Polyphenylene sulfide fiber, method for producing the same, wet-laid nonwoven fabric, and method for producing wet-laid nonwoven fabric
US8734614B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 8, 2009 |
| Grant date | May 27, 2014 |
| Priority date | — |
| Expiry date | Jan 1, 2030 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H27/00
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A polyphenylene sulfide fiber has an amount of heat of crystallization measured by DSC is 10 J/g or more and the degree of shrinkage on dry heating of 150° C.×30 minutes is 20% or less. A method produces a densified wet-laid nonwoven fabric by subjecting paper produced in a papermaking process and containing 60 to 100% by mass of a polyphenylene sulfide fiber having an amount of heat of crystallization of 10 J/g or more and an amount of heat of crystallization of the wet-laid nonwoven fabric before heating-pressurizing treatments is 5 J/g or more to heating-pressurizing treatment at a temperature that is not lower than the glass transition temperature and not higher than the melting point of the polyphenylene sulfide fiber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.