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Radiation curable hybrid composition and process

A radiation curing, compound technology, applied in dyeing low-molecular-weight organic compound processing, instruments, optical components, etc., can solve the problems of difficult to remove hydroxide groups, unsuitable for visual communication, etc., to achieve the effect of high refractive index

Inactive Publication Date: 2009-09-16
CYTEC SURFACE SPECIALTIES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Corning considers this solution-gel material unsuitable for visual communication end-use due to difficulty in removing hydroxide groups

Method used

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  • Radiation curable hybrid composition and process
  • Radiation curable hybrid composition and process

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0177] Example 1 (Non-Halogenated Nanocomposite and Coating Formulation)

[0178] Step 1.1

[0179] Bisphenylacetic acid (120 g from Alfa) was dissolved in 200 g of glacial acetic acid, and the mixture was stirred and heated to 50°C. Contains about 20.0% ZrO 2 A dispersion (500 g) of nanoparticles (average diameter approximately 5 nm, purchased from Nyacol, see table below) in acetic acid and water was added dropwise to the acid mixture. After the addition of nanoparticles, 14.45 g of surface modifier NZ-33 (see table below) was added dropwise with continued stirring. Volatile components were removed from the resulting mixture under gradually reduced pressure while maintaining the overall temperature at 50 to 60°C.

[0180] Step 1.2

[0181] Once no significant condensation of the volatile components is observed, 320 g of 2-phenoxyethylacrylic acid (commercially available from Cytec under the registered trademark 114), the mixture is subjected to gradual depressurizat...

example 2

[0185] Example 2 (Halogenated Nanocomposites and Coating Formulations)

[0186] In addition to UV-curable ex-polymers are 150 Brominated analogues of epoxy acrylic acid (ie bisphenol A moiety substituted by 4 bromine-containing groups) (prepared by the applicant), Example 2 was prepared in a manner similar to that described in Example 1. The ingredients used to prepare this product are listed in the table below.

[0187] Table 1

[0188]

[0189] The product properties are as follows, Refractive Index (measured with a refractometer from Fischer Scientific Co) = 1.5851. Clear liquid with >99% solids.

[0190] Coated film from Example 2.

[0191] Example 2 (20g) and 0.6g 1173 (a traditional photoinitiator), and the coating film was applied to the substrate of PET film by the traditional method of applicator roll. The coating was UV cured in four passes at 100 ft / min under two medium pressure mercury H lamps to form a film coating with a refractive index of 1.6120 (me...

example 3

[0192] Example 3 (Non-Halogenated Sulfur-Containing Nanocomposites and Coating Formulations)

[0193] The following surface modifiers were mixed: 1-benzoylacetone (0.26g); bisphenylacetic acid (2.55g); bisphenylphosphinic acid (0.26g) and (0.26 g, see table). The mixture was completely dissolved (3.33 g) with acetic acid (51 g) at 60°C to form a surface modifier solution.

[0194] The aqueous dispersion of nanoparticles (42.5 g) was stirred. This dispersion contains 20% by mass of zirconia nanoparticles, 12% by mass of acetic acid and 68% by mass of water, which can be used as ZrO 2 Obtained from Nyacol Nano Technologies.

[0195] The surface modifier solution was slowly added to the stirred nanoparticle dispersion to obtain a mixture with a viscosity of about 20 cp at 25°C after addition. The mixture was then heated to 60° C., stirred with a Rotovap and left for 2 hours without decompression. The mixture was then heated in a Rotovap to remove acetic acid and water unde...

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PUM

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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.

Description

technical field [0001] The present invention relates to the field of radiation curable compositions, in particular hybrid organic-inorganic composites for the preparation of protective coatings with a high refractive index. Background technique [0002] In many vision applications, it is desirable for coatings to exhibit a high index of refraction. For example, high-refractive-index coatings can be used as brightness-enhancing films (also known as prismatic films) for flat panel displays, such as liquid crystal displays (LCDs). Polarizing films used in LCDs also require a hard coating with a high refractive index. Such coatings are also expected to provide enhanced protective properties to the substrate, such as enhanced scratch and scratch resistance. [0003] Protective coatings can be prepared from inorganic or organic materials. Inorganic materials (especially those containing nano-sized particles) can provide high resistance and have a high refractive index, but coat...

Claims

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Application Information

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IPC IPC(8): C08K3/22C08K9/04C09C1/00C09C3/08C09D133/00C09D133/08C09D133/10G02B1/00C08J5/00
Inventor 王志凯哈勒尔·特威迪
Owner CYTEC SURFACE SPECIALTIES INC
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