Diazotype reproduction layer formed from matrix of spheric particle polystyrene pigment and diazotype components

Abstract

Plastic pigment spheric particles which form a matrix for diazotype reproduction materials are applied to a base sheet. Whether the diazo sensitizing solution is included in admixture with spheric plastic pigment particles or is applied thereafter as a second coating, a matrix is formed having a sensitized diazo layer dispersed throughout. Such diazo matrices permit control of contrast ratios over a wide range. Also such diazo matrices are transferable. The diazo matrix image can be made water fast by an after treatment by means of a solvent. Such a matrix lends itself to the heat development process by retaining the heat generated development agents within the matrix due to its thermoplastic character. In another aspect of the invention multi-color diazo reproduction on a single base sheet employing consecutive overcoatings of the matrix and diazo sensitizing solution after each development can be achieved.

Dependencies are inferred from the claim text.