Abstract:
Provided is a polyphenylene sulfide fiber for which changes in fiber structure are small and which has excellent long-term heat resistance. That is, the present invention is a polyphenylene sulfide fiber characterized in that the degree of crystallinity is at least 45.0%, the amount of mobile amorphous phases is not more than 15.0%, and the weight average molecular weight is not more than 300,000.
Abstract:
These polyphenylene sulfide fibers are characterized in that the fibers contain 1-10wt% of a polyphenylene sulfide oligomer having a weight average molecular weight of at most 5,000, in that during the DSC heating process the difference (ΔHm-ΔHc) between the cold crystallization heat (ΔHc) and the crystalline melting heat (ΔHm) is at least 25J/g, and in that the elongation is less than 40% and the strength is at least 3.0cN/dtex. The polyphenylene sulfide fibers have high heat resistance and chemical resistance, as well as high strength, while providing high order workability, such as thermoforming properties, because of the high molecular mobility of the amorphous part thereof.
Abstract:
This nonwoven fabric is a spunbonded nonwoven fabric composed of monocomponent fibers comprising a copolyester resin derived by copolymerizing a polyester resin with 5-40 wt.% polyethylene glycol, characterized in that the ΔMR of the spunbonded nonwoven fabric is 0.5% to 15% inclusive.
Abstract:
Provided is a polyphenylene sulfide fiber for which changes in fiber structure are small and which has excellent long-term heat resistance. That is, the present invention is a polyphenylene sulfide fiber characterized in that the degree of crystallinity is at least 45.0%, the amount of mobile amorphous phases is not more than 15.0%, and the weight average molecular weight is not more than 300,000.
Abstract:
These polyphenylene sulfide fibers are characterized in that the fibers contain 1-10wt% of a polyphenylene sulfide oligomer having a weight average molecular weight of at most 5,000, in that during the DSC heating process the difference (ΔHm-ΔHc) between the cold crystallization heat (ΔHc) and the crystalline melting heat (ΔHm) is at least 25J/g, and in that the elongation is less than 40% and the strength is at least 3.0cN/dtex. The polyphenylene sulfide fibers have high heat resistance and chemical resistance, as well as high strength, while providing high order workability, such as thermoforming properties, because of the high molecular mobility of the amorphous part thereof.
Abstract:
Provided is a poly(phenylene sulfide) fiber which changes little in fiber structure and has excellent long-term heat resistance. Namely, a poly(phenylene sulfide) fiber having a degree of crystallization of 45.0% or higher, a content of movable amorphous components of 15.0% or less, and a weight-average molecular weight of 300,000 or less is provided.
Abstract:
A poly(phenylene sulfide) fiber containing 1-10% by weight of a poly(phenylene sulfide) oligomer having a weight-average molecular weight of 5,000 or less, having a difference between a cold crystallization heat quantity (”Hc) and a crystal melting heat quantity (”Hm) during temperature rising in DSC, ”Hm-”Hc, of 25 J/g or larger, and having an elongation of less than 40% and a strength of 3.0 cN/dtex or higher. The present invention provides a poly(phenylene sulfide) fiber which has high heat resistance and chemical resistance and which has high strength and, despite this, has excellent suitability for high-order processing, e.g., thermal shapability, because the amorphous parts thereof have high molecular movability.