Abstract: Provided is a method for producing a polysuccinimide that can simply produce a high molecular weight polysuccinimide. The method for producing a polysuccinimide is a method for producing a polysuccinimide in which a second polysuccinimide is produced using a polysuccinimide composition containing a first polysuccinimide. The method includes: performing a chain elongation reaction of the first polysuccinimide to obtain the second polysuccinimide. The first polysuccinimide has a weight average molecular weight (Mw) falling within a range of 25,000 to 50,000. The polysuccinimide composition contains dicarboxylic acid at a ratio of 1.5 mol % to 4 mol %.

Abstract: An electronic device housing includes: a case having a bottom-surface portion and side-surface portions; and a cover covering an opening enclosed by the side-surface portions. At positions along each of at least two opposing side lines of the cover, two flexible arm portions are provided so as to extend toward the bottom-surface portion, and two protrusions are provided between the two arm portions so as to protrude and are held between the two arm portions. Contact parts of either the arm portions or the protrusions have curved-surface portions, and contact parts of others have flat-surface portions. Two of the flat-surface portions provided on a side of each side line of the cover where the two arm portions are provided are inclined such that an interval between the flat-surface portions is narrowed toward the bottom-surface portion. The arm portions bend while pressing the protrusions at positions contacting with the protrusions.

Abstract: Provided are a block copolymer having a narrow molecular weight distribution such that the copolymer can be used in a DSA technique, a block copolymer intermediate thereof, and methods for producing the same. A block copolymer intermediate represented by the general formula (1) or (2): wherein, in the formulae (1) and (2), each of R1 and R3 independently represents a polymerization initiator residue, each of R2 and R4 independently represents an aromatic group or an alkyl group, Y1 represents a polymer block of (a)an (meth)acrylic acid ester, Y2 represents a polymer block of styrene or a derivative thereof, L represents an alkylene group or a phenylene group, X represents a halogen group, and each of m and n independently represents an integer of 1 to 5.

Abstract: The block copolymer intermediate represented by the following general formula (1) or (2) is used. In the formulae, R1 and R7 each independently represent a polymerization initiator residue, R2 and R8 each independently represent an aromatic group or an alkyl group, Y1 represents a polymer block of (meth)acrylic ester: Y2 represents a polymer block of styrene or a derivative thereof, and m and n each independently represent in an integer from 1 to 5. In the formulae, R3 represents an alkylene group having 1 to 6 carbon atoms, L represents a linking group, R4 represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an aromatic group, and R5 and R6 each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

Abstract: A hollow nano-particle includes a shell layer containing a block copolymer having a hydrophobic organic chain and a polyamine chain, and silica. A hollow silica nano-particle has a porosity of 20% by volume or more and 70% by volume or less, and a thickness of a shell layer containing silica of 3 nm or more and 100 nm or less. A production method for the hollow nano-particle includes: a step of dropping an aqueous solvent while stirring an organic solvent in which a block copolymer having a hydrophobic organic chain and a polyamine chain is dissolved, to obtain a dispersion liquid of vesicles containing the block copolymer; and a step of adding a silica source to the dispersion liquid of vesicles, carrying out a sol-gel reaction of the silica source using the vesicle as a template, and precipitating silica to obtain the hollow nano-particle.

Abstract: Provided are a block copolymer having a narrow molecular weight distribution such that the copolymer can be used in a DSA technique, a block copolymer intermediate thereof, and methods for producing the same. A block copolymer intermediate represented by the general formula (1) or (2) is used: wherein, in the general formulae (1) and (2), each of R1 and R3 independently represents a polymerization initiator residue, each of R2 and R4 independently represents an aromatic group or an alkyl group, Y1 represents a polymer block of (a)an (meth)acrylic acid ester, Y2 represents a polymer block of styrene or a derivative thereof, L represents an alkylene group having 1 to 6 carbon atoms, X represents a halogen atom, and each of m and n independently represents an integer of 1 to 5.

Abstract: Provided are a block copolymer having a narrow molecular weight distribution such that the copolymer can be used in a DSA technique, a block copolymer intermediate thereof, and methods for producing the same. A block copolymer intermediate represented by the general formula (1) or (2): wherein, in the formulae (1) and (2), each of R1 and R3 independently represents a polymerization initiator residue, each of R2 and R4 independently represents an aromatic group or an alkyl group, Y1 represents a polymer block of (a)an (meth)acrylic acid ester, Y2 represents a polymer block of styrene or a derivative thereof, L represents an alkylene group or a phenylene group, X represents a halogen group, and each of m and n independently represents an integer of 1 to 5.

Abstract: There is provided a pigment dispersant that is a block polymer P in which a hydrophobic polymer block A and a hydrophilic polymer block B containing an anionic group are linked to each other. The block polymer P has a number average molecular weight ranging from 1000 to 4000; and where the block polymer P is subjected to 100% neutralization of the anionic group with a basic compound and dispersed in water and where the fine particles of the dispersed block polymer P are subjected to measurement of a scattering profile by small- or ultra-small-angle X-ray scattering that involves use of synchrotron radiation, at least one minimum value in the scattering profile is present within the range of a scattering vector q from 0.1 to 1 nm?1. There is also provided an aqueous pigment dispersion containing the pigment dispersant, a pigment, a basic compound, and an aqueous medium.

Abstract: Provided is a printing agent including a pigment, a pigment dispersant, water, an organic solvent, and a binder resin, the pigment dispersant being a polymer (A) including an anionic group, the polymer (A) having a solubility in water of 0.1 g/100 ml or less, a number-average molecular weight of 1000 to 6000, and an acid value of 40 to 400 mgKOH/g. Also provided is a printed fabric produced by applying the printing agent on a fabric. The polymer (A) is preferably a polymer represented by General Formula (1) (where A1 represents a residue of an organolithium initiator; A2 represents a polymer block including a monomer having an aromatic ring or a heterocyclic ring; A3 represents a polymer block including an anionic group; n represents an integer of 1 to 5; and B represents an aromatic group or an alkyl group).

Abstract: A water-based ink for inkjet recording contains a pigment, water, organic solvents, at least one compound selected from urea compounds, and a binder resin. The organic solvents include at least (1) a water-soluble organic solvent having a boiling point of from 100° C. to 200° C. inclusive and a vapor pressure at 20° C. of 0.5 hPa or more, (2) propylene glycol, and (3) glycerin, diglycerin, and/or a derivative thereof serving as an organic solvent. Preferably, the water-based ink further contains a polymer (A) serving as a pigment dispersant. The polymer (A) has an anionic group and has a solubility in water of 0.1 g/100 mL or more, a number average molecular weight within the range of 1,000 to 6,000, and an acid value within the range of 40 to 190 mg KOH/g.

Abstract: The present invention provides a method for producing a block copolymer, which includes subjecting styrene or a derivative thereof (excluding ?-methylstyrene) to living anionic polymerization in the presence of a polymerization initiator by means of a microreactor having a channel being capable of mixing a plurality of liquids with each other, reacting a propagation end of the resultant polymer block (A) derived from styrene or a derivative thereof with ?-methylstyrene to obtain an intermediate polymer having a polymer unit (B) derived from ?-methylstyrene bonded to one end of the polymer block (A), and then subjecting a (meth)acrylate compound (c) to living anionic polymerization in the presence of a polymerization initiator so that the polymer unit (B) derived from ?-methyl styrene in the intermediate polymer serves as a propagation end to form a polymer block (C) derived from the (meth)acrylate compound (c).

Abstract: Disclosed are an aqueous pigment dispersion and an aqueous ink for inkjet recording each of which includes a polymer (A), a pigment, and water. The polymer (A) has an anionic group, has a solubility in water of 0.1 g/100 mL or less and a number average molecular weight within the range of 1,000 to 6,000, and forms fine particles in water when the degree of neutralization of the anionic groups with the basic compound is 100%. Preferably, the polymer (A) is a polymer represented by general formula (1) (in formula (1), A1 represents an organic lithium initiator residue, A2 represents a polymer block of a monomer having an aromatic ring or a heterocycle, A3 is a polymer block containing an anionic group, n represents an integer of 1 to 5, and B represents an aromatic group or an alkyl group).

Abstract: Provided is a printing agent including a pigment, a pigment dispersant, water, an organic solvent, and a binder resin, the pigment dispersant being a polymer (A) including an anionic group, the polymer (A) having a solubility in water of 0.1 g/100 ml or less, a number-average molecular weight of 1000 to 6000, and an acid value of 40 to 400 mgKOH/g. Also provided is a printed fabric produced by applying the printing agent on a fabric. The polymer (A) is preferably a polymer represented by General Formula (1) (where A1 represents a residue of an organolithium initiator; A2 represents a polymer block including a monomer having an aromatic ring or a heterocyclic ring; A3 represents a polymer block including an anionic group; n represents an integer of 1 to 5; and B represents an aromatic group or an alkyl group).

Abstract: A water-based ink for inkjet recording contains a pigment, water, organic solvents, at least one compound selected from urea compounds, and a binder resin. The organic solvents include at least (1) a water-soluble organic solvent having a boiling point of from 100° C. to 200° C. inclusive and a vapor pressure at 20° C. of 0.5 hPa or more, (2) propylene glycol, and (3) glycerin, diglycerin, and/or a derivative thereof serving as an organic solvent. Preferably, the water-based ink further contains a polymer (A) serving as a pigment dispersant. The polymer (A) has an anionic group and has a solubility in water of 0.1 g/100 mL or more, a number average molecular weight within the range of 1,000 to 6,000, and an acid value within the range of 40 to 190 mg KOH/g.

Abstract: From a viewpoint of achieving a high-performance organic light-emitting element, ensuring a certain degree of flatness in a coating film obtained by a wet film forming method may not be sufficient. As a result, a desired performance of an organic light-emitting element to be obtained, may not be obtained. Therefore, an object of the present invention is to provide an ink composition for an organic light-emitting element, which can prevent the generation of waviness. There is provided an ink composition for an organic light-emitting element, including: an organic light-emitting element material; a leveling agent; and a solvent, in which the leveling agent is a block copolymer formed by performing copolymerization of at least a siloxane monomer and a hydrophobic monomer.

Abstract: Disclosed are an aqueous pigment dispersion and an aqueous ink for inkjet recording each of which includes a polymer (A), a pigment, and water. The polymer (A) has an anionic group, has a solubility in water of 0.1 g/100 mL or less and a number average molecular weight within the range of 1,000 to 6,000, and forms fine particles in water when the degree of neutralization of the anionic groups with the basic compound is 100%. Preferably, the polymer (A) is a polymer represented by general formula (1) (in formula (1), A1 represents an organic lithium initiator residue, A2 represents a polymer block of a monomer having an aromatic ring or a heterocycle, A3 is a polymer block containing an anionic group, n represents an integer of 1 to 5, and B represents an aromatic group or an alkyl group).

Abstract: There is provided a pigment dispersant that is a block polymer P in which a hydrophobic polymer block A and a hydrophilic polymer block B containing an anionic group are linked to each other. The block polymer P has a number average molecular weight ranging from 1000 to 4000; and where the block polymer P is subjected to 100% neutralization of the anionic group with a basic compound and dispersed in water and where the fine particles of the dispersed block polymer P are subjected to measurement of a scattering profile by small- or ultra-small-angle X-ray scattering that involves use of synchrotron radiation, at least one minimum value in the scattering profile is present within the range of a scattering vector q from 0.1 to 1 nm?1. There is also provided an aqueous pigment dispersion containing the pigment dispersant, a pigment, a basic compound, and an aqueous medium.

Abstract: The present invention provides a method for producing a block copolymer, which includes subjecting styrene or a derivative thereof (excluding ?-methylstyrene) to living anionic polymerization in the presence of a polymerization initiator by means of a microreactor having a channel being capable of mixing a plurality of liquids with each other, reacting a propagation end of the resultant polymer block (A) derived from styrene or a derivative thereof with ?-methylstyrene to obtain an intermediate polymer having a polymer unit (B) derived from ?-methylstyrene bonded to one end of the polymer block (A), and then subjecting a)meth)acrylate compound (c) to living anionic polymerization in the presence of a polymerization initiator so that the polymer unit (B) derived from ?-methyl styrene in the intermediate polymer serves as a propagation end to form a polymer block (C) derived from the)meth)acrylate compound (c)

Abstract: The present invention discloses a production method of core-shell type highly liquid absorbent resin particles comprising: (1) a first step in which a particle core portion is formed by suspension polymerizing an aqueous solution (e) containing (meth)acrylic acid, a crosslinking agent (c) and an anionic surfactant (d) in a hydrophobic organic solvent (a) containing a nonionic surfactant (b), and (2) a second step in which a shell portion that covers the particle core portion is formed by suspension polymerizing an aqueous solution (g) containing a water-soluble vinyl polymer (f), having carboxyl groups and polymerizable unsaturated double bonds and having a number average molecular weight of 500 to 10000, in a suspension obtained in the first step.

Abstract: The present invention discloses a production method of core-shell type highly liquid absorbent resin particles comprising: (1) a first step in which a particle core portion is formed by suspension polymerizing an aqueous solution (e) containing (meth)acrylic acid, a crosslinking agent (c) and an anionic surfactant (d) in a hydrophobic organic solvent (a) containing a nonionic surfactant (b), and (2) a second step in which a shell portion that covers the particle core portion is formed by suspension polymerizing an aqueous solution (g) containing a water-soluble vinyl polymer (f), having carboxyl groups and polymerizable unsaturated double bonds and having a number average molecular weight of 500 to 10000, in a suspension obtained in the first step.