Japan Atomic Energy Research Institute

Daicel Chemical Industries, Ltd.

Agency of Industrial Science and Technology, Japan Atomic Energy

Tamikazu Kume

Fumio Yoshii

Naotsugu Nagasawa

Tadashi Murakami

Keizo Makuuchi

Hiroshi Mitomo

Quoc Hien Nguyen

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.

Growing community of inventors

Takasaki, Japan

Tamikazu Kume