Processes and compositions for photogeneration of acid
First Claim
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1. An acid-generating medium comprising:
- a diaryl iodonium salt; and
a squarylium dye capable of absorbing infra-red radiation having a wavelength within the range of 700 to 1200 nm, the dye having a squarylium ring the 1- and 3-positions of which are each connected, via a single sp2 carbon atom, to a pyrylium, thiopyrylium, benzpyrylium or benzthiopyrylium moiety, at least one of the sp2 carbon atoms having a hydrogen atom attached thereto, and the 2-position of the squarylium ring bearing an O-, amino or substituted amino, or sulfonamido group.
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Abstract
An infra-red sensitive acid-generating medium comprises a binder, an iodonium salt; and a squarylium dye capable of absorbing infra-red radiation having a wavelength within the range of about 700 to about 1200 nm, the dye having a squarylium ring the 1- and 3-positions of which are each connected, via a single sp2 carbon atom, to a pyrylium, thiopyrylium, benzpyrylium or benzthiopyrylium nucleus, at least one of the sp2 carbon atoms having a hydrogen atom attached thereto, and the 2-position of the squarylium ring bearing an O-, amino or substituted amino, or sulfonamido group.
109 Citations
24 Claims
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1. An acid-generating medium comprising:
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a diaryl iodonium salt; and a squarylium dye capable of absorbing infra-red radiation having a wavelength within the range of 700 to 1200 nm, the dye having a squarylium ring the 1- and 3-positions of which are each connected, via a single sp2 carbon atom, to a pyrylium, thiopyrylium, benzpyrylium or benzthiopyrylium moiety, at least one of the sp2 carbon atoms having a hydrogen atom attached thereto, and the 2-position of the squarylium ring bearing an O-, amino or substituted amino, or sulfonamido group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A process for generating acid, which process comprises:
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providing a mixture of a diaryl iodonium salt and a squarylium dye capable of absorbing infra-red radiation having a wavelength within the range of 700 to 1200 nm, the dye having a squarylium ring the 1- and 3-positions of which are each connected, via a single sp2 carbon atom, to a pyrylium, thiopyrylium, benzpyrylium or benzthiopyrylium moiety, at least one of the sp2 carbon atoms having a hydrogen atom attached thereto, and the 2-position of the squarylium ring bearing an O-, amino or substituted amino, or sulfonamido group; and irradiating the mixture with infra-red radiation having a wavelength within the range of 700 to 1200 nm, thereby causing absorption of the radiation by the squarylium dye and formation of acid in the mixture. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification