| 摘要 |
894,590. Photographic films. AGFA A.G. July 8, 1959 [July 9, 1958], No. 23493/59. Class 98(2). A hydrophobic film support for a silver halide emulsion layer is subbed with the reaction product of a compound having at least two 2;3-epoxypropyl groups and a mixed acetal of a vinyl alcohol polymer with an aldehyde containing as water - solubilizing group a hydroxy, carboxy or sulphonic acid group or a salt of such acid groups, and an aldehyde devoid of said water-solubilizing groups. The vinyl alcohol polymer may be obtained by partial hydrolysis of a polyvinyl ester or by partial or complete hydrolysis of a copolymer of a vinyl ester with vinyl chloride or ethylene. The aldehyde containing a watersolubilizing group may be benzaldehyde-2- sulphonic acid, benzaldehyde-2;4-disulphonic acid or 2- or 4-hydroxy-benzaldehyde. The aldehyde devoid of water-solubilizing groups may be benzaldehyde, 2- or 4-tolyl aldehyde or 2- or 4-chlorobenzaldehyde. The epoxy compound may be glycol diglycidyl ether, butane-1,4-diol diglycidyl ether, glycerol triglycidyl ether, 1,1,1-trimethylol-propane triglycidyl ether, pentaerythritol tetraglycidyl ether, resorcinol diglycidyl ether, glycerol diglycidyl ether, the diglycidyl ethers of diphenylol-propane or diphenylol-methane, mono- or polyamines such as methyl-, ethyl-, propyl-, butyl- or hexyl-amines in which the two H atoms on each nitrogen are replaced by 2;3-epoxypropyl groups; ethylene-, propylene- or hexamethylene-diamine in which the two H atoms of each amino group are replaced by 2;3-epoxypropyl groups, aromatic amines such as aniline, 2- or 4-tolylamine, or 2- or 4-chlorophenylamine in which the two amino H atoms are replaced by 2;3-epoxypropyl groups, 4, 41-di(alkylamino)-diphenylmethane in which the H atom of each alkylamino group is replaced by a 2;3-epoxypropyl group, and polycarboxylic acids such as malonic, succinic, adipic, phthalic or terephthalic acids in which the H atoms of the acid groups are replaced by 2;3-epoxypropyl groups. The subbing layers also may contain film-forming polymeric compounds containing hydroxy groups. The subbing layer may be heated after coating to effect cross-linking. Specification 894,589 is referred to. |
