| 摘要 |
1,201,194. Photographic reversal process and physical development. HONEYWELL Inc. June 29, 1967 [June 29, 1966], No.27086/67. Heading G2C. [Also in Division C7] A substrate of e.g. polyethylene terephthalate, cellulose acetate, p.v.c., polyvinylacetate, polyvinylidene chloride, polyacrylonitrile, paper or cloth, is first coated with a water-permeable gel of e.g. polyvinyl alcohol, vinyl chloride, vinyl acetate, cellulose or gelatine and then with a photo-sensitive layer of a silver compound which is then imagewise exposed, developed, and fixed. The substrate is sensitized with e.g. stannous chloride or a titanium compound, activated with palladium chloride, and then electroless plated with e.g. Ni, Co and alloys thereof, which may include Fe, P or S. Plating occurs in the unexposed areas i.e. those free from metallic silver. Alternatively the photo-sensitive layer is exposed, developed, and the silver image bleached out. The originally unexposed areas are then exposed and developed. Electroless plating then deposits metal on the originally exposed areas. The sensitizing solution may contain stannic ions. The activating and sensitizing materials may be applied together as a colloidal dispersion. The electroless bath may comprise (g/l) 50 COCl 2 . 6H 2 O, 30NiCl 2 . 6H 2 O, 40NaH 2 PO 2 , 50 Rochelle salt, 25NH 4 Cl, and 40 citric acid (temperature 60 to 95‹C., pH7À2 to 10À0). |
