Abstract: A conventional polymerization inhibitor is for example an agent to scavenge radicals generated during storage of a radical polymerizable compound and used to stably handle the radical polymerizable compound, but is unnecessary when the radical polymerizable compound is to be subjected to radical polymerization reaction, and is preferably removed at the time of the radical polymerization reaction. The object of the present invention is to obviate inconvenience of removing the polymerization inhibitor at the time of radical polymerization. The radical polymerization control agent contained in a radical polymerizable composition of the present invention functions as a radical polymerization inhibitor for example stored in a dark place, but loses its radical polymerization inhibiting effect when polymerization is initiated while being irradiated with light at a certain specific wavelength at the time of polymerization.

Abstract: A photoradical polymerization initiator that is environmentally friendly and composed solely of carbon, hydrogen and oxygen atoms, generating no acid that may cause corrosion during a radical polymerization reaction, and having a high radical polymerization initiation capacity to light having a wavelength of 350 nm to 420 nm. A photoradical polymerizable composition including a radical polymerizable compound and a photoradical polymerization initiator, where the photoradical polymerization initiator is a 1,4-dihydroxy-2-naphthoic acid compound represented by formula (1): where R is a hydrogen atom, a C1-10 alkyl group or a C6-14 aryl group, and X is a hydrogen atom, a C1-10 alkyl group, a C6-14 aryl group, a hydroxy group, a C1-10 alkoxy group or a C6-14 aryloxy group.

Abstract: The purpose of the present invention is to provide a photopolymerizable composition which can act as a photopolymerization sensitizer that is active against light having a wavelength falling within a wavelength range of from 300 to 500 nm, and which has such a property that coloring of a cured product produced by polymerizing a photopolymerizable composition containing the photopolymerization sensitizer is less. A photopolymerization sensitizer composition characterized by comprising a photopolymerization sensitizer containing an alkoxyanthracene compound represented by the formula (1) and a singlet oxygen quencher; and a photopolymerizable composition containing the photopolymerization sensitizer composition: in the formula (1), n represents an integer of 1 or 2; R represents a C1-12 alkyl group; and X represents a hydrogen atom or a C1-8 alkyl group.

Abstract: A radical polymerization method may use a compound having a polycyclic aromatic skeleton and an endoperoxide compound having a polycyclic aromatic skeleton. An endoperoxide compound may have a polycyclic aromatic skeleton of formula (1), and a compound may have a polycyclic aromatic skeleton, which is a raw material of the endoperoxide compound: wherein R is a C1-10 alkyl group, an alkoxymethyl group having a C1-5 alkoxy group, a C6-10 aryl group, an alkylcarbonyl group having a C1-10 alkyl group, an arylcarbonyl group having a C6-20 aryl group, an alkyloxycarbonyl group having a C1-10 alkyl group, an aryloxycarbonyl group having a C6-10 aryl group, an alkyloxycarbonylmethyl group having a C1-12 alkyl group or an aryloxycarbonylmethyl group having a C6-12 aryl group.

Abstract: A conventional polymerization inhibitor is for example an agent to scavenge radicals generated during storage of a radical polymerizable compound and used to stably handle the radical polymerizable compound, but is unnecessary when the radical polymerizable compound is to be subjected to radical polymerization reaction, and is preferably removed at the time of the radical polymerization reaction. The object of the present invention is to obviate inconvenience of removing the polymerization inhibitor at the time of radical polymerization. The radical polymerization control agent contained in a radical polymerizable composition of the present invention functions as a radical polymerization inhibitor for example stored in a dark place, but loses its radical polymerization inhibiting effect when polymerization is initiated while being irradiated with light at a certain specific wavelength at the time of polymerization.

Abstract: [OBJECT] The purpose of the present invention is to provide a photopolymerizable composition which can act as a photopolymerization sensitizer that is active against light having a wavelength falling within a wavelength range of from 300 to 500 nm, and which has such a property that coloring of a cured product produced by polymerizing a photopolymerizable composition containing the photopolymerization sensitizer is less. [SOLUTION TO PROBLEM] A photopolymerization sensitizer composition characterized by comprising a photopolymerization sensitizer containing an alkoxyanthracene compound represented by the formula (1) and a singlet oxygen quencher; and a photopolymerizable composition containing the photopolymerization sensitizer composition: in the formula (1), n represents an integer of 1 or 2; R represents a C1-12 alkyl group; and X represents a hydrogen atom or a C1-8 alkyl group.

Abstract: An absorbent composite comprising a bound particulate absorbent polymer in which two or more nearly spherical absorbent polymer particles are bound to each other and a web-like absorbent polymer, wherein the bound particulate absorbent polymer and the web-like absorbent polymer are bound to a substrate. The composite has a large absorption and a high absorbing speed in which the absorbent polymer is kept uniformly dispersed on the support throughout before and after absorption.

Abstract: In a method of redox polymerization of monomer by the use of a non-metal reducing agent and a non-metal oxidizing agent, a transition metal compound is used in addition to the reducing agent and the oxidizing agent in an amount of from 0.01 to 100 ppm by weight in terms of the metal thereof relative to the monomer, whereby the polymerization speed is significantly increased. Using this, water-absorbent resin composite and an absorbent article can be produced.

Abstract: Disclosed is a water-absorbent polymer composite and composition thereof comprising a water-absorbent polymer particle and two or more fibers, wherein said polymer particle has a substantially spherical shape, at least one of said two or more fibers is partially wrapped in the polymer particle and partially exposed to outside the particle, and at least one of said two or more fibers is unwrapped in the polymer particle and partially adhered to a surface of the polymer particle. This water-absorbent polymer composite is characterized in that the fibers are stably fixed to the water-absorbent polymer not only in dry but also in wet through water absorption for swelling, the water-absorbent polymer content can be enlarged relative to the fibers, the polymer can be uniformly fixed to the fibers, the composite is flexible and can be thinned, opened and mixed with any other material uniformly.

Abstract: Disclosed is a method for preparing a water-absorbent polymer composite comprising the steps of contacting a droplet containing a solvent and said polymerizable monomer before polymerization and/or under polymerization with first fibers fed through a first supply port of said reactor in a gas phase, proceeding with polymerization of said polymerizable monomer, contacting the resultant droplet containing said solvent, the polymerizable monomer under polymerization and said first fibers with second fibers fed through a second supply port of said reactor in a gas phase, and proceeding with further polymerization of said polymerizable monomer to form said water-absorbent polymer composite.

Abstract: A polymerization method in which a first liquid and a second liquid are mixed in a gas phase and polymerized in the form of droplets is disclosed, wherein a polymerizable monomer and a polymerization initiator are each contained in at least one of the first liquid and the second liquid, and at least one of the first liquid and the second liquid is injected in a spatially expanding film shape. By employing the polymerization method of this invention, high-quality polymer can be efficiently produced in large quantity by the droplet polymerization even using a polymerizable monomer with a rapid reaction rate.

Abstract: In a method of redox polymerization of monomer by the use of a non-metal reducing agent and a non-metal oxidizing agent, a transition metal compound is used in addition to the reducing agent and the oxidizing agent in an amount of from 0.01 to 100 ppm by weight in terms of the metal thereof relative to the monomer, whereby the polymerization speed is significantly increased. Using this, water-absorbent resin composite and an absorbent article can be produced.

Abstract: An absorbent article containing a water-absorbent resin composite comprising one nearly spherical water-absorbent resin particle and two or more fibers, wherein one or more of the fibers are partially embedded in the resin particle and are partially exposed from the resin particle, and wherein one or more of the fibers are never embedded in the resin particle but partially adhere to the surface of the resin particle. In the absorbent article, the water-absorbent resin particle is uniformly fixed on the fiber before, during and after water absorption, so that the water-absorbent resin can exist at a higher ratio to the fiber. Thus, the absorbent article characteristically has great softness and high shape stability.

Abstract: A method comprising bringing droplets of an aqueous solution of a polymerizable monomer into contact with a fibrous substrate with polymerizing the monomer to thereby fix a water-absorbing resin particle precursor to the fibrous substrate, then adding thereto an aqueous solution of a crosslinking agent in such a manner that the temperature of the water-absorbing resin particle precursor is 60° C. or lower after the addition, and heating the precursor composite in an atmosphere at 90° C. or higher within 2 minutes after the addition to thereby crosslink the precursor. This method can provide a water-absorbing composite having a sufficient water-absorbing capacity under pressure and an excellent water-holding capacity.

Abstract: Disclosed is a water-absorbent polymer composite and composition thereof comprising a water-absorbent polymer particle and two or more fibers, wherein said polymer particle has a substantially spherical shape, at least one of said two or more fibers is partially wrapped in the polymer particle and partially exposed to outside the particle, and at least one of said two or more fibers is unwrapped in the polymer particle and partially adhered to a surface of the polymer particle. This water-absorbent polymer composite is characterized in that the fibers are stably fixed to the water-absorbent polymer not only in dry but also in wet through water absorption for swelling, the water-absorbent polymer content can be enlarged relative to the fibers, the polymer can be uniformly fixed to the fibers, the composite is flexible and can be thinned, opened and mixed with any other material uniformly.

Abstract: Disclosed is a method for preparing a water-absorbent polymer composite comprising the steps of contacting a droplet containing a solvent and said polymerizable monomer before polymerization and/or under polymerization with first fibers fed through a first supply port of said reactor in a gas phase, proceeding with polymerization of said polymerizable monomer, contacting the resultant droplet containing said solvent, the polymerizable monomer under polymerization and said first fibers with second fibers fed through a second supply port of said reactor in a gas phase, and proceeding with further polymerization of said polymerizable monomer to form said water-absorbent polymer composite.

Abstract: Disclosed is a method for preparing a water-absorbent polymer composite comprising the steps of contacting said polymerizable monomer with one or more fibers having a contact angle against water of 0 to 60 degrees in a gas phase, and proceeding with the polymerization of said monomers to form the water-absorbent polymer composite. The method can provide a water-absorbent polymer composite characterized in that the fibers are stably fixed to the water-absorbent polymer not only in dry but also in wet through water absorption for swelling, the water-absorbent polymer content can be enlarged relative to the fibers, the polymer can be uniformly fixed to the fibers, the composite is flexible and can be thinned, and it can be opened by itself and can be uniformly mixed with any other material.

Abstract: A polymerization method in which a first liquid and a second liquid are mixed in a gas phase and polymerized in the form of droplets is disclosed, wherein a polymerizable monomer and a polymerization initiator are each contained in at least one of the first liquid and the second liquid, and at least one of the first liquid and the second liquid is injected in a spatially expanding film shape. By employing the polymerization method of this invention, high-quality polymer can be efficiently produced in large quantity by the droplet polymerization even using a polymerizable monomer with a rapid reaction rate.

Abstract: Process for preparing a graft copolymer having a high graft copolymer fraction which comprises subjecting a monomer to a polymerization initiation condition resulting from the reaction of a halogen-containing polymer with a combination of a reducing agent and a phase transfer catalyst such as an onium compound thereby to polymerize said monomer.

Abstract: An acrylate is polymerized by the photo-decomposition of ##STR1## to make a polymeric intermediate containing dithiocarbamate groups at both its ends, and a hard polymer-forming monomer is polymerized by the photo-decomposition of this dithiocarbamate group-containing polymeric intermediate to form blocks of a polymer of said hard polymer-forming monomer on both sides of said polymeric intermediate, thereby forming an ABA type block copolymer.