An aramid paper suitable for use as electrical insulation comprising a first outer layer and a second outer layer, each of which comprising 70 to 30 weight percent aramid floc and 30 to 70 weight percent aramid fibrids, and each of which being free of mica and having a first face and a second face; an inner layer comprising 50 to 70 weight percent aramid material and 30 to 50 weight percent mica and having a first face and a second face; wherein the first face of the first outer layer is a first outer face of the aramid paper, and the second face of the first outer layer is coextensive with and bound face-to-face with the first face of the inner layer solely by fibrids in the first outer layer and the inner layer; and wherein the first face of the second outer layer is coextensive with and bound face-to-face with the second face of the inner layer solely by fibrids in the second outer layer and the inner layer, and the second face of the second outer layer is a second outer face of the aramid paper; the aramid paper having a total of 25 to 40 weight percent mica.

An aramid paper suitable for use as electrical insulation comprising a first outer layer and a second outer layer, each of which comprising 70 to 30 weight percent aramid floc and 30 to 70 weight percent aramid fibrids, and each of which being free of mica and having a first face and a second face; an inner layer comprising 50 to 70 weight percent aramid material and 30 to 50 weight percent mica and having a first face and a second face; wherein the first face of the first outer layer is a first outer face of the aramid paper, and the second face of the first outer layer is coextensive with and bound face-to-face with the first face of the inner layer solely by fibrids in the first outer layer and the inner layer; and wherein the first face of the second outer layer is coextensive with and bound face-to-face with the second face of the inner layer solely by fibrids in the second outer layer and the inner layer, and the second face of the second outer layer is a second outer face of the aramid paper; the aramid paper having a total of 25 to 40 weight percent mica.

A paper suitable for use in a battery or battery pack as a flame barrier or thermal insulation, the paper comprising 60 to 95 weight percent aerogel powder and 5 to 40 weight aramid polymer fibrils; the paper having a thickness of 50 to 4000 micrometers.

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 process for manufacturing an aramid pulp including polyvinyl pyrrolidone (PVP), the method including the steps of: combining para-aramid short-cut with PVP in an aqueous solution to form a mixture, subjecting the mixture to a refining step to form a para-aramid pulp including PVP. It has been found that the process makes it possible to obtain a PVP pulp with improved dewatering properties and energy consumption in combination with a high PVP retention.

A process for manufacturing an aramid pulp including polyvinyl pyrrolidone (PVP), the method including the steps of: combining para-aramid short-cut with PVP in an aqueous solution to form a mixture, subjecting the mixture to a refining step to form a para-aramid pulp including PVP. It has been found that the process makes it possible to obtain a PVP pulp with improved dewatering properties and energy consumption in combination with a high PVP retention.

According the present disclosure, there is provided an aramid pulp and a method for manufacturing the same, in which a completely dried, oilless aramid yarn that has not been applied with a general spinning oil agent is used, and thus the water dispersion and swelling time of the fiber can be reduced as compared with a conventional case, thereby providing an aramid pulp that is improved in productivity and pulp properties and excellent in interfacial adhesion force with different materials.

According the present disclosure, there is provided an aramid pulp and a method for manufacturing the same, in which a completely dried, oilless aramid yarn that has not been applied with a general spinning oil agent is used, and thus the water dispersion and swelling time of the fiber can be reduced as compared with a conventional case, thereby providing an aramid pulp that is improved in productivity and pulp properties and excellent in interfacial adhesion force with different materials.

A paper suitable for use as a cell-to-cell flame barrier in a battery, and a battery comprising the paper, the paper comprising 40 to 70 weight percent fibrids and 30 to 60 weight percent mica, based on the total weight of the fibrids and mica in the paper; wherein the fibrids comprise a blend of 80 to 20 weight percent polymer and 20 to 80 weight percent aerogel powder, based on the total weight of the polymer and aerogel powder in the fibrids; the paper having a thickness of 100 to 4000 micrometers.

A paper suitable for use as a cell-to-cell flame barrier in a battery, and a battery comprising the paper, the paper comprising 40 to 70 weight percent fibrids and 30 to 60 weight percent mica, based on the total weight of the fibrids and mica in the paper; wherein the fibrids comprise a blend of 80 to 20 weight percent polymer and 20 to 80 weight percent aerogel powder, based on the total weight of the polymer and aerogel powder in the fibrids; the paper having a thickness of 100 to 4000 micrometers.