Japan Atomic Energy Research Institute

Hiroshi Mitomo

Fumio Yoshii

Keizo Makuuchi

Naotsugu Nagasawa

Tamikazu Kume

Darmawan Darwis

Shin Hasegawa

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

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

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Kiryu, Japan

Hiroshi Mitomo