Modified pigment products and black matrixes comprising same
a technology of black matrixes and pigment products, applied in the direction of pigment treatment with macromolecular organic compounds, instruments, photomechanical devices, etc., can solve the problems of low resistivity of chromium films, high cost of metal vapor deposition process, and increasing environmental regulations for chromium use and disposal
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example 1
Polymer Preparation
[0052] Acrylic acid (4.8 g) was slowly added at 66° C. to a stirred solution of 30 g of bisphenol-A epoxy resin (EPON 1001F, available from Resolution Performance Products) in 30 g of THF. Tetraethyl ammonium bromide (0.2 g) was added as a catalyst and methoxyhydroquinone (0.1 g) as an antioxidant. The reaction was monitored by acid number measurements. After 30 hours of reaction in refluxing THF, hexahydrophthalic anhydride (10.5 g) was added to the reaction mixture and stirred for an additional 2 hr at the same temperature. The resulting carboxy acrylated polymer solution in THF was allowed to cool to room temperature and used without further isolation.
example 2
Modification of the Polymer
[0053] 1,4-phenylene diamine (2.95 g) was added to the polymer solution of Example 1 along with 250 mL of THF, and after dissolution, 5.6 g of dicyclohexylcarbodiimide (DCC) was added. The reaction mixture was stirred for 2 hr at room temperature and purified by filtration to remove the precipitated urea.
example 3
Preparation of a Modified Pigment Product
[0054] Modified polymer solution of Example 2 and 30 g of carbon black were mixed in a rotor stator. The carbon black had a surface area of 50 m2 / g and DBP of 46 mL / 100 g. Methanesulfonic acid (0.96 g) was added. A solution of 0.69 g of NaNO2 in 10 g of water was added drop-wise, and mixing was continued for an additional 3 hr. The resulting dispersion was purified by diafiltration using first acetone / THF (20 / 80) solution followed by acetone and finally propylene glycol methoxy ether acetate (PGMEA). The resulting dispersion was filtered sequentially through a series of filters (20 micron, 5 micron, 1 micron, and 0.5 micron).
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Abstract
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