Abstract: The present invention relates to a polymerized toner prepared by suspension polymerization. In particular, the polymerized toner comprises a plurality of toner particles that each comprising a binder resin, a pigment, a pigment stabilizer, a charge control agent, and a wax. The polymerized toner maintains a ratio of toner particles containing at least two wax domains per particle within a defined range. Thereby, the polymerized toner achieves high glossiness and good transfer efficiency.

Abstract: This present invention relates to a method of preparing a polymerized toner, which comprises the steps of: preparing an aqueous dispersion medium containing calcium phosphate; preparing a monomer mixture including a styrene-based pigment stabilizer having a weight average molecular weight of 2,000 to 200,000, a charge control agent, a pigment, and a monomer for binder resin; dispersing the monomer mixture in the form of droplets in the aqueous dispersion medium; and performing suspension polymerization for the monomer mixture dispersed in the form of droplets, and calcium phosphate is used in an amount of 2 to 6 parts by weight based on 100 parts by weight of the monomer mixture. Also, a polymerized toner produced using this method is provided.

Abstract: A color filter substrate is provided. In the color filter substrate, transparent protective films are formed on respective sub-pixels of a color filter. The color filter substrate has improved electric field characteristics without the need for additional optical or circuit compensation to achieve an improvement in contrast and a reduction in color difference.

Abstract: A novel photoactive compound is provided. The photoactive compound has a structure represented by Formula 1: wherein R1, R2, R3, A, X, Y, n and m are as defined in the specification. The photoactive compound efficiently absorbs UV light. Accordingly, the photoactive compound has an improved ability to generate radicals and is efficiently photopolymerized with unsaturated bonds. Further provided is a photosensitive resin composition comprising the photoactive compound. The photosensitive resin composition has good sensitivity because it efficiently absorbs UV light. In addition, the photosensitive resin composition has excellent characteristics in terms of residual film ratio, mechanical strength and resistance to heat, chemicals and development. Therefore, the photosensitive resin composition is advantageously used in curing materials for column spacers, overcoats and passivation films of liquid crystal display devices.

Abstract: Disclosed is a method for producing a polymerized toner. In the method, a mixture of colloidal silica as an aqueous dispersant and a polyvinylpyrrolidone is used during suspension polymerization. The amount of polyvinylpyrrolidone/colloidal silica aggregates having a diameter smaller than 100 nm is also limited to 1% by weight or less, based on the total weight of all aggregates. A polymerized toner produced by the method has a volume average particle diameter (dv) of 5 to 10 ?m and a volume average particle diameter/number average particle diameter ratio (dv/dp) of 1.5 or less. The polymerized toner is consumed in a small amount during printing. According to the method, the formation of emulsion particles having a size smaller than 0.5 ?m is inhibited.

Abstract: A polymerized toner is provided. The polymerized toner has cores containing a wax with a polydispersity of 1.05 to 1.1. The fixability of the polymerized toner is improved by the presence of the wax. Further provided is a method of producing the polymerized toner.

Abstract: A polymerized toner is provided. The polymerized toner comprises a reactive anionic surfactant having at least one reactive functional group. The reactive anionic surfactant is added simultaneously with a dispersant to prepare an aqueous dispersion or is added within 2 hour after a polymerization reaction of a monomer mixture is initiated in an aqueous dispersion. This simultaneous or rapid addition allows the reactive anionic surfactant to be dispersed on the surface of the toner particles. The reactive anionic surfactant is located over the entire surface of the toner particles to increase the surface charge density of the toner, achieving good charge stability and excellent imaging characteristics.

Abstract: The present invention relates to a dendritic photoactive compound that comprises oxime ester and a method for producing the same. Since the compound according to the present invention comprises two or more oxime ester groups and chromophores in one molecule at the same time, the solubility in respects to the organic solvent and the efficiency for producing a radical by absorbing ultraviolet rays are excellent. In addition, it can act as an effective initiator in respects to the photopolymerization of the unsaturated group, in particular, the acryl compound.

Abstract: A method for producing a toner is provided. The method comprises the steps of (1) dispersing a water-soluble polyvinyl alcohol having a degree of polymerization of 1,500 to 2,500 and a degree of saponification of 75 to 98% in an aqueous medium to prepare an aqueous dispersion of the polyvinyl alcohol, (2) preparing a mixture of monomers, (3) mixing the aqueous dispersion with the monomer mixture, and (4) polymerizing the monomers.

Abstract: A photopolymerization initiator is provided. The photopolymerization initiator contains at least one unsaturated double bond and at least one oxime ester group in the molecule. The photopolymerization initiator comprises a compound represented by Formula 1 or 2: wherein R1 and R2 are each independently —CH3, —C2H5, —C3H7 or —C6H5; wherein R3, R4 and R5 are each independently —CH3, —C2H5, —C3H7 or —C6H5. Further provided is a photosensitive resin composition comprising the photopolymerization initiator. The use of the photosensitive resin composition in photolithography reduces the formation of volatile residue during post-development baking.

Abstract: The present invention relates to a process for preparing a polymerized toner, and in particular to a process for preparing a polymerized toner and a polymerized toner prepared therefrom, wherein a certain block copolymer and copper phthalocyanine are used within a predetermined range of the amounts for a carbon black dispersant during a suspension polymerization, thereby making it possible to realize a narrow particle sizes distribution, high transcription efficiency, and an enhanced image concentration.

Abstract: The present invention relates to a photoactive compound of a novel structure represented by Chemical Formula 1 below In Chemical Formula 1, R1 and R2, R3, and A are as defined in the specification, and a photosensitive resin composition comprising the same. The photoactive compound of the present invention comprises a nitro group and a phosphonate structure and thus exhibits excellent sensitivity through efficient absorption for UV light, excellent compatibility between the photoactive compound and the alkali-soluble binder resin, and an improved solubility of the photosensitive resin composition. Furthermore, the photosensitive resin composition of the present invention has excellent residual film thickness and mechanical strength characteristics and heat-resistant, chemical-resistant, and development-resistant properties.

Abstract: The present invention relates to a pressure fixing toner which can be fixed at a lower temperature to enable energy-efficient high-speed printing, and a preparation method thereof. The pressure fixing toner comprises: a core which comprises a wax mixture including a wax and a pigment; and a shell which comprises a polymer or copolymer of at least one kind of polymerizable monomer selected from the group consisting of an aromatic vinyl-based monomer, an acrylate-based monomer, a methacrylate-based monomer and a diene-based monomer, and surrounds the core. The content of the wax of the core is 44-93 parts by weight based on 100 parts by weight of the total toner.

Abstract: The invention relates to toner particles having excellent charging characteristics and transferring properties, a method for producing the same and toner including the same. More particularly, the invention relates to toner particles, a method for producing the same and toner including the same, in which a CCA highly compatible with a binder resin is readily dispersed in the binder resin, thereby improving charge-maintaining property and charge distribution, and the resultant mixture is sphered to realize excellent long term credibility and transfer property. The toner particles include a styrene/acrylate-based CCA; a styrene/acrylate-based binder resin; and a polyester-based binder resin.

Abstract: Provided are an alkali soluble binder resin that includes a monomer including an unsaturated double bond, an unsaturated double bond character monomer including a carboxylic acid and an unsaturated double bond character monomer including an allyl group as a repeating unit, in which a molecular weight distribution (Mw/Mn) is in a range of about 2.0 to about 3.5, and a negative-type photosensitive resin composition including the alkali soluble binder resin. Re-solubility, fine-patterned substrate adhesion and dispersion stability may be improved by including the alkali soluble binder resin according to the present invention.

Abstract: The present invention relates to a photoactive compound of a novel structure represented by Chemical Formula 1 below In Chemical Formula 1, R1 and R2, R3, and A are as defined in the specification, and a photosensitive resin composition comprising the same. The photoactive compound of the present invention comprises a nitro group and a phosphonate structure and thus exhibits excellent sensitivity through efficient absorption for UV light, excellent compatibility between the photoactive compound and the alkali-soluble binder resin, and an improved solubility of the photosensitive resin composition. Furthermore, the photosensitive resin composition of the present invention has excellent residual film thickness and mechanical strength characteristics and heat-resistant, chemical-resistant, and development-resistant properties.

Abstract: A photoresist composition is provided. The photoresist composition comprises two or more kinds of photoinitiators having different activation wavelengths whose difference is at least 20 nm. The photoresist composition has high sensitivity and forms a pattern whose thickness is easy to control depending on the exposure intensity through a slit or transflective mask. Further provided are a transparent thin film formed using the photoresist composition and a liquid crystal display device comprising the thin film.

Abstract: There is provided a toner having good charging characteristics that is composed of a core region and a thin shell in which a charge control agent is densely distributed so as to improve charging characteristics of the toner, and a method for manufacturing the same. The method for manufacturing a toner having a bi-layered structure includes: producing a toner core using a suspension polymerization method; preparing a suspension of toner particles having a core-shell structure by forming a rigid shell on a surface of the toner core; and recovering the toner particles from the suspension as a post-processing operation.

Abstract: A novel alkali-soluble polymer compound including a dehydrogenated pimaric acid and/or its isomer as a repeating unit, and a photosensitive resin composition including the alkali-soluble polymer compound as an effective binder matrix are provided. A photosensitive resin composition using the alkali-soluble polymer compound including a dehydrogenated resin acid has excellent photosensitivity and developing characteristics cause a less deformation in a firing process, has excellent elasticity. Thus, the photosensitive resin composition is advantageous for curing various transparent photosensitive materials, in particular, materials of column spacers, an overcoat, a passivation layer, or the like, used for fabricating color filters of an LCD.

Abstract: A process for preparing toner and a polymerized toner prepared thereby are provided. The process for preparing toner comprises: forming an aqueous dispersion medium comprising calcium phosphate; forming a monomer mixture of a polymer charge control agent having weight average molecular weight of about 10,000 to 20,000, pigment, and a monomer for a binder resin; dispersing the monomer mixture in the aqueous dispersion in the form of droplets; and suspension-polymerizing the monomer mixture dispersed in the form of droplets, wherein about 2 to 6 parts by weight of the calcium phosphate and about 0.6 to 10 parts by weight of the charge control agent are used, on the basis of 100 parts by weight of the monomer mixture.