Kanebo, Limited

Kanebo Co., Ltd.

Atsushi Yamamoto

Toshihiro Yamamoto

Yoshikazu Kondo

Toshikazu Fuse

Junji Sano

Shunya Ida

A method for preparing silk fibers crosslinked with an epoxy compound is disclosed. Silk fibers are soaked in an aqueous processing liquid containing a water-soluble epoxy compound and a catalyst wherein the solubility of the silk fiber is at most 30% by weight when the silk fiber is soaked in an aqueous 5 wt % sodium hydroxide solution at a temperature of 65.degree. C. for 60 minutes, and dyeing depth, K/S, at 520 nm with 9% owf of a red reactive dye, Color Index Reactive Red 63 at the temperature of 60.degree. C. for 60 minutes is at most 7.

Silk fiber having good abrasion resistance and good light resistance and

Deep-colored fibrous articles, such as fabrics colored in a deep black shade, having on it surfaces a film coating of a resin mixture comprising at least two resins that are mutually miscible but incompatible and in phase-separated conditions. Color-deepening effect is augmented by forming pits and/or recesses and projections on the surfaces of the film coating by using resins different in solvent-solubility and eluting the resin having a larger solubility with a solvent. The above effect is further augmented by using resins different in plasma etching resistance and subjecting the formed film coating to a low-temperature plasma etching treatment. The plasma etching is effectively conducted by placing the fibrous article within a plasma sheath, preferably contacting with an antenna electrode. The deep color can be made abrasion resistant by further depositing an abrasion resistant resinous film on the pit-formed resinous film coating without filling up the pits.

Deep-colored fibers and a process for manufacturing the same

The present invention provides silk fiber crosslinked with an epoxy compound, characterized in that solubility of the silk fiber is 30% by weight or less when the silk fiber is soaked in an aqueous 5 wt. % sodium hydroxide solution at a temperature of 65.degree. C. for 60 minutes, and dyeing depth, K/S, at 520 nm with 9% owf. of a red reactive dye, color Index Reactive Red 63 at the temperature of 60.degree. C. for 60 minutes is 7 or less. The silk fiber has improved properties including long term resistance to light deterioration and resistance to fibrillation.

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Hikone, Japan

Atsushi Yamamoto