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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.:

US 10773237 B1

PDFFull Text
Date of Patent:
Sep. 15, 2020

Filed:

Jan. 03, 2017

Method for preparing super absorbent polymer, and super absorbent polymer

Applicant:

Lg Chem, Ltd., Seoul, KR;

Inventors:

Hyung Ki Yoon, Daejeon, KR;

Dae Woo Nam, Daejeon, KR;

Hyemin Lee, Daejeon, KR;

Chang Sun Han, Daejeon, KR;

Sung Jong Seo, Daejeon, KR;

Assignee:

LG Chem, Ltd., , KR;

Attorney:

Lerner, David, Littenberg, Krumholz & Mentlik, LLP

Primary Examiner:

Tanisha Diggs

Int. Cl.
CPC ...
B01J 20/26 (2006.01); C08J 3/24 (2006.01); A61L 15/18 (2006.01); A61L 15/60 (2006.01); B01J 20/32 (2006.01); C08F 6/28 (2006.01); C08K 9/02 (2006.01); C08F 2/44 (2006.01); C08F 220/06 (2006.01); C08F 2/10 (2006.01); A61L 15/24 (2006.01); C08F 2/48 (2006.01); A61L 15/22 (2006.01); B01J 20/10 (2006.01); B01J 20/28 (2006.01); B01J 20/30 (2006.01); C08F 20/06 (2006.01);
U.S. Cl.
CPC ...
B01J 20/267 (2013.01); A61L 15/18 (2013.01); A61L 15/225 (2013.01); A61L 15/24 (2013.01); A61L 15/60 (2013.01); B01J 20/103 (2013.01); B01J 20/28016 (2013.01); B01J 20/3021 (2013.01); B01J 20/3085 (2013.01); B01J 20/321 (2013.01); B01J 20/3219 (2013.01); B01J 20/3234 (2013.01); B01J 20/3293 (2013.01); C08F 2/10 (2013.01); C08F 2/44 (2013.01); C08F 2/48 (2013.01); C08F 6/28 (2013.01); C08F 20/06 (2013.01); C08F 220/06 (2013.01); C08J 3/245 (2013.01); C08K 9/02 (2013.01); C08F 2810/20 (2013.01); C08J 2333/02 (2013.01); C08J 2333/08 (2013.01); C08K 2201/013 (2013.01); C08K 2201/014 (2013.01);
Abstract

The present invention relates to a method for preparing a super absorbent polymer exhibiting improved liquid permeability, gel strength, absorption rate and the like while maintaining excellent absorption performance. The method for preparing the super absorbent polymer comprises the steps of: carrying out a crosslinking polymerization of a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups in the presence of an internal crosslinking agent to form a hydrogel polymer including a cross-linked polymer; drying, pulverizing, and classifying the hydrogel polymer to form a base polymer powder; and surface-crosslinking the base polymer powder by using a surface crosslinking liquid containing a surface crosslinking agent of an alkylene carbonate having 2 to 5 carbon atoms, in the presence of hydrophobic silica particles having a water-contact angle of more than 10° and 150° or less and hydrophilic silica particles having a water-contact angle of 10° or less.

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