Earticle

In this study, to find the possibility of a fundamental approach to industrialize of microwave energy in the area of polymer synthesis area instead of conventional heating process, we tried to synthesize the cross-linked polyester resin used as surface coating material in the area of printing technology. With changing the size of glass bead and the amount of NPG, the samples were synthesized at 220～235℃ for 3～5h using microwave synthetic unit. The samples were characterized by means of and characterized by Ioh, Iac, viscosity, and degree of transparency. It was found that the samples may be synthesized at lower temperature and shorter time under microwave processing, compared to conventional process.

Novel biphenol compound with extended ð-conjugate system, oxadiazole chromophore, as shown in Scheme 1, has been designed and synthesized as an electron transporting compound for fabricating single-layer organic photoreceptors(OPC) which are useful for positive charging mode. It is examined their properties and good compatibilities to a binder resin. The electron transporting behavior is discussed based on the fundamental functions of its electric field, temperature and intermolecular distance dependencies in molecularly doped system using Time of Flight(TOF) technique.

The physical characteristic of paper influences ink receptivity and printability, therefore, the percent of ink transfer is increased as the density of paper increases whether the viscosity of ink is varied. In a case of low sizing paper, it interprets to the percent of ink transfer increase by ink penetration inside a paper, and in a case of high sizing paper, relatively, it interprets a result from restraining ink penetration

GCR(gray component replacement) refers to replacement of the gray component of trichromatic colors with black during color separation, and the black printer for process color printing is determined by GCR. For high quality offset color printing, not only the GCR method for actual printing system but also the method for color proofing system has to be examined enough to prepare the optimum black printers. In this paper, the considerations for the optimum GCR methods for both dye sublimation type digital proofer and actual offset press are discussed and recommended via the comparative analysis on color differences and spectral reflectance curves between the color patches before and after GCR of various percentage.

Distributed web-printing need color management just as traditional printing does. The creator of web-printing does not know how many different systems will ultimately present that web-printing, what type of devices will used to present the web-printing, therefor image color of output devices will not be discord with native color of source image. This problem can solve at the time web-printing is created. The web-printing can solve by send to embed in the GIF, JPEG image an device color information describing the source image of creator.

Solvent type inks for surface printing of the hard coated polycabonate have some problems that are solvent ejection and dropping productivity because of drying time and twice coating process. In this study, an attempt was made to examine both the formulation of UV ink replacing solvent type ink and the properties of ink films formed through screen printing using UV ink and exposure. The UV ink was prepared by first mixing pigment in epoxy type prepolymer A that has rheological excellence, excellent curing property and adhesive strength with hard coated polycabonate. To this paste, HSP 188 as the photoinitiator that has excellent miscibility with the epoxy type prepolymer A and excellent curing property was added and throughly mixed. After optimization of the UV ink formulation and process, UV ink had good dispersibility of pigment. And after UV curing, ink film had adhesive strength with hard coated polycabonate and strong solvent resistance. Also use of UV ink could shorten manufacturing process because the second UV coating process and ink dry process were not existed. and could improve print working environment because there is no solvent ejection.

An efficient microwave processing has been developed for the synthesis of metal phthalocyanines (MPc: M=Cu, Mn, Al, Co and Zn) through the condensation reaction of phthalic anhydride and urea with various metal chlorides in the presence of ammonium molybdate catalyst under solvent-free condition using microwaves, as a green chemistry procedure. It was demonstrated that microwave processing combined with solvent-free techniques leads to shorter reaction times, higher yields, cleaner reaction products and easier work-up than classical processing. The products synthesized at various temperature, time and kind of metal have been analyzed by means of X-ray diffractometry(XRD) and scanning electron microscopy(SEM).

Sodium alginate prepared from alginic acid was then graft copolymerized with acrylic acid monomer using hydrogen peroxide(H2O2) as an initiator, and the grafted copolymer was identified by IR spectroscopy method. When the amounts of sodium alginate, acrylic acid and hydrogen peroxide was kept constant in the reaction medium and then the contents of emulsifier was varied, SA conversion showed the maximum at the 3.0g of emulsifier and above that value it showed the downward trend. In the aqueous sodium alginate solution when the amounts of acrylic acid, hydrogen peroxide and emulsifier was remained constant and then the contents of sodium alginate was varied, AA conversion showed the maximum at the 15.0g of sodium alginate and above that value it showed the downward trend.

In this paper, high luminescent red, green and blue phosphors were synthesized by combinatorial chemistry with bodies and activators, which are (Y2O3:Eu2+Gd2+)B2O3 and Y2O3 : Eu2O3 : Gd2O3 for red, BaMg2Al16O27:Eu2+ Mn2+ and Eu2O3 : Mn2O3 for green, BaMg2Al16O27:Eu2+　Ce2+ and CeO2 : Eu2O3 for blue respectively. In order to investigate crystalline property of phosphorous body according to calcinatonal temperature, BaMg2Al12O19(blue phosphor) were calcinated at 1200, 1250, 1300 and 1400℃ respectively, studied by XRD. At result of XRD patterns, fluorescent phosphors synthesized at above 1300℃ are higher crystalline. The red phosphor only composed of the rare-earth elements as body and activator exhibits stronger intensity than that used Al2O3 as body and V2O3 as activator. Green phosphors synthesized with MnO or Mn2O3 as activator, show the different crystallization, spectrum intensity of them with Mn2O3 is higher. Being added with BaCO3 and CeO2 : Eu2O3 as activator, in the synthesis of blue phosphors, the crystallization and spectrum intensity of them are higher. Especially, blue phosphor added with CeO2 exhibits higher spectrum intensity and strong XRD peak.

In the thick film process, the individual layer is deposited by screen printing. Each screen mesh may differ according to requiring ink deposit thickness. Four screen mesh counts of 100, 150, 200, and 305 threads per inch are chosen and a designed test figure is exposed on them for printing experiment to measure the ink deposit thickness. These variables affect as much as around 50% compared with the theoretical ink volume listed by the mesh manufacturer and each variable has different influence on the thickness.