Nisshinbo Holdings Inc.

Nisshinbo Industries, Inc.

Toshifumi Hashiba

Kazutoshi Hayakawa

Erina Matsuzaka

Takaya Sato

Hiroshi Yoshida

Satomi Kudo

Ikuo Takahashi

Kaori Satoh

Kohei Moriyama

Goki Yamada

Tsuyoshi Fujii

The present invention provides amphiphilic polymer particles which are formed from a naturally derived starting material and exhibit hydrophobicity, while maintaining an adequate water absorption. An amphiphilic alginic acid particle group which is obtained by subjecting a polyvalent metal salt of alginic acid to a hydrophobization treatment with use of a hydrophobizing agent, wherein: some metal ions in the polyvalent metal salt of alginic acid are hydrophobized through a chemical bond with the hydrophobizing agent; the contact angle at 30 seconds after dropping a water droplet on the particle group is from 30° to 150°; and the water absorption per 100 g of the particles is not less than the oil absorption per 100 g of the particles.

Amphiphilic alginic acid particle group and method for producing same

This production method is for disc-shaped polymer particles having an average aspect ratio of 1-1.3. The method comprises conducting, in a solvent, solution polymerization of monomers including a hydrophobic unsaturated monomer which is liquid at 25&#xb0; C., in the presence of a polymerization initiator, a surfactant, and/or a polymer stabilizer, wherein a solvent mixture containing water, a hydrophilic organic solvent, and a hydrophobic organic solvent is used as the solvent, and, as the polymerization initiator, one or more polymerization initiators soluble in at least one of water, the hydrophilic organic solvent, and the hydrophobic organic solvent are used as a combination that is soluble in all of water, the hydrophilic organic solvent, and the hydrophobic organic solvent, such that the hydrophobic unsaturated monomer, water, the hydrophilic organic solvent, and the hydrophobic organic solvent are mixed at a predetermined ratio.

Production method for disc-shaped polymer particles

A method for producing elliptical, needle-shaped, or rod-shaped polymer particles satisfying (1)-(3) below includes a step in which a synthesis solution including water, a mixed solvent of a hydrophilic organic solvent and a hydrophobic organic solvent, a polymeric stabilizer, a polymerization initiator, and an unsaturated monomer is heated, and, at least after the heating has started, the pH of the synthesis solution is adjusted to 5-9 inclusive to perform solution polymerization: (1) the average (L) length (L) in a two-dimensional projection diagram obtained by irradiating the particles with light from a direction orthogonal to the longitudinal direction is 0.1-80 &#x3bc;m; (2) the average (D) breadth (D) in the two-dimensional projection diagram obtained by irradiating the particles with light from the direction orthogonal to the longitudinal direction is 0.05-40 &#x3bc;m; and (3) the average (P) aspect ratio (L/D) calculated from the length (L) and the breadth (D) is 1.5-30.

Method for producing elliptical, needle-shaped, or rod-shaped polymer particles

These flat elliptical polymer particles have a front view, a planar view, and a side view in a projection diagram based on third-angle projection which are all elliptical. The flat elliptical polymer particles satisfy (1)-(4): (1) the average length (L) of flat portions satisfies 0.13&#x2264;(L)&#x2264;500 &#x3bc;m; (2) the average breadth (D) of the flat portions satisfies 0.1&#x2264;(D)&#x2264;250 &#x3bc;m; (3) the average (P1) aspect ratio (L/D) calculated from the length (L) and the breadth (D) satisfies 1.3&#x3c;P1&#x2264;50; and (4) the average (P2) aspect ratio (D/T) calculated from the breadth (D) and the thickness (T) of the side surface satisfies 1.2&#x3c;P2&#x2264;100.

Flat elliptical polymer particles, and use thereof

Conductive particles each includes a polymer base particle and a conductive layer coating the polymer base particle. Let the compressive elastic deformation characteristic Kof one conductive particle when the displacement of particle diameter of the conductive particles is X % be defined by the following formula: K=(3/&#x221a;2)&#xb7;(S)&#xb7;(R)&#xb7;F. Fis the load (N) necessary for X % displacement of the conductive particles. Sis the compressive deformation amount (mm) upon X % displacement of the conductive particles. R is the particle radius (mm) of the conductive particles. The compressive elastic deformation characteristic Kwhen the displacement of particle diameter of the conductive particles is 50% is 100 to 50000 N/mmat 20&#xb0; C., and the recovery factor of particle diameter of the conductive particles when the displacement of particle diameter of the conductive particles is 50% is not less than 30% at 20&#xb0; C.

Conductive particles and method of preparing the same

Flaky particles which are produced through easy conversion from mother particles by using an organic compound other than monomers having double bonds as the hardening and crosslinking agent and to which at least one mechanical or functional characteristic selected from among reactivity, close adhesion, and tackiness is imparted by the presence of part of the unreacted reactive groups of the organic compound inside and on the particles; and a process for the production of the flaky particles. More specifically, flaky particles composed of mother particles (A) having functional groups and an organic compound (B) which has groups reactive with the functional groups of the particles (A) and is soluble in a solvent, characterized in that at least part of the functional groups of the mother particles (A) and at least part of the reactive groups of the organic compound (B) react with each other to form crosslinks.

Flat particles and process for production thereof

A composite particle that can be easily converted to cured particle or half cured particle by the use of carbodiimide resin without changing of the configuration of matrix particle of, for example a thermoplastic resin, excelling in mechanical and functional characteristics by virtue of the reaction capability inherently possessed by a carbodiimide group. In particular, a composite particle comprising matrix particle (A) having a functional group capable of reacting with a carbodiimide group and carbodiimide resin (B), characterized in that the functional group of the matrix particle (A) couples with the carbodiimide group of the carbodiimide resin (B) and that the composite particle is provided with an outer shell layer of carbodiimide resin (B) having an average thickness diameter (L), defined by the following formula [1], ranging from 0.01 to 20 &#x3bc;m: L=(L&#x2212;L)/2 [1] wherein L1 represents the average diameter of matrix particle, and L2 represents the average diameter of composite particle.

Composite particle with a carbodiimide resin layer and a process for producing the same

A hardening type reactive particles which contain a carbodiimide compound in such a way to have the reactive performance the carbodiimide group inherently has only in the surface layer section or both surface layer section and inside of the base particle, without deforming shape of the base particle. The hardening type reactive particles each comprising a base particle (A) of thermoplastic resin having a functional group and carbodiimide compound (B) impregnated only in the surface layer section or both surface layer section and inside of the base particle, wherein the base particle (A) and carbodiimide compound (B) are strong bonded to each other by the crosslinking reaction taking place under heating between the functional group in the former and carbodiimide group in the latter, and a process for producing the same.

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Chiba, Japan

Toshifumi Hashiba