Abstract: Disclosed is a metallocene catalyst composition for polyolefin polymerization. The metallocene catalyst composition is in a non-supported, heterogeneous form where an ansa-metallocene is bound to a cocatalyst without a support. Also, a method for preparing the catalyst composition, and a method for preparing polyolefin using the catalyst are disclosed. Capable of readily controlling microstructures of olefin polymers in addition to having high catalytic activity, the non-supported heterogeneous catalyst composition can be applied to the preparation of polyolefin polymers at high yield without altering preexisting processes.

Abstract: The present invention relates to a method for preparing a supported metallocene catalyst, and a method for preparing polyolefin using the same, in which the supported metallocene catalyst prepared from the simple process according to the method for preparing the supported metallocene catalyst of the present invention can apply to the polymerization of the polyolefin that is polymerized at low pressure or high pressure; the molecular weight distribution of polyolefin prepared can be easily controlled; and there are effects such that its catalyst activity is significantly higher than that of the existed supported metallocene catalyst, and the molecular weight distribution can be easily controlled.

Abstract: The present invention relates to a method for preparing a supported metallocene catalyst, and a method for preparing polyolefin using the same, in which the supported metallocene catalyst prepared from the simple process according to the method for preparing the supported metallocene catalyst of the present invention can apply to the polymerization of the polyolefin that is polymerized at low pressure or high pressure; the molecular weight distribution of polyolefin prepared can be easily controlled; and there are effects such that its catalyst activity is significantly higher than that of the existed supported metallocene catalyst, and the molecular weight distribution can be easily controlled.

Abstract: Provided are a supported metallocene catalyst, a method for preparing the same and a method for preparing polyolefin using the same. The supported metallocene catalyst prepared by incorporating a metallocene compound having a ligand substituted with alkoxide or aryloxide into a conventional supported metallocene catalyst and incorporating a borate compound as a second co-catalyst exhibits considerably superior catalyst activity and easily controls molecular weight distribution, as compared to the conventional metallocene-supported catalyst.

Abstract: By adapting an apparatus and method for managing memos to a video processing apparatus, memo data relating to meetings and events are input and stored, and then reported to the user around the designated day recorded in the memo data.

Abstract: A reserved recording method and apparatus performs reserved recording based upon the contents of programs. When program information is reserved, a block number denoting the class of the program is stored in a memory. Then, after receiving current time information through a timer, when the current time is the pre-programmed recording time, the initial program is recorded and the existence of program information having the same block number is checked. If a program of the same block number exists, the pre-programmed time of this program is compared with those of programs having other block numbers, so that a fast-forward operation is performed for as long as the predetermined tape length of the program of the same block number when a program of another block number is earlier. Then, a program of another block number is recorded at the corresponding pre-programmed time.