Daicel Chemical Industries, Ltd.

Japan Atomic Energy Research Institute

Tadashi Murakami

Fumio Yoshii

Tamikazu Kume

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

Composite films have a layer structure comprising a base film, and a coating layer containing a vinylidene chloride polymer, a laminating agent layer composed of a polyisocyanate component and a polyol component, and a polymer film as laminated in that order on at least one side of the base film. The vinylidene chloride polymer is a copolymer having a vinylidene chloride content of 91 to 94% or a copolymer having a weight average molecular weight of 7.5.times.10.sup.4 to 20.times.10.sup.4. By using such copolymer, the transparency and gas barrier properties can be prevented from decreasing and the heat-sealed portions from whitening. The base film includes nylon films, among others. The base film may also be a stretched or oriented one. The polymer film includes heat-weldable films.

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Matsudo, Japan

Tadashi Murakami