High refractive index product possessing microscopic structure
A technology of microstructure and products, applied in the direction of diffusion components, instruments, optical components, etc., can solve problems such as unfavorable physical properties
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Embodiment 1
[0058] Into a 3-neck flask equipped with an addition funnel, temperature probe and mechanical stirrer was charged 31.2 ml of 2,2,4-trimethylhexane 1,6-diisocyanate and 50 mg of dilauric acid Dibutyltin ester. The additional funnel was filled with 39.75 g of warm polycaprolactone diol (Mn. 530), which was added to the contents of the flask at 55-60°C. The mixture was then stirred at 65°C for 14 hours. Subsequently, the flask was cooled to 55°C and a mixture of 18.7 ml 2-hydroxyethyl methacrylate and 100 mg hydroquinone monomethyl ether was added while maintaining the temperature in the range of 54-58°C. The mixture was stirred at 55°C for 10-12 hours until complete as confirmed by infrared spectroscopy. This product is the desired oligomeric polyurethane dimethacrylate, sometimes referred to hereinafter as "oligomeric dimethacrylate".
Embodiment 2
[0060]105g of titanium tetraisopropoxide (titanium tetraisopropoxide) was added to a mixture of 1000g of 2-propanol, 49.05g of concentrated hydrochloric acid and 5.25g of distilled water under stirring. After addition of 0.23 g of a 33% 4-OH TEMPO solution in 1-methoxy-2-propanol and 13.75 g of 3-methacryloxypropyltrimethoxysilane, the resulting mixture was stirred at room temperature 72 hours. After transferring 447 g of the solution to a round bottom flask and stripping most of the volatiles using a rotary evaporator, the solution was heated at 50°C for 6.5 hours. Add 140 g of propylene glycol methyl ether acetate and continue stripping at 55°C under full vacuum. Stripping was stopped when the solution weighed 171 g, and an additional 137 g of propylene glycol methyl ether acetate was added to the flask. Stripping was continued until the solution weighed 236 g. Gravimetric analysis by stripping all volatiles to determine the solids content of the resulting titanium-contai...
Embodiment 3
[0062] 49.5 parts of an oligomeric polyester urethane diacrylate mixture is commercially available from Sartomer Co. under the trademark "CN-985B88" and vacuum stripped to provide 50 parts of the amount of the product of Example 2 of titanium, 0.5 parts of "Darocur 4265" (as a 10% solution in 1-methoxy-2-propanol) are added. The resulting composition was spin-coated from 1-methoxy-2-propanol onto a bisphenol A polycarbonate plaque and cured by exposure to ultraviolet radiation emitted by a single "H" bulb. The resulting coating had a haze value of 0.43%, an abrasion rate of 25.7 and an adhesion rate of 0B. It is expected that adhesion can be improved by adding smaller proportions of multifunctional (meth)acrylate monomers, as determined by simple experimentation.
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