The present invention relates to a superabsorbent polymer having an improved adsorption rate and a high bulk density, and a preparation method thereof.

Covalently cross-linked copolymers are described herein. More specifically, polysaccharide-polyamine copolymeric matrices or structures and cationic copolymeric matrices are described herein. The polysaccharide-polyamine copolymers, when protonated, can form cationic copolymeric matrices having exceptionally high densities of cationic sites. In one form, the covalently cross-linked copolymers provide a three-dimensional structure, especially when hydrated.

Disclosed is a pharmaceutical composition for treating hypercholesterolemia. The pharmaceutical composition includes a polysaccharide-polyamine copolymer and a pharmaceutically acceptable salt thereof as active ingredients. The polysaccharide-polyamine copolymer is formed by copolymerization of the following two parts: a selectively oxidized polysaccharide with 2,3-dialdehyde, and a polyamine with an amino functional group; the polyamine with an amino functional group and the selectively oxidized polysaccharide with 2,3-dialdehyde can form a net structure by means of covalent crosslinking, resulting in a hydrogel with an amino functional group or a granular polysaccharide-polyamine copolymer, wherein the amino functional group in the hydrogel with an amino functional group or the granular polysaccharide-polyamine copolymer can be protonated so as to form a cationic copolymer of a three-dimensional network structure having a protonated site, and the nitrogen content of the cationic copolymer and the nitrogen content of the polysaccharide-polyamine copolymer are above 12.3 wt %, and both the cationic copolymer and the polysaccharide-polyamine copolymer are water-insoluble.

The present invention relates to superabsorbent polymer and a method for preparing the same. The present invention can provide a superabsorbent polymer in which a hydrophobic material having an HLB of 0-6 and a surface cross-linking agent are mixed into a base resin prepared in the presence of water dispersible silica, thereby having improved rewetting characteristics and permeability through surface-modification of the base resin.

A method of preparing a superabsorbent polymer sheet by polymerization of monomers in the presence of an encapsulated foaming agent and an inorganic foaming agent is provided. According to the method of preparing the superabsorbent polymer sheet of the present invention, a porous and flexible superabsorbent polymer sheet may be prepared.

The invention relates to novel a high-volume swelling hydrogel which comprises a plurality of pores which are defined by an interpenetrating network, and/or a semi-interpenetrating network and/or simple cross-linked arrangement of a plurality of one or more species of hydrophilic polymers, optionally together with one or more biocompatible polymers and optionally together with one or more plasticising agents, characterised in that at least some of the pores are at least partially collapsed and/or flattened, and further characterised in that the interpenetrating network and/or semi-interpenetrating network and/or cross-linked arrangement which defines the collapsed and/or flattened pores is substantially unbroken. The invention also relates to a process for preparing such hydrogels, and to their use as an appetite suppressant.

The present invention relates to a super absorbent polymer. The super absorbent polymer exhibits excellent initial absorption capacity, and thus can provide a sanitary material such as a diaper or a sanitary napkin which can quickly absorb body fluids and impart a dry and soft touch feeling.

The present invention relates to a super absorbent resin, and the super absorbent resin can exhibit a fast absorption rate and high gel strength even in a partially swollen state through the size optimization of partially swollen gel particles. Therefore, the use of the super absorbent resin can effectively prevent a rewetting phenomenon.

The invention relates to a method for depositing nano-objects on the surface of a gel comprising the steps of: a) providing a gel having a polymer matrix and a solvent within the polymer matrix, the polymer matrix forming a three-dimensional network which is capable of swelling in the presence of the solvent, wherein the solubility of the polymer matrix in the solvent at 1 bar and 25 C. is less than 1 g/l, wherein the gel has a rigidity gradient on the micrometer scale of less than 10%, then b) depositing nano-objects on the surface of the gel, the nano-objects having a mean diameter greater than or equal to the mean diameter of the pores of the gel, then c) evaporating the solvent from the gel at least until the content of solvent no longer varies over time, under the proviso that, at the start of evaporation, the content of mineral salts in the solvent is less than 6 g/l, the gel capable of being obtained and the uses thereof.

The invention concerns a method for depositing nano-objects on the surface of a gel comprising a polymer matrix having at least two contiguous zones of distinct rigidities, said method comprising the steps of: a) providing a gel comprising a polymer matrix and a solvent within the polymer matrix, the polymer matrix forming a three-dimensional array capable of swelling in the presence of said solvent, wherein the solubility of the polymer matrix, at 1 bar and 25 C., in the solvent is less than 1 g/L, the polymer matrix comprising at least two contiguous zones of distinct rigidities having a rigidity gradient greater than or equal to 0.1 kPa/m, then b) depositing nano-objects on the surface of the gel, then c) evaporating the solvent from the gel at least until the variation of the rate of evaporation of the solvent from the at least one least rigid zone of the gel is not constant over time, by which the nano-objects migrate towards the at least one most rigid zone of the gel and a gel is obtained for which the surface is at least partially coated with nano-objects, and wherein the density per unit area of nano-objects of the at least one most-rigid zone among the at least two contiguous zones is greater than that of the at least one least-rigid zone among the at least two contiguous zones, the gel that can be obtained and its applications.