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 composition includes a 4-methyl-1-pentene-based polymer in which at least one or more temperatures showing a local maximum value of a loss tangent (tan δ) are present in a range of 10° C. or higher and 100° C. or lower, and the local maximum value of the loss tangent is 0.5 or more and 3.5 or less, and an organic compound, in which a content of the organic compound is 5 to 250 parts by mass with respect to 100 parts by mass of the 4-methyl-1-pentene-based polymer, and the organic compound has a viscosity (mPa.Math.s) in a range of 65 to 120, or a ratio between a melt flow rate (g/10 min.) of the 4-methyl-1-pentene-based copolymer and a melt flow rate (g/10 min.) of the organic compound is 1:1.0 to 0.1.

A composition includes a 4-methyl-1-pentene-based polymer in which at least one or more temperatures showing a local maximum value of a loss tangent (tan δ) are present in a range of 10° C. or higher and 100° C. or lower, and the local maximum value of the loss tangent is 0.5 or more and 3.5 or less, and an organic compound, in which a content of the organic compound is 5 to 250 parts by mass with respect to 100 parts by mass of the 4-methyl-1-pentene-based polymer, and the organic compound has a viscosity (mPa.Math.s) in a range of 65 to 120, or a ratio between a melt flow rate (g/10 min.) of the 4-methyl-1-pentene-based copolymer and a melt flow rate (g/10 min.) of the organic compound is 1:1.0 to 0.1.

A foamable composition comprising at least one cellulose acetate, a plasticizer, a nucleating agent, and either a chemical blowing agent or a physical blowing agent is disclosed. The composition is formed into foamed articles that are biodegradable.

A foamable composition comprising at least one cellulose acetate, a plasticizer, a nucleating agent, and either a chemical blowing agent or a physical blowing agent is disclosed. The composition is formed into foamed articles that are biodegradable.

Provided is a method of preparing a superabsorbent polymer, which enables preparation of the superabsorbent polymer exhibiting an improved absorption rate while maintaining excellent absorption performances by minimizing a surface damage phenomenon of the superabsorbent polymer in a pneumatic conveying process during the preparation process of the superabsorbent polymer or in a pneumatic conveying process of the finally prepared superabsorbent polymer.

A method of forming foam material is provided, which includes mixing 100 parts by weight of a compound having cyclic carbonate groups and a foaming agent to form a foaming composition, wherein the foaming agent includes 3 to 13 parts by weight of carbamate salt and 15 to 65 parts by weight of amino compound. The foaming composition is heated to 100° C. to 170° C. for decomposing the carbamate salt into CO.sub.2 and amino compound, and the amino compound is reacted with the compound having cyclic carbonate groups to form the foam material.

A method of forming foam material is provided, which includes mixing 100 parts by weight of a compound having cyclic carbonate groups and a foaming agent to form a foaming composition, wherein the foaming agent includes 3 to 13 parts by weight of carbamate salt and 15 to 65 parts by weight of amino compound. The foaming composition is heated to 100° C. to 170° C. for decomposing the carbamate salt into CO.sub.2 and amino compound, and the amino compound is reacted with the compound having cyclic carbonate groups to form the foam material.

A method of preparing super absorbent polymer includes carrying out a crosslinking polymerization of a monomer mixture comprising a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups, a forming agent, a foam-promoting agent and a silicone-based surfactant in the presence of an internal crosslinking agent to form a hydrogel polymer; drying, pulverizing and classifying the hydrogel polymer to form a base polymer powder; and further crosslinking a surface of the base polymer powder in the presence of a surface crosslinking agent to form a surface crosslinked layer. The method produces super absorbent polymer having not only an excellent absorbent capacity and an absorbency under load but also the rewetting phenomenon can be effectively prevented.

A method of preparing super absorbent polymer includes carrying out a crosslinking polymerization of a monomer mixture comprising a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups, a forming agent, a foam-promoting agent and a silicone-based surfactant in the presence of an internal crosslinking agent to form a hydrogel polymer; drying, pulverizing and classifying the hydrogel polymer to form a base polymer powder; and further crosslinking a surface of the base polymer powder in the presence of a surface crosslinking agent to form a surface crosslinked layer. The method produces super absorbent polymer having not only an excellent absorbent capacity and an absorbency under load but also the rewetting phenomenon can be effectively prevented.