Radiation imagery chemistry: process – composition – or product th – Diazo reproduction – process – composition – or product – Diazo-type process – i.e. – producing dye image by reacting...
Patent
1975-09-03
1981-06-23
Bowers, Jr., Charles L.
Radiation imagery chemistry: process, composition, or product th
Diazo reproduction, process, composition, or product
Diazo-type process, i.e., producing dye image by reacting...
430160, 430176, 430177, G03C 160, G03C 187, G03C 534
Patent
active
042751373
ABSTRACT:
Diazotype material having a thin light-sensitive layer that is developable excellently by a limited application (1.5 to 4.5 cm.sup.3 /m.sup.2) of a buffered aqueous solution of an azo component, and which adheres well to the support even in moist condition, can be obtained by providing on a paper support a light-sensitive layer containing a binder and filler with at least one diazo compound, when the binder comprises a condensation product of an amino compound with formaldehyde, e.g. cross-linked hexamethoxymethyl-melamine, and a hydrophilic polymer crosslinkable with said product, e.g. highly hydrolyzed polyvinyl alcohol, and the filler comprises starch particles, e.g. rice starch powder, in a weight proportion to said polymer of at least 5 to 1, and even as high as 30-70 to 1. A water-sealing layer on both sides of the support, or only on a side beneath the light-sensitive layer, renders the material curl resistant.
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Bowers Jr. Charles L.
Johnston Albert C.
Oce'-van der Grinten N.V.
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