POSITIVE MATERIAL FOR SINGLE-STEP DIFFUSION PROCESS Russian patent published in 2006 - IPC G03C8/00 G03C8/52 

FIELD: chemical and photographic industry.

SUBSTANCE: positive material has substrate, primer layer made of composition which has methyl-metacrylate latex (3-12 mass %), thiocarbamide (0,04-0,2 mass %), glass on the base of potassium meta-silicate (0,4-6,0 mass %), semi-water carbon nickel carbon (0,15-0,55 mass %), complex former on the base of tri-potassium or tri-sodium nitrile tri-acetic acid (0,3-0,7 mass %), damper (0,02-0,6 mass %), water (the rest) and polymer layer applied onto substrate coveter with primer. Polymer layer is made of composition which has polyvinylbutyral (0,9-6,0 mass %), metacrylate-metacrylate acid copolymer (0,1-3,6 mass%), heavy metal salt (0,001-0,9 mass %), and organic solvent (the rest). Method provides improvement in tone of image and ability of getting dry glaze flat photo without necessity of stabilization of image by vinegar.

EFFECT: stability of properties; simplified process of manufacture.

2 cl