Abstract: A method for evaluating long-term durability of a resin for piping is provided. Unlike the conventional FNCT evaluation method requiring a long period of time, the method disclosed herein is capable of predicting long-term durability of a resin for piping in a short time, by a simple calculation using a content of tie molecules, an entanglement molecular weight (Me) and a content of ultrahigh molecular weight components. In addition, the olefinic polymer is configured to have a predetermined relationship in relation to the content of tie molecules, the entanglement molecular weight (Me) and the content of ultrahigh molecular weight components, whereby the polymer of the present application can be used in the manufacture of a heating pipe requiring excellent long-term durability.

Abstract: The present invention relates to a hybrid supported metallocene catalyst and a polyolefin preparation method using the same. Using the hybrid supported metallocene catalyst can not only significantly reduce the amount of wax produced when polymerizing olefin monomers, but can also enhance the stress cracking resistance of the polyolefin that is prepared.

Abstract: The present invention relates to a method for predicting the physical properties of polymers. More specifically, the present invention relates to a method for predicting the processability of polymers using a molecular weight distribution curve.

Abstract: The present disclosure relates to an assessment method for a polyethylene resin, and more specifically to a new assessment method for a polyethylene resin which can accurately determine long-term durability of a molded article by using physical properties that are easily measurable in a short time.

Abstract: A method for evaluating long-term durability of a resin for piping is provided. Unlike the conventional FNCT evaluation method requiring a long period of time, the method disclosed herein is capable of predicting long-term durability of a resin for piping in a short time, by a simple calculation using a content of tie molecules, an entanglement molecular weight (Me) and a content of ultrahigh molecular weight components. In addition, the olefinic polymer is configured to have a predetermined relationship in relation to the content of tie molecules, the entanglement molecular weight (Me) and the content of ultrahigh molecular weight components, whereby the polymer of the present application can be used in the manufacture of a heating pipe requiring excellent long-term durability.

Abstract: The present invention relates to a method for predicting the physical properties of polymers. More specifically, the present invention relates to a method for predicting the processability of polymers using a molecular weight distribution curve.

Abstract: The present invention relates to a method for predicting the physical properties of polymers. More specifically, the present invention relates to a method for predicting long-term stability of polymers using a molecular weight distribution curve.

Abstract: In the present invention, there is provided an olefin polymer which has excellent processability and dimensional stability and thus is useful for hollow molding of pipes or the like.

Abstract: Provided is an olefin-based polymer with excellent processability. The olefin-based polymer according to the present invention has a high molecular weight and a broad molecular weight distribution to show excellent processability and improved mechanical properties, thereby being usefully applied according to the intended use.

Abstract: The present invention relates to a hybrid supported metallocene catalyst and a polyolefin preparation method using the same. Using the hybrid supported metallocene catalyst can not only significantly reduce the amount of wax produced when polymerizing olefin monomers, but can also enhance the stress cracking resistance of the polyolefin that is prepared.

Abstract: The present disclosure relates to an assessment method for a polyethylene resin, and more specifically to a new assessment method for a polyethylene resin which can accurately determine long-term durability of a molded article by using physical properties that are easily measurable in a short time.

Abstract: The present invention relates to a method for predicting the physical properties of polymers. More specifically, the present invention relates to a method for predicting long-term stability of polymers using a molecular weight distribution curve.

Abstract: The present invention relates to an ethylene/alpha-olefin copolymer having excellent processability. The ethylene/alpha-olefin copolymer according to the present invention has low complex viscosity at high shear rate and has excellent processability, and thus it could be applied to the processing of a large diameter pipe, a complex pipe or the like.

Abstract: Provided is an olefin-based polymer with excellent processability. The olefin-based polymer according to the present invention has a high molecular weight and a broad molecular weight distribution to show excellent processability and improved mechanical properties, thereby being usefully applied according to the intended use.

Abstract: The present invention relates to an ethylene/alpha-olefin copolymer having excellent processability. The ethylene/alpha-olefin copolymer according to the present invention has low complex viscosity at high shear rate and has excellent processability, and thus it could be applied to the processing of a large diameter pipe, a complex pipe or the like.

Abstract: The present invention relates to an ethylene/1-hexene or ethylene/1-butene copolymer having excellent processibility. The ethylene/1-hexene or ethylene/1-butene copolymer according to the present invention has high molecular weight and wide molecular weight distribution, and thus excellent processibility, and has excellent environmental stress crack resistance, and thus, may be applied for a high inner pressure heating pipe, a mining pipe, or a large-diameter pipe, and the like.

Abstract: The present invention relates to an ethylene/1-hexene or ethylene/1-butene copolymer having excellent processibility. The ethylene/1-hexene or ethylene/1-butene copolymer according to the present invention has high molecular weight and wide molecular weight distribution, and thus excellent processibility, and has excellent environmental stress crack resistance, and thus, may be applied for a high inner pressure heating pipe, a mining pipe, or a large-diameter pipe, and the like.

Abstract: The present invention relates to a timing chain system including a hydraulic pressure timing chain tensioner autonomously controlling a hydraulic pressure for maintaining tension of a timing chain to effectively operate. The system may include: a crankshaft sprocket; a camshaft sprocket controlling exhaust or intake timing of the engine; a timing chain operably connecting the crankshaft and camshaft sprockets; a chain guide for the timing chain; a chain tensioner pushing the chain guide inward; and an oil supply unit for the chain tensioner. The chain tensioner may include a housing, an operating unit case fixed to the housing, a reciprocating plunger inserted into the operating unit case, a high pressure chamber, a low pressure chamber, a supply hydraulic path supplying oil from the oil supply unit to the low pressure chamber, and a regulator controlling hydraulic pressure of the low pressure chamber.

Abstract: The present invention relates to a timing chain system including a hydraulic pressure timing chain tensioner autonomously controlling a hydraulic pressure for maintaining tension of a timing chain to effectively operate. The system may include: a crankshaft sprocket; a camshaft sprocket controlling exhaust or intake timing of the engine; a timing chain operably connecting the crankshaft and camshaft sprockets; a chain guide for the timing chain; a chain tensioner pushing the chain guide inward; and an oil supply unit for the chain tensioner. The chain tensioner may include a housing, an operating unit case fixed to the housing, a reciprocating plunger inserted into the operating unit case, a high pressure chamber, a low pressure chamber, a supply hydraulic path supplying oil from the oil supply unit to the low pressure chamber, and a regulator controlling hydraulic pressure of the low pressure chamber.

Abstract: A continuous variable valve duration apparatus may vary an opening duration of a valve. The continuous variable valve duration apparatus may include a camshaft in which a camshaft slot is formed, a cam portion of which a cam and a cam slot are formed thereto and of which a rotation center is identical to a rotation center of the camshaft and the cam portion of which a phase angle to the cam shaft is variable, and a duration control portion which varies the phase angle between the camshaft slot and the cam slot.