Methods for producing ultrafine fiber and ultrafine fiber-containing sheet, sheet obtained thereby, and resin composite comprising laminated resins
US10273633B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 2015 |
| Grant date | Apr 30, 2019 |
| Priority date | — |
| Expiry date | Aug 12, 2035 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2457/20
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An object of the present invention is to provide a method for producing an ultrafine fiber-containing sheet with suppressed yellowing. The present invention provides a method for producing an ultrafine fiber-containing sheet, comprising (a) introducing a substituent having electrostatic and/or steric functionality to a fiber raw material to obtain substituent-introduced fiber; (b) machine-processing the substituent-introduced fiber obtained in the step (a) to obtain substituent-introduced ultrafine fiber; (c) preparing a sheet from the substituent-introduced ultrafine fiber obtained in the step (b); and (d) eliminating at least a portion of introduced substituents from the sheet obtained in the step (c). In a preferred aspect, the substituent having electrostatic and/or steric functionality is a phosphoric acid-derived group, and the method may further comprise, after the step (a) and before the step (c), the step of (e) changing the degree of neutralization of the substituent-introduced fiber or the substituent-introduced ultrafine fiber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.