Kanegafuchi Kagaku Kogyo Kabushiki Kaisha

Kaoru Yamazaki

Shunichiro Kurioka

Takahiro Ogawa

Takashi Hatano

Sadame Asada

Mariko Yasuda

Mitsuya Sakata

Fukashi Shibuya

A modacrylic fiber comprising a copolymer containing acrylonitrile, at least one of vinyl chloride and vinylidene chloride, and a sulfo group-containing vinyl monomer having a relative reactivity of at least 1 to acrylonitrile, in a specific ratio. The copolymer is prepared by polymerizing the monomers, while adding the sulfo group-containing vinyl monomer to the polymerization system under the following condition:

Modacrylic synthetic fiber having an excellent devitrification

An acrylonitrile polymer comprising acrylonitrile, at least one of vinyl chloride and vinylidene chloride, a sulfo group-containing vinyl monomer having a higher reactivity ratio than acrylonitrile and a methallyl sulfonic acid monomer, which is prepared by conducting a polymerization in a manner such that at least half amount of the methallyl sulfonic acid monomer to be used is added to the polymerization system in a substantial period of adding the sulfo group-containing vinyl monomer having a higher reactivity ratio than acrylonitrile to the system. The acrylonitrile polymer is suitable for the preparation of a modacrylic synthetic fiber, and the modacrylic fiber prepared therefrom has excellent flame resistance, devitrification preventing property and dyeing affinity.

Acrylonitrile polymer, process for the preparation thereof and fiber

A method of producing an acrylonitrile copolymer of 40 to 65 weight percent acrylonitrile and mainly vinyl chloride and vinylidene chloride in amounts within the range

Method of production of acrylonitrile polymer with vinylbenzyl sulfonic

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Akashi, Japan

Kaoru Yamazaki