3,3-DI-(Substituted azaphenanthen-8-yl)phthalides and naphthalides
    8.
    发明授权
    3,3-DI-(Substituted azaphenanthen-8-yl)phthalides and naphthalides 失效
    3,3-DI-(取代的azaphenanthen-8-基)苯酞和萘

    公开(公告)号:US3920667A

    公开(公告)日:1975-11-18

    申请号:US39819573

    申请日:1973-09-17

    Applicant: POLAROID CORP

    Inventor: IDELSON ELBERT M

    CPC classification number: G03C8/48

    Abstract: This invention relates to a class of phthalein indicator dyes useful as optical filter agents in photographic processes to protect a selectively exposed photosensitive material from further exposure during processing in the presence of indicident light. Such dyes comprise 3,3-disubstituted phthalides and 3,3disubstituted naphthalides wherein the 3,3 substituents are parahydroxy polycyclic aryl radicals possessing a nitrogen atom included in the ring system adjacent to the para-hydroxy group.

    Abstract translation: 本发明涉及一种在摄影过程中可用作光学滤光剂的酞类指示剂染料,以在存在指示光的过程中保护选择性曝光的感光材料免于进一步曝光。 这样的染料包括3,3-二取代的苯并二苯并呋喃和3,3-二取代的萘,其中3,3个取代基是具有邻近对羟基的环系中包含的氮原子的对羟基多环芳基。

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