The present invention relates to a polyester resin for an adhesive strength-improved binder and a polyester fiber using the same, in which adhesive properties of the polyester resin for the adhesive strength-improved binder are not lowered at high temperatures since melt viscosity even at high temperatures of the polyester resin for the adhesive strength-improved binder, as a polyester resin for a binder, the polyester resin including terephthalic acid or an ester-forming derivative thereof as an acid component and including 2-methyl-1,3-propanediol, 2-methyl-1,3-pentanediol, and ethylene glycol as diol components, is not greatly lowered.

Fibrous structures, for example sanitary tissue products, containing a plurality of filaments that employ one or more filament-forming materials, such as one or more hydroxyl polymers, and one or more hueing agents, present within the filaments such that the fibrous structures exhibit a Whiteness Index of greater than 72 as measured according to the Whiteness Index Test Method described herein.

It is an object of the present invention to provide a nonwoven fabric having mechanical strength which is hardly cut and broken by an external force, and a separator for electrochemical devices using the nonwoven fabric.

The inventive nonwoven fabric has a sum of tensile strengths by zero-span per basis weight in the machine direction and the cross-machine direction of 6.5N/50 mm or more. Thus, the strength of the constituent fibers of this nonwoven fabric against an external force is high, and this nonwoven fabric has mechanical strength which is hardly cut and broken by an external force.

The separator for electrochemical devices of the present invention is composed of this nonwoven fabric.

A nonwoven web material is formed from fibers including a first polymer, a second polymer and a filler. The first polymer and second polymer may be olefin homopolymers and the filler may be calcium carbonate. The second polymer may have a lower melt flow rate than the first polymer. The fibers are formed in a monocomponent, i.e., monofilament, or multicomponent, e.g., sheath-core bicomponent, arrangement. The nonwoven web material may be used to form an article such as a medical product, a surgical product, a personal protective product, and/or an industrial garment.

In accordance with one embodiment of the present disclosure, a nonwoven web may be manufactured by a process that includes forming a bicomponent fiber and forming the bicomponent fiber into the nonwoven web. The bicomponent fiber may comprise one or more primary polymer regions and two or more secondary polymer regions. The primary polymer regions may comprise polyethylene. The secondary polymer regions may comprise polypropylene, polyester, or polyamide. The primary polymer regions may comprise at least 2.5 wt. % of polypropylene, polyester, or polyamide, or the secondary polymer regions may comprise at least 2.5 wt. % of polyethylene, or both.

A process for forming a splittable fiber having the steps of providing a multicomponent fiber; or a multicomponent staple fiber, providing a finish material, and at least partially coating the multicomponent fiber with the finish material to form a splittable fiber. The multicomponent fiber; or a multicomponent staple fiber, contains a first thermoplastic segment comprising polymer component A and a second thermoplastic segment comprising polymer component B. The finish material has an evaporation point of less than about 160° C. A process for forming a nonwoven fabric, a split multicomponent fiber, a split multicomponent fiber with a durable charge, a nonwoven fabric, and a filter and/or a spun yarn formed by the fibers herein is also described.

A network of microfibers are fabricated with a core-shell construction from sustainable materials, where the core includes a phase-change material, such as coconut oil, and the shell includes a biomass, such as cellulose. The microfibers are made via a wet-wet electrospinning process utilizing a coaxial spinneret with an inner conduit and an outer conduit. The biomass and the phase-change material are coaxially extruded into a coagulation bath including a mixture of ethanol and water. The collected microfibers exhibit a beaded structure of PCM aggregates and biomass connecting regions between the aggregates and are effective to aid in the thermoregulation of the immediate environment surrounding the network. The microfibers are suitable for use in a variety of sustainable products such as wearable thermoregulating textiles, wall/ceiling panels, insulation, packaging material, and more.

Described herein is an acoustic building panel comprising: a body comprising a fibrous material and having a first major surface opposite a second major surface and a side surface extending there-between, the fibrous material comprising polyester fiber in an amount of at least 70 wt. % based on the total weight of the fibrous material; wherein the body has a bulk density as measured between the first major surface, the second major surface, and the side surface, the bulk density ranging from about 4.8 lb./ft.sup.3 to about 6.0 lb./ft.sup.3.

Provided are bicomponent fibers. The bicomponent fiber comprises a first region and a second region. The first region comprises a first ethylene/alpha-olefin interpolymer, and the second region comprises a second ethylene/alpha-olefin interpolymer. The first ethylene/alpha-olefin interpolymer has a highest peak melting temperature (Tm) less than 130° C. and at least 3.5° C. greater than a highest peak melting temperature of the second ethylene/alpha-olefin interpolymer. The bicomponent fibers can be used for forming nonwovens that in aspect have improved tensile strength, elongation at break, and/or abrasion resistance.

The disclosure generally relates to bicomponent fibers, and more particularly, methods to make bicomponent fibers and articles comprising them, wherein a first extruded component has a moisture level less than a second extruded component. The bicomponent fibers may comprise polyesters and are useful in articles such as carpets and fabrics.