Unitika Ltd.

Unitika Fibers Ltd.

Masahiro Hosoda

Tsunetoshi Matsuda

Masaki Nishimura

Seiji Abe

Kunio Akasaki

Shuhei Kurata

Mitsuo Omori

Eiji Tsukamoto

Miho Yoshida

Hideharu Yamamoto

Takeshi Nishiyama

Minoru Fujii

An antibacterial polyamide filament which comprises a polyamide resin containing 0.1 to 5.0 mass % of fine zinc oxide particles and exhibits a color difference caused by the treatment with an alkaline solution of 2.5 or less; and a method for producing the antibacterial polyamide filament which comprises adjusting the moisture content of a polyamide resin chip to 0.05 to 2.0 mass %, followed by melt spinning. Preferably, the antibacterial polyamide filament has a bacteriostatic activity after 50 washings of 2.2 or more, which filament can be produced by melt-spinning the polyamide resin to melt spinning and solidifying the resin at a position 400 mm or less from the face of a spinning nozzle.

Antibacterial polyamide fiber and method for producing the same

A polyamide resin composition comprising a polyamide and an alkaline earth metal compound, wherein the amount of a cyclic monomer formed by melting said composition under the conditions of a moisture content of 0.02% by weight or less, at 0.01 Torr or below, at 250.degree. C., and for 8 hours is not more than 0.7 parts by weight per 100 parts by weight of the polyamide; and fibers, films and molded articles with the use of the same.

Polyamide resin composition, and fibers, films and molded articles using

A photochromic compound represented by formula (I): ##STR1## wherein one of X.sub.1 and X.sub.2 represents a hydroxyl group, a sulfonic acid group or an alkali metal sulfonate base, and the other of X.sub.1 and X.sub.2 represents a hydrogen atom; X.sub.3 and X.sub.4 each represents a hydrogen atom, a lower alkyl group having from 1 to 3 carbon atoms, a lower alkoxy group having from 1 to 3 carbon atoms, a halogen atom, a nitro group or a cyano group; and R represents a straight chain alkyl group having from 1 to 30 carbon atoms. The compound exhibits excellent color developability.

Spiroindolinenaphthoxadine photochromic compounds

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Kyoto, Japan

Masahiro Hosoda