Method of producing extrusion grade poly(arylene sulfide)
US4500706A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 9, 1982 |
| Grant date | Feb 19, 1985 |
| Priority date | — |
| Expiry date | Aug 9, 2002 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01D1/106
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method of producing poly(arylene sulfide) resin suitable for the commercial production of fibers. The method includes the two stage melt filtration of a suitable poly(arylene sulfide) polymer, e.g., poly(p-phenylene sulfide), through a primary filter having an absolute micron rating of no more than about 125 microns, and through a secondary filter having a maximum absolute micron rating of about 80 or a substantially equivalent filter capacity. Also disclosed are various forms of apparatus for performing the method. In one form the apparatus employs a depth type filter of metallurgically bonded micronic size stainless steel fibers as the primary filter and one or more edge sealed screen combinations each containing one 325 mesh screen as the secondary filter. A secondary filter comprising a mesh screen and a quantity of suitable sand is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.