发明名称 |
PHOTOGRAPHIC SYSTEM UTILIZING A COMPOUND CAPABLE OF PROVIDING CONTROLLED RELEASE OF A PHOTOGRAPHICALLY USEFUL GROUP |
摘要 |
<p>PHOTOGRAPHIC SYSTEM There is described a photographic system wherein development of an exposed photosensitive element with an aqueous alkaline photographic developing composition is effected in the presence of a compound represented by the formula wherein R is -OH, -OR4, -NH2 -NHR5 or -NR4R6; R1 is hydrogen, -NH2, alkyl, substituted alkyl, aryl or substituted aryl; R2 and R3 each independently is hydrogen, alkyl, aralkyl or aryl; R4 is a protecting group which can be removed in the presence of a base; R5 is an activating group which can render the neighboring hydrogen atom acidic; R6 is an electron withdrawing group which is capable of stabilizing the negative charge on the nitrogen atom which is produced upon removal of R4 upon contact with alkali; and PHOTO is a photographically useful group. The compounds provide controlled release of the photographically useful group by a base-catalyzed elimination when contacted by the aqueous alkaline processing composition.</p> |
申请公布号 |
CA1325428(C) |
申请公布日期 |
1993.12.21 |
申请号 |
CA19870531693 |
申请日期 |
1987.03.11 |
申请人 |
POLAROID CORPORATION |
发明人 |
BOGGS, ROGER A.;MAHONEY, JOHN B.;MEHTA, AVINASH C.;SCHWARZEL, WILLIAM C.;TAYLOR, LLOYD D. |
分类号 |
G03C8/08;C07D257/04;G03C7/305;G03C8/00;(IPC1-7):C07D257/04 |
主分类号 |
G03C8/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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