The invention relates to aqueous polymer dispersions comprising polymerized units issued from the following monomers with related weight proportions based on 100 parts of weight of a)+b): a) 50 to 90% of a monoethylenically unsaturated non-ionic monomer, b) 10 to 50% of vinyl aromatic monomer or methyl methacrylate, c) 1 to 5% of a hydroxy-containing (meth)acrylate, d) 0.1 to 3% of acid monomer selected from d1) acid monomer selected from monocarboxylic or dicarboxylic acid monomers and d2) acid monomer selected from phosphorous-based or sulfur-based strong acid monomers or/and their salts, or from the mixtures of d1) and d2), e) 0.001 to 0.5% of chain transfer agent, and f) 0 to 1% one of internal crosslinker bearing at least two copolymerisable ethylenic unsaturations, the polymer having a Tg measured by DSC from 30 to 0 C. and a gel content of 0 to 60%, formed during polymerization.

A radiation-curing ink jet ink composition includes a urethane (meth)acrylate including one (meth)acryloyl group, the amount of the urethane (meth)acrylate being 5.0% by mass or more and 30.0% by mass or less of the total amount of the ink composition, and a (meth)acrylate including an aromatic ring and one (meth)acryloyl group, the amount of the (meth)acrylate being 4.0% by mass or more and 50.0% by mass or less of the total amount of the ink composition.

A radiation-curing ink jet ink composition includes a urethane (meth)acrylate including one (meth)acryloyl group, the amount of the urethane (meth)acrylate being 5.0% by mass or more and 30.0% by mass or less of the total amount of the ink composition, and a (meth)acrylate including an aromatic ring and one (meth)acryloyl group, the amount of the (meth)acrylate being 4.0% by mass or more and 50.0% by mass or less of the total amount of the ink composition.

The present invention relates to a super absorbent polymer and a method for preparing the same. According to the super absorbent polymer and the method for preparing a super absorbent polymer of the present invention, a laponite is contained in a colloidal solution state during polymerization of the monomer composition, and thus achieves an appropriate crosslinking density, thereby contributing to improvement of various physical properties such as a gel strength and a centrifuge retention capacity of the super absorbent polymer.

The present invention relates to a super absorbent polymer and a method for preparing the same. According to the super absorbent polymer and the method for preparing a super absorbent polymer of the present invention, a laponite is contained in a colloidal solution state during polymerization of the monomer composition, and thus achieves an appropriate crosslinking density, thereby contributing to improvement of various physical properties such as a gel strength and a centrifuge retention capacity of the super absorbent polymer.

The present invention provides a non-solvent dental adhesive composition exhibiting high initial bond strength and high bond durability to a tooth structure (wet matter) and a high dentin cohesive failure rate on a tooth structure (wet matter) and being substantially free of water and an organic solvent. The present invention relates to a non-solvent dental adhesive composition comprising: an acid group-containing polymerizable monomer (A); a hydrophobic polymerizable monomer (B) having no acid group; and a water-soluble photopolymerization initiator (C) having a solubility of 10 g/L or more in water at 25 C.

The present invention provides a non-solvent dental adhesive composition exhibiting high initial bond strength and high bond durability to a tooth structure (wet matter) and a high dentin cohesive failure rate on a tooth structure (wet matter) and being substantially free of water and an organic solvent. The present invention relates to a non-solvent dental adhesive composition comprising: an acid group-containing polymerizable monomer (A); a hydrophobic polymerizable monomer (B) having no acid group; and a water-soluble photopolymerization initiator (C) having a solubility of 10 g/L or more in water at 25 C.

A photosensitive resin composition comprising a polymer containing a silphenylene skeleton and a fluorene skeleton and having a crosslinkable site in the molecule, a phenol compound having a Mw of 300-10,000, a photoacid generator, and a benzotriazole or imidazole compound has improved film properties. Even from a thick film, a fine size pattern can be formed.

A photosensitive resin composition comprising a polymer containing a silphenylene skeleton and a fluorene skeleton and having a crosslinkable site in the molecule, a phenol compound having a Mw of 300-10,000, a photoacid generator, and a benzotriazole or imidazole compound has improved film properties. Even from a thick film, a fine size pattern can be formed.

The present invention relates to an adhesive sheet. The adhesive sheet according to the present invention utilizes an acrylic resin composition without using a separate primer layer. As a result, the present invention can provide excellent adhesion, high reliability due to its excellent light resistance under the sunlight exposure, and excellent elastic modulus. Therefore, it can be easily used as an adhesive material in various fields such as building materials and automobiles.