Japan Atomic Energy Research Institute

Yoshino Kogyosho Co., Ltd.

Daicel Chemical Industries, Ltd.

Mitsui Petrochemical Industries, Ltd.

Other

Chisso Corporation

Japan Atomic Energy Agency

Nichiban Company Limited

Agency of Industrial Science and Technology, Japan Atomic Energy

Fumio Yoshii

Keizo Makuuchi

Tamikazu Kume

Hideo Kushida

Naotsugu Nagasawa

Isao Kaetsu

Isao Ishigaki

Hideshi Kawachi

Mikio Nakagawa

Hiroshi Okubo

Masanobu Ishiyama

Yasuo Futami

Tadashi Murakami

Hiroshi Mitomo

Takahiro Kurihara

Sei Nakajima

Gen Miyamoto

Ryoji Sugawara

Jun Saito

Masao Tamada

Yasuaki Kitazaki

Noboru Kasai

Shingo Kikukawa

Akihiro Hiroki

Machiko Takigami

Toshiaki Yagi

Kazuki Isobe

Kotohiko Shinozaki

Darmawan Darwis

Yosuke Katsumura

Shin Hasegawa

Varghese Siby

Hiroshi Iida

Toyokazu Owada

Haruyo Amada

Quoc Hien Nguyen

Yuko Nishisako

A method of preparing a gel from carboxymethyl cellulose alkali metal salt, which is an anionic cellulose derivative, by using acid or acid solution. To increase the strength and the elasticity of a gel, a water-insoluble metal compound or organic reinforcement is added when mixing. The obtained gel is one of environmentally friendly type gels because the raw material is derived from plant.

Preparation of gels derived from carboxymethyl cellulose alkali metal salt

A process for producing a chitin derivative and/or a chitosan derivative that have a crosslinked structure, which comprises irradiating a paste of a mixture consisting of 100 parts by weight of a chitin derivative and/or a chitosan derivative and 3&#x2dc;1,000 parts by weight of purified water.

Process for producing chitin derivatives and/or chitosan derivatives having a crosslinked structure

A process for producing a self-cross-linking alkyl cellulose derivative, which includes irradiating, with radioactive rays, a mixture of a starting alkyl cellulose derivative (the number of carbon atoms of the alkyl group is 1 through 3, the alkyl group may be substituted by a hydroxyl group or a carboxyl group, and the carboxyl group may form a salt) (100 parts by weight) and water (5&#x2013;2,000 parts by weight), and thus obtained self-cross-linking alkyl cellulose derivative has an improved biodegradability and excellent water-absorbability.

Self-cross-linked alkyl cellulose

A process for producing a self-cross-linking alkyl cellulose derivative, which includes irradiating, with radioactive rays, a mixture of a starting alkyl cellulose derivative (the number of carbon atoms of the alkyl group is 1 through 3, the alkyl group may be substituted by a hydroxyl group or a carboxyl group, and the carboxyl group may form a salt) (100 parts by weight) and water (5-2,000 parts by weight), and thus obtained self-cross-linking alkyl cellulose derivative has an improved biodegradability and excellent water-absorbability.

Self-cross-linked alkyl cellulose and processes for producing the same

A paste of starch derivative is crosslinked by irradiation with &ggr;-rays or electron beams in a dose of 0.1-200 kGy. Two different levels of crosslinking are performed; the first is mild crosslinking by irradiation at a low dose of 0.1-1.0 kGy to such an extent that the viscosity of the overall system increases upon immersion in water, and the second is intensive crosslinking by irradiation at a higher dose than 1.0 kGy to produce a gel that is completely insoluble in water.

Process for producing grosslinked starch derivatives and crosslinked starch derivatives produced by the same

Sodium alginate which is an oceanic natural resource is exposed, either in aqueous solution or in a dry state, to a radiation so that it is decomposed to a lower-molecular weight polysaccharide, which is processed into a dilute aqueous solution that is either used as a hydroponic solution or foliar spraying so as to promote their growth.

Plant growth promoter

The tear strength of a vulcanized natural rubber latex shaped article is improved by shaping a mixture of a prevulcanized natural rubber latex and a water-soluble polymer. The prevulcanization of a natural rubber latex may be done by exposure to a radiation. The water-soluble polymer may be selected from the group consisting of polyvinyl alcohol, polyethylene oxide, polyvinyl pyrrolidone and mixtures thereof. The water-soluble polymer may be added to the vulcanized natural rubber latex in an amount of 1-10 parts by weight per 100 parts by weight of the natural rubber.

Method of shaping from a mixture of prevulcanized natural rubber latex

Polycaprolactone (PCL) is melted at a temperature of 60.degree. C. or higher and subsequently cooled down to a non-crystallizing temperature and exposed to radiation so that it is crosslinked and a network structure is introduced to impart heat resistance to the PCL. Because of the high degrees of its crosslinking, heat resistance and transparency, the PCL product can be used as a heat-resistant tape or a heat-shrinkable film.

Process for producing crosslinked polycaprolactone

Disclosed are a PVA hydrogel which comprises being obtained by irradiating a polyvinyl alcohol aqueous solution containing a polymer selected from the group consisting of polyvinyl pyrrolidone, a methyl vinyl ether-maleic anhydride copolymer and an isobutylene-maleic anhydride copolymer, with ionizing radiations, a process for preparing the PVA hydrogel, a hydrogel laminate using the PVA hydrogel, a process for preparing the hydrogel laminate, and a hydrogel wound-dressing material using the PVA hydrogel.

PVA hydrogel, hydrogel laminate using the same and hydrogel

A squeezable tubular container (a) which is formed from a composition containing a polyethylene having a density of 0.900 to 0.975 g/cm.sup.3 and an ethylene/.alpha.-olefin copolymer having a density smaller than 0.900 g/cm.sup.3, (b) has a crosslinking caused under irradiation with electron beam, and (c) is sterilizable at a high temperature or is heat-sealable or ultrasonically sealable; and a process for the production thereof.

Squeezable tubular container and process for the production thereof

A process for producing a modified polypropylene having a very high melt tension and superior stiffness and moldability, and a molded product obtained by using the modified polypropylene are provided.

Process for producing a modified polypropylene and a molded product

A process for forming a container of acrylonitrile polymers by biaxial-orientation blow-molding a preform. A preform of thermoplastic resin, mainly acrylonitrile polymers, is irradiated with an electron beam or a gamma-ray. Immediately after the irradiation, the preform is heated at 40.degree. C. or higher to reduce residual acrylonitrile monomer in the preform to 0.1 ppm or less. Then, the preform is biaxial-orientation blow molded to form a container.

Process for forming container of acrylonitrile polymers by

A process for producing a slow-release powder which permit various active ingredients such as perfumes, insect control agents, rust inhibitors, mold inhibitors and antibacterial agents to be slowly released over a prolonged time, the process comprising the steps of mixing a long-chain compound with the ingredients, mixing the resulting mixture with urea, and exposing the resulting urea adduct to radiation.

Processes for producing slow-release powders

This invention provides a process for producing a transparent shaped polymeric product which is free from defects such as strain and bubbles and has improved chemical and physical properties. The product is produced from a methyl methacrylate- or methyl acrylate-based monomer mixture by cast polymerization for a significantly shortened time.

Process for producing a transparent shaped polymeric product

Growing community of inventors

Takasaki, Japan

Fumio Yoshii