In the present disclosure, there are provided a polyethylene having improved low-temperature sealing properties with an increase in the content and molecular weight of a low crystalline polymer, and a method for preparing the same.

There are provided a polyethylene capable of improving tensile strength while maintaining excellent processability and Mooney viscosity characteristics when preparing a chlorinated polyethylene compound by implementing a molecular structure having a low content of low molecular weight and a high content of high molecular weight, and a chlorinated polyethylene prepared using the same.

To provide a method for producing a styrene resin having a syndiotactic structure, including performing addition polymerization of one or more of a vinyl aromatic monomer in the presence of a catalyst containing a half metallocene transition metal compound (A) having at least one kind selected from metals of groups 3 to 5 of the periodic table and lanthanoid transition metals as a central metal, a compound (B) represented by the general formula (1), and a compound (C) selected from at least one kind of an oxygen-containing compound (c1) and a compound (c2) capable of forming an ionic complex through reaction with a transition metal compound, the styrene resin produced having a transition metal content derived from the half metallocene transition metal compound (A) of 1.5 to 12 ppm by mass.

Catalyst systems and methods for making and using the same. A method of methylating a catalyst composition while substantially normalizing the entiomeric distribution is provided. The method includes slurrying the organometallic compound in dimethoxyethane (DME), and adding a solution of RMgBr in DME, wherein R is a methyl group or a benzyl group, and wherein the RMgBr is greater than about 2.3 equivalents relative to the organometallic compound. After the addition of the RMgBr, the slurry is mixed for at least about four hours. An alkylated organometallic is isolated, wherein the methylated species has a meso/rac ratio that is between about 0.9 and about 1.2.

The present invention relates to a catalyst for olefin polymerization. Specifically, the present invention relates to a hybrid catalyst comprising different transition metal compounds and capable of preparing a polyolefin, particularly a linear low-density polyethylene, which has excellent processability, impact strength, and haze.

The present invention relates to a semi-crystalline functionalized olefin copolymer composition and a process for the preparation of a semi-crystalline functionalized olefin copolymer composition.

Provided are an ethylene polymer mixture, a method of preparing the same, and a molded article using the same. More specifically, an ethylene polymer mixture in which two ethylene polymers having different densities are mixed, a method of preparing the same, and a molded article having a low haze and a low heat sealing temperature using the ethylene polymer mixture, are provided.

Methods for preparing metallocene-based catalyst compositions include the steps of contacting an alcohol compound and an organoaluminum compound for a first period of time to form a precontacted mixture, and contacting the precontacted mixture with an activator-support and a metallocene compound for a second period of time to form the catalyst composition. Such catalyst compositions can contain an activator-support, a metallocene compound, an organoaluminum compound, and a dialkyl aluminum alkoxide, and these catalyst compositions have increased catalytic activity for the polymerization of olefins.

A door assembly. The door assembly may include at least one door panel and a door frame having a plurality of frame members including a header and a pair of side jambs. The invention may also be considered a frame member. The frame member may include a core; and a two-piece top piece adjoining the core to form a structural member. The core and the top piece may be a composite of cellulosic material and at least one other material. The door assembly may further include at least one adjacent panel. Also disclosed are door jamb frame members and mullion frame members.

The present invention relates to an ethylene and propylene ionomer and a process for the preparation of an ethylene and propylene ionomer.