Flash-spinning of polymeric plexifilaments
US5032326A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 14, 1989 |
| Grant date | Jul 16, 1991 |
| Priority date | — |
| Expiry date | Jul 14, 2009 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F6/04
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An improved process for flash-spinning plexifilamentary film-fibril strands is provided. A 5 to 30 and preferably 10 to 20 percent solution of polymer, preferably linear polyethylene, is formed in a spin fluid that consists essentially of 50 to 90 weight percent methylene chloride and 10 to 50 percent of a halocarbon, which preferably is chlorodifluoromethane, 1,1,1,2-tetrafluoroethane, 1,1-difluoroethane, 1,1,1,2-tetrafluoro-2-chloroethane or 1,1-difluoro-1-chloroethane. The solution is then flash-spun to form high quality plexifilamentary strands. The process avoids the use of halocarbon solvents that could be ozone-depletion hazards.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.