Patent ID: 11857946
Assignee: LG CHEM, LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC B  C  A | IPC B

Claim 0:
1. A preparing method of a super absorbent polymer sheet, comprising:
preparing a monomer composition comprising an acrylic acid-based monomer having at least partially neutralized acidic groups, a comonomer containing polyethylene glycol (methyl ether) (meth)acrylate, an internal cross-linking agent containing a polyol, an encapsulated blowing agent, and a polymerization initiator;
preparing a hydrogel polymer by thermal polymerization or photopolymerization of the monomer composition; and
drying the hydrogel polymer to form a super absorbent polymer sheet,
wherein the encapsulated blowing agent is present in an encapsulated state during the preparing the monomer composition and during the thermal polymerization or the photopolymerization, and is expanded during the drying the hydrogel polymer.