C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
18/613, 400/9461
C08K 5/02 (2006.01) D01D 5/11 (2006.01) D01F 6/04 (2006.01)
Patent
CA 1338408
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.
609849
E. I. Du Pont de Nemours And Company
Sim & Mcburney
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