separating the dispersed particles into two fractions and then recovering the fraction having the smaller average particle size. The resulting dispersion has been found to be quite stable and useful in transparent coatings applicable to electrophotography, electrostatic and thermal imaging elements.
Claims11
A dispersion prepared by the process of
- (i) dispersing a pigment into a binder resin solution;
- (ii) comminuting the dispersion until a bi-modal distribution of pigment particles is obtained;
- and
- (iii) separating the dispersed particles into two fractions of dispersed particles including a stable dispersion of smaller particles in a binder resin solution.
A process for preparing a ground plane, which comprises
- (i) providing a support;
- (ii) coating onto the support a stable dispersion of conductive particles in a binder resin solution prepared by the process of
- (iii) dispersing a pigment into a binder resin solution;
- (iv) comminuting the dispersion until a bi-modal distribution of pigment particles is obtained;
- (v) separating the dispersed particles into two fractions of dispersed particles including a stable dispersion of smaller particles in a binder resin solution;
- and
- (vi) drying the coating to thereby form a conductive layer on the support.
A process for preparing a transparent thermal imaging material, which comprises coating a support with a dispersion prepared by the process of
- (i) dispersing a pigment into a binder resin solution;
- (ii) comminuting the dispersion until a bi-modal distribution of pigment particles is obtained;
- and
- (iii) separating the dispersed particles into two fractions of dispersed particles, and then drying the coating to thereby form a non-conductive, transparent layer on the support.
A dispersion prepared by the process of
- (i) dispersing a pigment into a binder resin solution;
- (ii) comminuting the dispersion in an impingement mill until a bi-modal distribution of pigment particles is obtained;
- and
- (iii) separating the dispersed particles into two fractions of dispersed particles including a stable dispersion of smaller particles in a binder resin solution.
Dependencies are inferred from the claim text.