| 摘要 |
Crosslinkable polymers which can be purified by conventional purification techniques such as dialysis, diafiltration, ultrafiltration without losing their capability of crosslinking are prepared from monomers having the formula (I): ……CH2 = @ - @ - Z - @ - CH2 - R<1>… wherein R is hydrogen or methyl,… R<1> is cyano or -CO-R<2>,… wherein R<2> is alkyl having from 1 to 6 carbon atoms; …<CHEM>… wherein R<3> is a divalent hydrocarbon,… each X is -O- or NR<4>- provided that at least one X is -NR<4>-,… R<4> is hydrogen or alkyl having from 1 to 6 carbon atoms and… D<1> and D<2> represent the carbon and hydrogen atoms necessary to complete a 5- to 7- membered heterocyclic ring. …<??>The monomers can be homopolymerized or copolymerized with other monomers. The resulting purified polymers are particularly useful in photographic materials as gelatin extenders, binders or polymeric color couplers. |
