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Oxime Ester Photoinitiators Disclosure Number: IPCOM000026280D
Publication Date: 2004-Apr-05
Document File: 1 page(s) / 34K

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The Prior Art Database

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Gabriele Weidenbr├╝ck: CONTACT


Oxime ester compounds photoininitiators can be synthesized to have different crystal forms. Thus, alklylthio- or amino-substituted oxime esters can be obtained in either a low melting or high melting form. Both forms are effective as photoinitiators.

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Oxime Ester Photoinitiators

Oxime ester compounds are known to be effective photoininitiators.

In particular in electronic applications particularly characterized structures are employed, usually of the formula (I).

, wherein

R independently denotes an alkyl, alkoxy, alkythio, arylthio or alkylamino group; or via the group R a ring structure can be build up, in particular rings including the heteroatom of the alkoxy, alkythio, arylthio or alkylamino moiety. Said ring structure may also consist of more than one ring, e.g. comprising condensed phenyl rings etc. and said ring structure may be further substituted;

n is a number from 1 to 5;

R1 is hydrogen, alkyl or a phenyl group; and R2 denotes an alkyl or unsubstituted or substituted phenyl group.

As very effective initiators, in particular for color filter applications, even as initiator for the black matrix the following compounds are suggested:

, wherein R2 is defined as above and R3 and R4 independently of one another are alkyl or phenyl, which is optionally further substituted. R5 is alkyl and m is an integer from 0 to 5.

Particularly interesting are the following compounds (II), (III), .

The preparation of such compounds is for example disclosed in GB 2339571 or WO 02/100903

By using conventional crystallisation techniques in the preparation of said compounds, it is possible to prepare different crystal forms of the compounds, i.e. a lower melting form and a higher melting form, respectively.

For example compound (II) is...