Novel radiation curable compositions
A radiation-cured, hyperbranched polymer technology for use in inks, coatings, home appliances, etc. to address issues such as the negative impact of physical properties such as scratch resistance
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[0204] Process for the preparation of radiation curable inkjet inks
[0205] Dispersions of colorants for use in radiation curable inkjet inks can be prepared by mixing, milling and dispersing colorants and resins. Mixing equipment includes pressure kneaders, open kneaders, planetary mixers, dissolvers, and Dalton Universal Mixer. Suitable milling and dispersing equipment include colloid mills, high speed dispersers, twin-screws, sand mills, paint mixers, and triple-screws. Dispersions can also be prepared using ultrasonic means.
[0206] The mixing, milling and dispersing methods are each accompanied by cooling to prevent heat build-up and, where possible, are carried out under light conditions which substantially exclude UV light.
[0207] Radiation curable inkjet inks can be prepared by dispersing each colorant individually, or alternatively, several pigments can be mixed and milled together when preparing the dispersion.
Embodiment 1
[0230] This example illustrates the synthesis of a polymeric initiator with a hyperbranched polyglycidyl core, benzophenone as initiating functional group and acetyl group as compatibilizing group. The polymer initiators PI-1 to PI-2 are represented by the general formula PI-A.
[0231] Formula PI-A
[0232]
[0233] The synthesis was carried out according to the following scheme:
[0234]
[0235] Synthesis of p-benzophenoxyacetic acid:
[0236] 8.47 g (0.212 mol) of NaOH, 21 g (0.106 mol) of 4-hydroxybenzophenone and 10 g (0.106 mol) of chloroacetic acid were dissolved in 250 mL of water. The solution was heated at 100°C for 6 hours. After cooling to room temperature, the solution was acidified with concentrated HCl. Acetone was used to dissolve the precipitated benzophenone. Residual salts were removed by filtration, and the solvent was evaporated under reduced pressure. Chloroform was added and the mixture was refluxed for 2 hours. After cooling, the benzophen...
Embodiment 2
[0245] This example illustrates the efficiency of the polymeric initiator synthesized in Example 1 in a radiation curable composition.
[0246] Comparative radiation curable compositions COMP-1 and COMP-2 and inventive radiation curable compositions INV-1 to INV-3 were prepared according to Table 5. Weight percent (wt %) is based on the total weight of the radiation curable composition.
[0247] table 5
[0248]
[0249] The comparative initiator COIN-1 in this example was the methyl ester of p-benzophenoxyacetic acid.
[0250]
[0251] Coating of comparative radiation curable compositions COMP-1 and COMP-2 and inventive radiation curable compositions INV-1 to INV-3 on uncoated 100 μm PET substrates using a knife coater and a 10 μm wire wound rod . Each coating was cured using a Fusion DRSE-120 conveyor equipped with a Fusion VPS / I600 lamp (D bulb), which conveyed the samples on a conveyor belt under UV lamps at a rate of 20 m / min. The cure rates of the comparative r...
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