Patent ID: 11965275
Assignee: ASCEND PERFORMANCE MATERIALS OPERATIONS LLC
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC D  B | IPC D

Claim 6:
7. A method for preparing a polyamide nanofiber nonwoven product, comprising:
(a) providing a polyamide composition comprising N6, N66, N6T/66, N612, N6/66, N6I/66, N66/6I/6T, N11, and/or N12, wherein “N” means Nylon, having a moisture content, and having a relative viscosity (RV) from 2 to 330 for spinning;
(b) spinning or melt blowing the polyamide composition at a temperature in the range of 215° C. to 315° C. into a plurality of nanofibers; and
(c) forming the nanofibers into the nanofiber nonwoven product, wherein the nanofiber nonwoven product has a RV from 2 to 330,
wherein polyamide nanofiber nonwoven product comprises from 1 to 20% of the nanofiber diameters are greater than 700 nanometers; and
wherein the polyamide nanofiber nonwoven product has an Air Permeability Value of less than 600 CFM/ft2; and
wherein the moisture content is controlled by drying the polyamide composition to have a moisture content from 0.005 wt. % to 1 wt. %, and rehydrating the dried polyamide composition.