Lotte Chemical Corporation

Ajou University Industry-academic Cooperation Foundation

Lg Chem, Ltd

S-precious Catalysts Inc.

Jong Yeob Jeon

Bun Yeoul Lee

Jung Jae Lee

Ji Hae Park

Dong Sik Park

Eun Yeong Hwang

Geun Ho Park

Seong Chan Eo

Young Eun Jang

Disclosed herein are a chromium compound represented by Formula 1a or 1c and a catalyst system including the same, exhibiting superior catalytic activity in an olefin trimerization reaction:[{CH(CH)CH(CHCH)CO}Cr(OH)]&#x2003;&#x2003;[Formula 1a][{CH(CH)CH(CHCH)CO}Cr(OH)].2HO.&#x2003;&#x2003;[Formula 1c]

Chromium compound, catalyst system including the same, and method for trimerizing ethylene using the catalyst system

Provided is an aliphatic polycarbonate macropolyol including &#x2014;OAO&#x2014; and Z(O&#x2014;)as repeating units. In the aliphatic polycarbonate macropolyol, the repeating units &#x2014;OAO&#x2014; and Z(O&#x2014;)are linked to each other via carbonyl (&#x2014;C(O)&#x2014;) linkers or are bonded to hydrogen to form terminal &#x2014;OH groups. The number of moles of the terminal &#x2014;OH groups is from aZ to aZ+0.2Z (where Z represents the number of moles of the repeating unit Z(O&#x2014;)). Further provided is an aliphatic polycarbonate-co-aromatic polyester macropolyol including &#x2014;OAO&#x2014; and Z(O&#x2014;)as repeating units. In the aliphatic polycarbonate-co-aromatic polyester macropolyol, the repeating units &#x2014;OAO&#x2014; and Z(O&#x2014;)are linked via carbonyl (&#x2014;C(O)&#x2014;) and &#x2014;C(O)YC(O)&#x2014; as linkers or are bonded to hydrogen to form terminal &#x2014;OH groups.

Aliphatic polycarbonate macropolyol and aliphatic polycarbonate-coaromatic polyester macropolyol

The present invention relates to an organic zinc compound comprising a styrene-based polymer or a polyolefin-polystyrene block copolymer at both ends. Also, the present invention relates to a method for preparing the organic zinc compound, the method preparing an intermediate by coordination-polymerizing an olefin monomer using a transition metal catalyst, and then performing anionic polymerization by inserting an alkyllithium compound, an amine ligand, and a styrene-based monomer into the intermediate. Accordingly, the present invention can provide a method for preparing a commercially useful styrene-based polymer or polyolefin-polystyrene block copolymer directly from an olefin monomer and a styrene monomer in a one-pot manner.

Organic zinc compound comprising polyolefin-polystyrene block copolymer, and method for preparing the same

Disclosed herein are a chromium compound represented by Formula 1a or 1b and a catalyst system including the same, exhibiting superior catalytic activity in an olefin trimerization reaction:[{CH(CH)CH(CHCH)CO}Cr(OH)]&#x2003;&#x2003;[Formula 1a][{CHCHCH(CHCH)CO}Cr(OH)].&#x2003;&#x2003;[Formula 1b]

Chromium compound, catalyst system including same, and method for trimerizing ethylene using the catalyst system

Provided is an aliphatic polycarbonate-co-aromatic polyester with long-chain branches. The copolymer includes repeating units represented by &#x2014;OAO&#x2014; and Z(O&#x2014;), which are linked via carbonyl (&#x2014;C(O)&#x2014;) and &#x2014;C(O)YC(O)&#x2014; as linkers. Also provided is an aliphatic copolycarbonate including repeating units represented by &#x2014;OAO&#x2014; and Z(O&#x2014;), which are linked via carbonyl (&#x2014;C(O)&#x2014;) linkers. The aliphatic copolycarbonate has a weight average molecular weight of 30,000 or more.

Aliphatic polycarbonate with long-chain branches and aromatic copolyester thereof

An aliphatic polycarbonate is disclosed in which a salt consisting of a metal or onium cation and an anion having a pKa not greater than 3 is dispersed. The aliphatic polycarbonate includes repeating units of Formula 1: [-A-OC(O)O-] (wherein A is a substituted or unsubstituted C-Calkylene, or a substituted or unsubstituted C-Cheteroalkylene and the O-A-O units in one polymer chain may be identical to or different from each other).

High-molecular weight aliphatic polycarbonate prepared using base catalyst

Provided is an aliphatic polycarbonate copolymer including repeating units of Formula 1 described in the specification. In Formula 1, A is a substituted or unsubstituted C-Calkylene or a substituted or unsubstituted C-Cheteroalkylene and the O-A-O units in one polymer chain may be identical to or different from each other, B is a substituted or unsubstituted C-Carylene or a substituted or unsubstituted C-Cheteroarylene and the &#x2014;C(O)&#x2014;B&#x2014;C(O)&#x2014; units in one polymer chain may be identical to or different from each other, and x and y are real numbers representing mole fractions.

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Chungcheongnam-do, South Korea

Jong Yeob Jeon