RADIATION CURABLE HYBRID COMPOSITION AND PROCESS
First Claim
1. An organic-inorganic hybrid nano-composite material of high refractive index (nD), the composite being a substantially homogenous mixture and comprising:
- i) from about 1% to about 99% by weight of surface modified inorganic nano-particles where said particles comprise at least one surface modifier at their surface to increase the particles lipophobicity, said surface modifier comprising at least one acid selected from aromatic and/or sulfur-containing organic acids, phosphinic acids and phosphonic acids;
ii) from about 1% to about 99% by weight of at least one radiation curable polymer precursor and optionally a photo initiator.
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Abstract
There is described a process for preparing a hybrid organic inorganic nano-composite used to prepare high (nD≧1.52) refractive index (Rl) protective coatings for brightness enhancers for LCDs: the process comprising the steps of a) diluting an aqueous solution of inorganic nano-particles (such as ZrO2) with a first solvent (such as acetic acid or methyl ethyl ketone (MEK)) to form a dispersion; b) adding surface modifiers (such as 1-benzoyl acetone, diphenyl acetic acid, diphenyl phosphonic acid, ethylene methacrylate phosphate; 2,2,6,6-tetramethyl-3,5-heptanedione or neopentyl(diallyl)oxy trimethacryl zirconate); c) removing the first solvent to enhance the interactions between the surface modifier and nano-particles; d) washing the resultant slurry of surface modified lipophilic nano particles by repeated dilution with an azeotropic solvent mixture (such as ethyl acetate, toluene and water) and distillation to remove low Rl impurities and/or OH groups, e) adding a radiation curable polymer precursor (such as an optionally brominated epoxy acrylate to the mixture opt with a photo initiator (Pl); and f) removing the remaining solvent to form a solid composite comprising an intimate mixture of surface modified inorganic nano-particles and uncured polymer precursor.
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Citations
21 Claims
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1. An organic-inorganic hybrid nano-composite material of high refractive index (nD), the composite being a substantially homogenous mixture and comprising:
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i) from about 1% to about 99% by weight of surface modified inorganic nano-particles where said particles comprise at least one surface modifier at their surface to increase the particles lipophobicity, said surface modifier comprising at least one acid selected from aromatic and/or sulfur-containing organic acids, phosphinic acids and phosphonic acids; ii) from about 1% to about 99% by weight of at least one radiation curable polymer precursor and optionally a photo initiator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification