Abstract: The present invention relates to a method of preparing a thermoplastic resin, a method of preparing a thermoplastic resin composition including the same, and a method of manufacturing an injection-molded article using the thermoplastic resin composition. By using a mixture of molecular weight modifiers having different reactivities according to the present invention, coagulation may be performed using a small amount of coagulant, productivity may be increased, and a molded article, which is manufactured using a thermoplastic resin, having excellent appearance characteristics along with superior mechanical strength, processability, or the like may be provided.

Abstract: The present invention relates to a thermoplastic resin. More particularly, the present invention relates to a thermoplastic resin that is a graft copolymer having a seed-shell structure and includes a bimodal seed including a large-diameter rubbery polymer having an average particle diameter of greater than 2,000 ? and 3,500 ? or less and a small-diameter rubbery polymer having an average particle diameter of 500 ? to 2,000 ?; and an aromatic vinyl-vinyl cyan shell, wherein the aromatic vinyl cyan compound is included in an amount of 5% by weight to 28% by weight based on a total weight of the aromatic vinyl-vinyl cyan shell. In accordance with the present invention, a thermoplastic resin having a composition capable of improving graft density, and a thermoplastic resin composition capable of increasing dispersion and having high gloss due to inclusion of the thermoplastic resin are provided.

Abstract: The present invention relates to an ultrasonic nonlinearity measuring method generated by a high voltage pulser and more specifically, includes a calibration step of transmitting and receiving an ultrasonic signal to and from an object to be inspected having a reception probe attached thereto, by a receiving unit; a harmonic wave measuring step of transmitting a tone burst signal to an object to be inspected having a transmission/reception probe attached thereto and receiving the tone burst signal which passes through the object to be inspected, by the receiving unit; a harmonic wave measuring step of transmitting a tone burst signal to an object to be inspected having a transmission probe attached thereto and receiving the transmitted tone burst signal, by a transmitting unit; a calibration step of transmitting and receiving an ultrasonic signal to and from an object to be inspected having a transmission probe attached thereto, by the transmitting unit; and a step of measuring an ultrasonic nonlinearity of t

Abstract: The present invention relates to a method for preparing a graft copolymer including polymerizing a conjugated diene-based monomer to prepare a small-size conjugated diene-based polymer; enlarging the small-size conjugated diene-based polymer to prepare a large-size conjugated diene-based polymer; and polymerizing the small-size conjugated diene-based polymer, the large-size conjugated diene-based polymer, an aromatic vinyl-based monomer and a vinyl cyan-based monomer to prepare a graft copolymer, wherein a weight ratio of the small-size conjugated diene-based polymer and the large-size conjugated diene-based polymer is 10:90 to 40:60 in preparing the graft copolymer.

Abstract: Provided is an apparatus for assessing degradation and estimating strength by using ultrasound, in which the apparatus includes: an ultrasound transmitting unit making an ultrasound signal having a single frequency be incident in an inspected object; an ultrasound receiving unit receiving the ultrasound signal penetrating the inspected object or reflected on the inspected object; a signal processing unit calculating a propagation speed through a time interval of the ultrasound signal received by the ultrasound receiving unit and separates the received ultrasound signal into a fundamental frequency component and a harmonic component to calculate non-linear parameter, and measuring linear and non-linear elastic coefficients by using the propagation speed and the non-linear parameter; and a strength estimating unit obtaining a tensile curve by using the linear and non-linear elastic coefficients and estimating at least one of tensile strength and yield strength by using the tensile curve.

Abstract: The present invention relates to an ABS graft copolymer, a method of preparing the same, and a thermoplastic resin composition including the same. More specifically, when an ABS graft copolymer is prepared using emulsion polymerization, a phosphate ester-based reactive emulsifier capable of acting as a metal deactivator is added, thereby reducing the amount of undesired residues remaining in the ABS graft copolymer latex. As a result, thermal stability may be improved without adding a heat stabilizer. In addition, compatibility between the ABS graft copolymer and the aromatic vinyl compound-vinyl cyanide compound copolymer may be improved by the phosphate ester-based reactive emulsifier. Therefore, a final molded part having improved impact resistance, e.g., increased impact strength, and having improved appearance quality, e.g., excellent whiteness, while having excellent thermal stability may be prepared.

Abstract: The present invention relates to a heat-resistant resin and a method of preparing the same. More particularly, the present invention relates to a heat-resistant resin including 100 parts by weight of a styrene based resin and 0.5 to 5 parts by weight of silica having a contact angle of 10 to 60° and an average particle diameter of 0.1 nm or more and 100 nm or less, a method of preparing the same and a heat-resistant resin composition including the same. In accordance with the present invention, provided are a heat-resistant resin having a low moisture content and a small content of fine particles while having heat resistance equal to or higher than conventional resins and, accordingly superior cohesion, a method of preparing the same, and a heat-resistant resin composition including the same.

Abstract: Provided are a method for preparing a conjugated diene-based polymer and a method for preparing a graft copolymer including the same. The method for preparing a conjugated diene-based polymer includes enlarging a first conjugated diene-based polymer in multiple stages to prepare a second conjugated diene-based polymer, wherein the multi-stage enlargement includes a primary enlargement stage and a secondary enlargement stage, and a weight ratio of acids added in the primary enlargement stage and the secondary enlargement stage is 70:30 to 90:10. A graft copolymer prepared by the above-described method can be used to form a thermoplastic resin molded article excellent in all of plating characteristics, mechanical properties, surface characteristics, colorability, and processability.

Abstract: An acoustic resonator comprises a substrate, a resonant portion disposed on the substrate and in which a first electrode, a piezoelectric layer, and a second electrode are stacked, a protective layer disposed on an upper portion of the resonant portion, and a hydrophobic layer formed on the protective layer, and the protective layer comprises a first protective layer stacked on the second electrode and a second protective layer stacked on the first protective layer, wherein a density of the second protective layer is higher than a density of the first protective layer.

Abstract: The present invention relates to a method for preparing a graft copolymer, which includes polymerizing a first conjugated diene-based polymer, a second conjugated diene-based polymer, an aromatic vinyl-based monomer and a vinyl cyan-based monomer, wherein particle size distribution of the first conjugated diene-based polymer is 0.346 to 0.404, and particle size distribution of the second conjugated diene-based polymer is 0.196 to 0.304, a graft copolymer and a thermoplastic resin molded article.

Abstract: An acoustic resonator package includes a substrate, an acoustic resonator disposed on the substrate, the acoustic resonator including a first hydrophobic layer, a cap configured to accommodate the acoustic resonator, a bonding portion configured to bond the substrate to the cap, and a second hydrophobic layer disposed on the substrate at a position between the acoustic resonator and the bonding portion.

Abstract: A thin film capacitor includes a body including a lower electrode formed on a substrate, a plurality of first electrode layers, and a plurality of second electrode layers stacked alternately with the plurality of first electrode layers, with one of the dielectric layers interposed therebetween. The lower electrode and the first electrode layer have the same polarity as each other, and surface roughness of the first and second electrode layers is less than that of the dielectric layers, thereby securing capacitance and characteristics of the dielectric layers.

Abstract: The present invention relates to a thermoplastic resin, a method of preparing the thermoplastic resin, and a thermoplastic resin composition including the thermoplastic resin. More particularly, the present invention relates to a thermoplastic resin characterized by maximizing a ratio of monomers grafted to rubber particles and a graft rate so as to maintain a rubber particle shape in a high shear environment and varying the composition of each of monomers grafted to the inside and outside of rubber particles, a method of preparing the thermoplastic resin, and a thermoplastic resin composition having superior impact strength, falling dart impact strength, heat deflection temperature, chemical resistance, and plating adhesion strength due to inclusion of the thermoplastic resin.

Abstract: There is provided a MEMS sensor including: a mass body; a support part floatably supporting the mass body; and a flexible beam having one end connected to the mass body and the other end connected to the support part. At least one end of the flexible beam connected to the mass body or the support part includes a curved portion to maximize an effective length supporting a load.

Abstract: The present invention relates to an ABS graft copolymer, a method of preparing the same, and a thermoplastic resin composition including the same. More specifically, when an ABS graft copolymer is prepared using emulsion polymerization, a phosphate ester-based reactive emulsifier capable of acting as a metal deactivator is added, thereby reducing the amount of undesired residues remaining in the ABS graft copolymer latex. As a result, thermal stability may be improved without adding a heat stabilizer. In addition, compatibility between the ABS graft copolymer and the aromatic vinyl compound-vinyl cyanide compound copolymer may be improved by the phosphate ester-based reactive emulsifier. Therefore, a final molded part having improved impact resistance, e.g., increased impact strength, and having improved appearance quality, e.g., excellent whiteness, while having excellent thermal stability may be prepared.

Abstract: The present invention relates to a method of preparing a thermoplastic resin, a method of preparing a thermoplastic resin composition including the same, and a method of manufacturing an injection-molded article using the thermoplastic resin composition. By using a mixture of molecular weight modifiers having different reactivities according to the present invention, coagulation may be performed using a small amount of coagulant, productivity may be increased, and a molded article, which is manufactured using a thermoplastic resin, having excellent appearance characteristics along with superior mechanical strength, processability, or the like may be provided.

Abstract: The present invention relates to an ultrasonic nonlinearity measuring method generated by a high voltage pulser and more specifically, includes a calibration step of transmitting and receiving an ultrasonic signal to and from an object to be inspected having a reception probe attached thereto, by a receiving unit; a harmonic wave measuring step of transmitting a tone burst signal to an object to be inspected having a transmission/reception probe attached thereto and receiving the tone burst signal which passes through the object to be inspected, by the receiving unit; a harmonic wave measuring step of transmitting a tone burst signal to an object to be inspected having a transmission probe attached thereto and receiving the transmitted tone burst signal, by a transmitting unit; a calibration step of transmitting and receiving an ultrasonic signal to and from an object to be inspected having a transmission probe attached thereto, by the transmitting unit; and a step of measuring an ultrasonic nonlinearity of t

Abstract: The present disclosure relates to a method of preparing a heat-resistant SAN resin. More particularly, the present disclosure provides a method of preparing a heat-resistant SAN resin enabling provision of superior productivity and improved heat resistance and fluidity without generation of odor during processing, and a heat-resistant SAN resin composition prepared by the method.

Abstract: The present disclosure relates to a method of preparing a heat-resistant SAN resin. More particularly, the present disclosure provides a method of preparing a heat-resistant SAN resin enabling provision of superior productivity and improved heat resistance and fluidity without generation of odor during processing, and a heat-resistant SAN resin composition prepared by the method.

Abstract: The present invention relates to a thermoplastic resin, a method of preparing the thermoplastic resin, and a thermoplastic resin composition including the thermoplastic resin. More particularly, the present invention relates to a thermoplastic resin characterized by maximizing a ratio of monomers grafted to rubber particles and a graft rate so as to maintain a rubber particle shape in a high shear environment and varying the composition of each of monomers grafted to the inside and outside of rubber particles, a method of preparing the thermoplastic resin, and a thermoplastic resin composition having superior impact strength, falling dart impact strength, heat deflection temperature, chemical resistance, and plating adhesion strength due to inclusion of the thermoplastic resin.