Toppan Printing Co., Ltd.

Hitachi, Ltd.

The University of Tokyo

Toppan Inc.

Nao Nishijima

Yumiko Oomori

Mitsuharu Kimura

Kosuke Shimizu

Tomoyuki Ozawa

Yoji Ozawa

Akira Isogai

Akiko Saiki

Kazuko Imai

Shuji Fujisawa

Ming Yin

Koshi Ikegawa

What is provided is a method for producing a composite-particle composition including a first step of obtaining a dispersion liquid of fine fibers; a second step of coating a surface of liquid droplets of a polymerizable monomer or a polymer with the fine fibers in the dispersion liquid to stabilize the liquid droplets as an emulsion; a third step of polymerizing the liquid droplets of the polymerizable monomer or the polymer to obtain composite particles including the polymer coated with the fine fibers; and a fourth step of adsorbing a compound that forms an ionic bond in a pair with an ionic functional group of the fine fibers onto the fine fibers in the surface of the composite particles.

Composite particles, composite-particle composition, and method for producing composite-particle composition

A distributed ledger management method performed by each of nodesconfiguring a distributed ledger system, includes: holding, in an end block, signatures of respective organizations operating the respective nodes, hash values of respective groups of blocks into which a blockchainis divided by a number of the operating organizations, information on organizations by which the group of blocks is to be held, and a verification frequency for the hash value between the organizations; specifying a group of blocks to be held by the organization; deleting a block other than the group of blocks in the blockchain; and performing a tamper verification of requesting a nodeof another organization to transmit the hash value of the group of blocks to be held by the other organization at a verification frequency, and collating the hash value with the hash value included in the end block

Distributed ledger management method, distributed ledger system, and node

A distributed ledger management systemincludes: an orderer nodethat generates a block containing transactions issued by a client, verifies the validity of the transactions contained in the block, distributes the block and verification results to a peer node, adds the block to a blockchainin its storage device, and stores the verification results in its storage device; and the peer nodethat receives the block and verification results from the orderer node, adds information on predetermined events indicated by the transactions to state informationin a storage device of the peer node, and discards the block and verification results.

Distributed ledger management system, distributed ledger management method, and node

In some examples, a first computing device of a first entity receives a first digital certificate from a certificate authority computing device and generates a first self-signed certificate associated with the first digital certificate. The first computing device may store the first self-signed certificate associated with the first digital certificate in a repository associated with a repository computing device. Further, the first computing device may receive a notification indicating an update by a computing device of a second entity to contents of the repository. The first computing device receives a copy of the contents of the repository including at least a second digital certificate and a second self-signed certificate associated with the second entity. The first computing device may verify the contents of the repository and generate a genesis block of a blockchain based on a result of the verifying.

Secure bootstrap for a blockchain network

A gas barrier sheet material which make effective use of natural resources and which has improved gas barrier properties including oxygen barrier properties, water vapor barrier properties and smell barrier properties, and improved flexibility; a barrier container using the same; and a method for fabricating a sheet material. A sheet material is characterized in that a fine fiber layer and a moisture-retaining layer are stacked on at least one surface of a substrate in such a way that the fine fiber layer and the moisture-retaining layer are in direct contact with each other. The invention is more advantageous when using a substrate, e.g. paper, a nonwoven fabric, or a porous membrane, of which surface profile is not flat and which is inherently susceptible to causing troubles in fabrication processes, such as of soaking, wetting and drying during coating of a coating agent.

Sheet material and barrier packaging container using the same, and method for fabricating the sheet material

A laminate having high adhesion between a fine cellulose layer and a base material, a method for producing the same, and a gas barrier material. The laminate is such that a fine cellulose layer containing fine cellulose having a carboxyl group is laminated on the base material, and a mixed layer in which the fine cellulose is mixed in the base material is further interposed between the base material and the fine cellulose layer. This laminate can be produced by coating the base material with a dispersion containing fine cellulose having a carboxyl group, swelling the base material with the thus coated dispersion, and drying the swollen base material and the coated dispersion. The laminate may also be produced by providing a swollen base material, coating the swollen base material with a dispersion containing fine cellulose having a carboxyl group, and drying the base material and the coated dispersion.

Laminate, method for producing same, and gas barrier material

Disclosed is a material that effectively utilizes natural resources and is friendly to the environment as a whole. Specifically, disclosed is a barrier material that has excellent strength and excellent affinity and adhesion to a paper base due to an interaction with paper fibers and that gives sufficient barrier properties even in the form of a thin film. A laminated body () includes, on at least one surface of a base () made of paper, a fiber layer () containing fine cellulose fibers each having a fiber diameter of 1 nm or more and 10 &#x3bc;m or less. In particular, the fine cellulose fibers preferably have a fiber diameter of 1 nm or more and 30 nm or less.

Laminated body, method for producing the same, and molded container

A method for preparing a cellulose dispersion includes oxidizing cellulose; preparing cellulose nanofibers by defibrating the oxidized cellulose; and adding a water-soluble polymer and inorganic particles to the dispersion containing the cellulose nanofibers.

Composition for film formation, laminate, film, sheet base material, method for producing a composition for film formation, and method for preparing a cellulose dispersion

[Problem] To provide a composition for film formation comprising cellulose fibers, a layered inorganic compound, and a water-soluble polymer, which are each dispersed on nano level, a method for preparing a cellulose dispersion capable of forming a moisture-resistant film containing cellulose nanofibers, a gas-barrier laminate obtained by use of the dispersion, and a packaging material using the laminate. [Solution] A film-forming composition comprising at least cellulose fibers and a swollen inorganic compound is prepared. The method of preparing a cellulose dispersion comprises the steps of oxidizing cellulose, fibrillating the thus oxidized cellulose to prepare cellulose nanofibers, and adding a water-soluble polymer and inorganic particles to the dispersion containing the cellulose nanofibers.

Composition for film formation, laminate, film, sheet base material, method for producing composition for film formation, and method for preparing a cellulose dispersion

A low cost sample analysis chip in which liquid is supplied to wells formed on the chip so as to carry out reaction by a simple liquid supply method with no variation in the amount of liquid in each well, the sample analysis chip including a plurality of wells and a flow passage leading to the respective wells, wherein the flow passage includes a main flow passage which supplies liquid to each well, and the sample analysis chip has the main flow passage provided closer to the rotation center side than the well; and is formed so as to have one peak between neighboring wells in the direction of rotation center.

Growing community of inventors

Tokyo, Japan

Nao Nishijima