A nanofiber nonwoven product is disclosed which comprises a polyamide with a relative viscosity from 2 to 330, spun into nanofibers with an average diameter of less than 1000 nanometers (1 micron). In general, the inventive products are prepared by: (a) providing a polyamide composition, wherein the polyamide has a relative viscosity from 2 to 330; (b) melt spinning the polyamide composition into a plurality of nanofibers having an average fiber diameter of less than 1 micron, followed by (c) forming the nanofibers into the product.

A nanofiber nonwoven product is disclosed which comprises a polyamide with a relative viscosity from 2 to 330, spun into nanofibers with an average diameter of less than 1000 nanometers (1 micron). In general, the inventive products are prepared by: (a) providing a polyamide composition, wherein the polyamide has a relative viscosity from 2 to 330; (b) melt spinning the polyamide composition into a plurality of nanofibers having an average fiber diameter of less than 1 micron, followed by (c) forming the nanofibers into the product.

A breathable water resistant film provided by the present disclosure includes a base cloth and a nanofiber layer disposed on the base cloth, wherein the nanofiber layer is formed by an electrospinning solution including a first additive and a second additive. The first additive includes a nylon copolymer and an alcohol, and the second additive includes a polysilazane resin and a perfluoropolyether-modified polysilazane resin.

A breathable water resistant film provided by the present disclosure includes a base cloth and a nanofiber layer disposed on the base cloth, wherein the nanofiber layer is formed by an electrospinning solution including a first additive and a second additive. The first additive includes a nylon copolymer and an alcohol, and the second additive includes a polysilazane resin and a perfluoropolyether-modified polysilazane resin.

A sound absorbing body comprises a non-woven fabric or a non-woven fabric laminate, the non-woven fabric or the non-woven fabric laminate comprises a fiber that has an average fiber diameter of less than 3,000 nm, the non-woven fabric or the non-woven fabric laminate has a thickness of less than 10 mm, the non-woven fabric or the non-woven fabric laminate has a unit thickness flow resistance of greater than 4.0 E+06 Ns/m.sup.4 and less than 5.0 E+08 Ns/m.sup.4, and the non-woven fabric or the non-woven fabric laminate has a bulk density of greater than 70 kg/m.sup.3 and less than 750 kg/m.sup.3.

A sound absorbing body comprises a non-woven fabric or a non-woven fabric laminate, the non-woven fabric or the non-woven fabric laminate comprises a fiber that has an average fiber diameter of less than 3,000 nm, the non-woven fabric or the non-woven fabric laminate has a thickness of less than 10 mm, the non-woven fabric or the non-woven fabric laminate has a unit thickness flow resistance of greater than 4.0 E+06 Ns/m.sup.4 and less than 5.0 E+08 Ns/m.sup.4, and the non-woven fabric or the non-woven fabric laminate has a bulk density of greater than 70 kg/m.sup.3 and less than 750 kg/m.sup.3.

Disclosed is shock absorbing pad having a composite nonwoven pad having a nonwoven construction, wherein the composite nonwoven pad has a face surface and an opposed back surface and comprising a nonwoven blend of fibers and a heat set binder material. The nonwoven construction of the composite nonwoven pad provides for a vertical water drainage capability of the composite nonwoven pad, and wherein the vertical water drainage capability is from 10 inches per hour to 500 inches per hour as determined by ASTM D3385.

Disclosed is shock absorbing pad having a composite nonwoven pad having a nonwoven construction, wherein the composite nonwoven pad has a face surface and an opposed back surface and comprising a nonwoven blend of fibers and a heat set binder material. The nonwoven construction of the composite nonwoven pad provides for a vertical water drainage capability of the composite nonwoven pad, and wherein the vertical water drainage capability is from 10 inches per hour to 500 inches per hour as determined by ASTM D3385.

A method may produce a heat-resistant resin composite excellent in heat resistance and bending properties. This heat-resistant resin composite is constituted of a matrix resin and reinforcing fibers dispersed in the matrix resin. The matrix resin is constituted of a heat-resistant thermoplastic polymer having a glass transition temperature of 100° C. or higher, and a polyester-based polymer comprising a terephthalic acid unit (A) and an isophthalic acid unit (B) at a copolymerization proportion (molar ratio) of (A)/(B)=100/0 to 40/60. The proportion of the heat-resistant thermoplastic polymer in the composite is 30 to 80 wt %.

A method may produce a heat-resistant resin composite excellent in heat resistance and bending properties. This heat-resistant resin composite is constituted of a matrix resin and reinforcing fibers dispersed in the matrix resin. The matrix resin is constituted of a heat-resistant thermoplastic polymer having a glass transition temperature of 100° C. or higher, and a polyester-based polymer comprising a terephthalic acid unit (A) and an isophthalic acid unit (B) at a copolymerization proportion (molar ratio) of (A)/(B)=100/0 to 40/60. The proportion of the heat-resistant thermoplastic polymer in the composite is 30 to 80 wt %.