| 摘要 |
<p>949,643. Photographic developers. GEVAERT PHOTO-PRODUCTEN N. V. Nov. 2, 1961 [Nov. 4, 1960(2)], No. 39228/61. Heading G2C. Photographic silver halide developers contain the reaction product of a polyalkylene oxide with an aldehyde, a dicarboxylic acid or anhydride, or a di-iso cyanate. The reaction products are those described in Specification 920, 637 for use in the silver halide material. Examples are given of developers containing compounds obtained by reacting polyethylene glycol with maleic anhydride or sebacic acid. The developers may contain hydroquinone, with or without metal and a formaldehyde/bisulphite addition product.</p> |
