Plastic and nonmetallic article shaping or treating: processes – Formation of solid particulate material directly from molten... – By extrusion spraying or gravity fall through orifice
Patent
1989-07-14
1991-07-16
Lorin, Hubert C.
Plastic and nonmetallic article shaping or treating: processes
Formation of solid particulate material directly from molten...
By extrusion spraying or gravity fall through orifice
264205, 264211, 26421114, D01D 511
Patent
active
050323261
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.
REFERENCES:
patent: 3081519 (1963-03-01), Blades et al.
patent: 3227794 (1966-01-01), Anderson
patent: 3467744 (1969-09-01), Woodell
patent: 3564088 (1971-02-01), Woodell
patent: 3655498 (1972-04-01), Woodell
patent: 3756441 (1973-09-01), Anderson et al.
patent: 3879519 (1975-04-01), Woodell
patent: 4554207 (1985-11-01), Lee
P. S. Zurer, "Search Intensifies for Alternatives to Ozone-Depleting Hydrocarbons", Chemical & Engineering News, pp. 17-20 (Feb. 8, 1988).
Fluorocarbon/Ozone Update, "Alternatives to Fully Halogenated Chlorofluorocarbons", The du Pont Development Program, du Pont Bulletin E-90566 (Mar. 1987).
E. I. Du Pont de Nemours and Company
Lorin Hubert C.
LandOfFree
Flash-spinning of polymeric plexifilaments does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flash-spinning of polymeric plexifilaments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flash-spinning of polymeric plexifilaments will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-129752