| 摘要 |
<p>This invention describes gelatin thickening compounds for photographic coating melts with the general structure: <CHEM> wherein: A is an aromatic or heteroaromatic group; X is SO3M or CO2M M is H or an alkali metal, ammonium or pyridinium ion; each R1 and R2 is independently an alkyl or substituted alkyl group, each alkyl group being straight or branched chain and having 1 to 30 carbon atoms; each R3 and R4 is independently H or an alkyl or substituted alkyl group, each alkyl group being straight or branched chain and having 1 to 30 carbon atoms; each of a, b, c and e is independently 0, 1, 2 or 3; and d is 1, 2, or 3; with the proviso that when A is phenyl, X is SO3M, d is 1 and any one of a, c, or e is 1, the sum of a + b + c + e is at least 2.</p> |
