A method of preparing a superabsorbent polymer is provided. The method of preparing the superabsorbent polymer according to the present disclosure is able to provide the superabsorbent polymer having an improved absorption rate while having superior centrifuge retention capacity (CRC) and absorbency under pressure (AUP).

A photocurable polymer composition for use with a three dimensional printing process and a method of manufacture of such composition. The composition includes a photocurable resin and a filler and can be tunable to a desired dielectric constant. The filler comprises about 0 to about 30 weight percent of the composition.

An object of the present invention is to provide a novel electro-optic polymer. Another object of the present invention is to provide a novel electro-optic polymer with a low alicyclic methacrylate monomer content. The polymer according to the present invention is a polymer comprising (a) a base polymer having a reactive group (A), (b) an electro-optic molecule having a plurality of reactive groups (B), and a bond (C) formed by reaction of the reactive group (A) with the plurality of reactive groups (B), the bond (C) being at least one type of bond selected from the group consisting of a (thio)ester bond, a (thio)urethane bond, a (thio)urea bond and a (thio)amide bond.

An object of the present invention is to provide a novel electro-optic polymer. Another object of the present invention is to provide a novel electro-optic polymer with a low alicyclic methacrylate monomer content. The polymer according to the present invention is a polymer comprising (a) a base polymer having a reactive group (A), (b) an electro-optic molecule having a plurality of reactive groups (B), and a bond (C) formed by reaction of the reactive group (A) with the plurality of reactive groups (B), the bond (C) being at least one type of bond selected from the group consisting of a (thio)ester bond, a (thio)urethane bond, a (thio)urea bond and a (thio)amide bond.

A method of preparing a superabsorbent polymer is provided, which is able to improve physical properties and to recycle fine powder generated during the preparation process. Particularly, a method of preparing a superabsorbent polymer capable of improving physical properties by using a base resin including a water-containing gel polymer and a base-treated fine powder regranulated body, which are different from each other in degree of neutralization, during preparation of the superabsorbent polymer, is provided.

A method of preparing a superabsorbent polymer is provided, which is able to improve physical properties and to recycle fine powder generated during the preparation process. Particularly, a method of preparing a superabsorbent polymer capable of improving physical properties by using a base resin including a water-containing gel polymer and a base-treated fine powder regranulated body, which are different from each other in degree of neutralization, during preparation of the superabsorbent polymer, is provided.

Provided are a solventless composition and a method of preparing the same. Here, the solventless composition may effectively manufacture a film that is uniform without substantial deviation in thickness and has a large but uniform thickness or an excellent physical property such as thermal resistance during manufacture of a film. In addition, the composition of the present invention does not induce contamination during the manufacture of the film. Furthermore, by preventing gelation or phase separation of components of the composition, the composition capable of manufacturing a substrate film having an excellent physical property such as optical transparency, thermal resistance and dimension stability may be provided.

Provided are a solventless composition and a method of preparing the same. Here, the solventless composition may effectively manufacture a film that is uniform without substantial deviation in thickness and has a large but uniform thickness or an excellent physical property such as thermal resistance during manufacture of a film. In addition, the composition of the present invention does not induce contamination during the manufacture of the film. Furthermore, by preventing gelation or phase separation of components of the composition, the composition capable of manufacturing a substrate film having an excellent physical property such as optical transparency, thermal resistance and dimension stability may be provided.

Provided are a rubber composition having a good balance of improved fuel efficiency, abrasion resistance, and wet grip performance while providing good processability, and a pneumatic tire having a tread manufactured from the rubber composition. A rubber composition comprising: a copolymer synthesized by copolymerization of a conjugated diene monomer and an unsaturated acyclic monoester represented by the formula (1) below; and carbon black and/or silica, ##STR00001##
wherein R.sup.1 represents hydrogen or a C1-C30 hydrocarbon group, and R.sup.2 represents hydrogen or a C1-C30 hydrocarbon group.

The present invention provides a novel method for producing an ester group-containing compound and a derivative produced using the compound as a synthetic intermediate. The invention also provides a polymerizable composition containing the compound obtained by the production method and a film-shaped polymer obtained by polymerizing the polymerizable composition. The present invention is a method for producing an ester group-containing compound, the method including a mixing step of mixing a condensing agent, a Bronsted acid, a carboxylic acid, and a phenol or an alcohol to prepare a reaction mixture. The Bronsted acid selected is other than the condensing agent, the carboxylic acid, and the phenol.