Imageable elements with low ph developer solubility
An imaging element and developer technology, which is applied in photography, the application of radioactive source radiation, and the photoplate-making process of patterned surfaces, etc., can solve the problems of insufficient solubility of polymer base materials, accumulation of residues, and reduced service life of developers, etc. question
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[0185] Fabrication of Multilayer Imageable Elements
[0186] The inner layer formulation can be applied sequentially over the surface of the hydrophilic substrate (and any other hydrophilic layer provided thereon) and then over the inner layer using conventional coating or lamination methods. The overcoat formulation is applied to produce a multilayer imageable element. It is important to avoid mixing of inner and outer layer formulations.
[0187] For example, a multi-layer imageable element can have an inner layer comprising a first polymeric binder and a radiation absorbing compound, and
[0188] Preparation of an ink-receptive outer layer comprising a second polymeric binder that: (1) is different from the first polymeric binder, and (2) is soluble in an alkaline developer when exposed to imaging radiation , and (3) is poly(vinylphenol) or a derivative thereof, or a phenolic polymer comprising repeating units represented by structure (I).
[0189] The inner and outer la...
Embodiment 1-6
[0251] The multilayer imageable elements of the present invention were prepared as follows:
[0252] By dissolving copolymer A (5.0 g) and IR dye A (0.7 g) in a 90 ml solvent mixture comprising MEK (45 wt%), PMA (35 wt %), BLO (10 wt %) and water (10 wt %), it was Coated on Substrate A and dried at 135°C for 45 seconds to provide 1.35g / m 2 Inner Layer Formulation 1 was prepared with a dry coat weight of .
[0253] Copolymer B was coated on substrate A by dissolving it in 90 ml of solvent mixture comprising MEK (45 wt%), PMA (35 wt%), BLO (10 wt%) and water (10 wt%) and dried at 135 °C 45 seconds, providing 1.35g / m 2 Inner Layer Formulation 2 was prepared with a dry coat weight of .
[0254] By dissolving 2.38 g of the main polymer base shown in Table II below in 40 g of solvent mixture (DEK:PMA, 9:1 weight ratio), 307 (0.03g) and ethyl violet (0.032g), coated on top of the dried inner layer as described in Table II, and dried at 135°C for 45 seconds to provide 0.55-65g / m ...
Embodiment 7-8
[0271] A single layer imageable element of the present invention was prepared analogously to Comparative Example 2 above. The only difference is that the polymer binder used in the imageable layer is the primary polymer binder as shown in Table III below.
[0272]
[0273] The solubility of the polymer base in 956 developer was tested by dissolving 0.30 g of the polymer base in 30 ml of developer while stirring.
[0274] The imageable elements were evaluated in the following manner:
[0275] Solvent Resistance: Immerse the elements in solvent petroleum / isopropanol 90% / 10% and wipe with a pad every 30 seconds up to 4 minutes. The components are then removed and rinsed with water. Observe the time to first visible solvent attack.
[0276] Developer Resistance: A drop of developer was applied to the unimaged element every 30 seconds for up to 2 minutes while keeping the element and developer at 25°C. The elements were then rinsed with water and dried, at which time the opt...
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