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:
May. 12, 2015
Filed:
Nov. 28, 2011
Tae-young Won, Daejeon, KR;
Chang-sun Han, Daejeon, KR;
Gi-cheul Kim, Daejeon, KR;
Sang-gi Lee, Daejeon, KR;
Kyu-pal Kim, Yeosu-si, KR;
Sung-soo Park, Seoul, KR;
Gyu Leem, Daejeon, KR;
Tae-Young Won, Daejeon, KR;
Chang-Sun Han, Daejeon, KR;
Gi-Cheul Kim, Daejeon, KR;
Sang-Gi Lee, Daejeon, KR;
Kyu-Pal Kim, Yeosu-si, KR;
Sung-Soo Park, Seoul, KR;
Gyu Leem, Daejeon, KR;
LG Chem, Ltd., Seoul, KR;
Abstract
The present invention relates to a preparation method of a superabsorbent polymer, and specifically to a method of preparing a superabsorbent polymer including the steps of: preparing a hydrous gel phase polymer by thermal polymerizing or photo-polymerizing a monomer composition including a water-soluble ethylene-based unsaturated monomer and a polymerization initiator; drying the hydrous gel phase polymer; milling the dried polymer; classifying the milled hydrous gel phase polymer into two or more grades by particle size; adding a surface cross-linking agent to each hydrous gel phase polymer classified into two or more grades; and carrying out a surface cross-linking reaction of the hydrous gel phase polymer to which the surface cross-linking agent is added.