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Negative-working imageable materials

a technology of imageable elements and negative working, applied in the field of negative working imageable elements, can solve the problems of difficult preparation of such polymers, and achieve the effect of better attachmen

Inactive Publication Date: 2008-02-21
EASTMAN KODAK CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an imageable element comprising a substrate and an imageable layer that includes a free radically polymerizable component, an initiator composition, and a polymeric binder. The use of a specific polymeric binder and initiator composition results in improved solvent resistance without a loss of imaging speed. The polymeric binder can be prepared using a unique synthetic method that avoids the problem of gelation or crosslinking. The technical effects of this invention include improved printing durability and higher efficiency in imaging and development.

Problems solved by technology

This problem may be solved using unique polymeric binders having multiple functional groups, such as pendant allyl and cyano groups, but it has been difficult to prepare such polymers without undesirable crosslinking (gelation).

Method used

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Examples

Experimental program
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Effect test

example 1

Solvent Resistance Test for Various Polymer Binders

[0161] This example demonstrates the chemical (solvent) resistance of the polymeric binders prepared according to the present invention compared to polymeric binders outside of the present invention.

[0162] Method 1:

[0163] Polymer A, B, C and Polymer 1 identified above (1 g of each) were individually stirred into 20 g of an 80 weight % solution of 2-butoxyethanol in water for 16 hours at 25° C. The resulting mixtures were filtered and the collected solids were washed with water and dried at 40° C. for 8 hours. The recovered polymer solids were weighed and found to be 0.88 g, 0.79 g, 0.82 g, and 0 g for Polymers A, B, C, and Polymer 1, respectively. Thus, the solubility (mg / g of 80 weight % 2-butoxyethanol solution) of the polymers was determined as described in the following TABLE I:

TABLE IPolymer APolymer BPolymer CPolymer 16.010.59.0>50.0

[0164] Method 2:

[0165] Polymers A, B, C and Polymer 1 identified above were individually ...

example 2

Single-Layer Negative-Working Imageable Elements & Plates

[0167] An imageable layer coating formulation was prepared by dissolving Polymer A (1.05 g), Oligomer A (0.73 g), SR-399 (0.56 g), Initiator A (0.19 g), IR Dye 1 (0.083 g), Irganox® 1035 (0.44 g, 5% in MEK), Pigment 951 (0.30 g), PEGDA (0.24 g), Phosmer PE (0.033 g), and a 10% Byk® 307 solution (0.28 g) in PGME (30.2 g) and MEK (15.9 g).

[0168] This formulation was coated onto an electrochemically-grained and sulfuric acid anodized aluminum substrate that had been post-treated with sodium hexafluorophosphate (PF) to provide a dry coating weight of about 1.3 g / m2 when dried at 170° F. (77° C.) for about 2 minutes on a rotating drum. Samples of the resulting imageable element were then imagewise exposed to a 830 nm IR laser at 4.5 Watts power and varying drum speed (250-60 rpm) on a CREO® Trendsetter 3244x image setter, and was developed in an NE 34 processor (Eastman Kodak Company) containing 956 Developer at 25° C. The minimu...

example 3

Negative-Working Imageable Element with Topcoat

[0170] An imageable element was prepared according to Example 2. The imageable layer was overcoated with a solution containing 9.7% Airvol 203 (162.8 g, polyvinyl alcohol) in water, 20% polyvinyl imidazole (13.9 g) in water, 2-propanol (11.8 g), and water (111.4 g). After applying the overcoat formulation in a similar manner as the imageable layer formulation, the resulting imageable element was dried at 170° F. (77° C.) for about 1 minute on a rotating drum to yield a dry coating weight of overcoat of about 0.5 g / m2.

[0171] The imageable element was then exposed to an 830 nm IR laser at 2.5 W power and varying drum speed (250-60 RPM) on a CREO Trendsetter 3244x imagesetter and was developed in an NE 34 processor containing with 956 Developer at 25° C. The minimum energy needed to achieve a stable solid density and clean background was about 50 mJ / cm2. Samples of the same element were incubated 48° C. for 5 days, imaged, and developed,...

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Abstract

A negative-working imageable element includes a combination of a specific polymeric binder comprising pendant allyl ester groups with an highly efficient iodonium borate free radical initiator to provide solvent resistance, excellent digital imaging speed (sensitivity) and can be imaged and developed without a preheat step to provide lithographic printing plates. The polymeric binder can be prepared with a precursor polymer having pendant carboxy groups that are converted to allyl ester groups using an allyl-containing halide in the presence of a base in order to avoid gelation. The desired iodonium borates are diaryliodonium borates having substituents on the aryl rings.

Description

RELATED APPLICATION [0001] This is a Continuation-in-part of U.S. Ser. No. 11 / 494,235 filed Jul. 27, 2006 by Ting and Beckley, which has been allowed.FIELD OF THE INVENTION [0002] This invention relates to negative-working imageable elements such as negative-working printing lithographic printing plate precursors that have increased solvent resistance and good sensitivity. The invention also relates to methods of using these imageable elements. BACKGROUND OF THE INVENTION [0003] Radiation-sensitive compositions are routinely used in the preparation of imageable materials including lithographic printing plate precursors. Such compositions generally include a radiation-sensitive component, a radically polymerizable component, an initiator system, and a binder, each of which has been the focus of research to provide various improvements in physical properties, imaging performance, and image characteristics. [0004] Recent developments in the field of printing plate precursors concern th...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G03C1/04G03C5/00
CPCB41C1/1008B41C2210/24C09D4/06G03F7/033G03F7/0388C08F8/14B41C2210/22Y10S430/165Y10S430/111C08F2810/30B41C1/1016B41C2201/02B41C2201/14B41C2210/04B41C2210/06B41C2210/08B41C2210/10B41C2210/12C08F220/02
Inventor TAO, TINGBECKLEY, SCOTT A.
Owner EASTMAN KODAK CO
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