The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 25, 2007
Filed:
Jul. 07, 2003
Sung-ho Chun, Daejeon, KR;
Won-kook Kim, Daejeon, KR;
Sung-cheol Yoon, Daejeon, KR;
Tae-sun Lim, Daejeon, KR;
Heon Kim, Daejeon, KR;
Kyoung-hoon Kim, Daejeon, KR;
Sung-Ho Chun, Daejeon, KR;
Won-Kook Kim, Daejeon, KR;
Sung-Cheol Yoon, Daejeon, KR;
Tae-Sun Lim, Daejeon, KR;
Heon Kim, Daejeon, KR;
Kyoung-Hoon Kim, Daejeon, KR;
LG Chem, Ltd., , KR;
Abstract
The present invention relates to a method for preparing a cyclic olefin polymer by addition polymerization, and more particularly to a method for preparing a norbornene-based addition polymer, which comprises a step of contacting a norbornene-based monomer having an ester or acetyl group with a catalyst system comprising: a Group X transition metal compound; a compound comprising a neutral Group XV electron donor ligand having a cone angle of at least 160°; and a salt capable of offering an anion that can be weakly coordinated to the transition metal, in solvent. The norbornene-based addition polymer having an ester or acetyl group according to the present invention is transparent, has superior adhesivity and a low dielectric constant, and it generates no byproducts when attached to metal. Therefore, it can be used as an optical film, a retardation film, a protection film for a polarizer, POFs (plastic optical fiber), PCBs (printed circuit board), or insulators of electronic devices.