Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ
Patent
1981-10-21
1985-09-24
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
2105002, 264177F, 264178F, 264200, 2642095, B29D 2700
Patent
active
045432210
ABSTRACT:
Improved cellulose semipermeable hollow fibers useful in detoxifying blood during hemodialysis or hemofiltration treatments. The cellulose fibers are fine, capillary fibers that are made by melt extrusion of certain cellulose ester polyol melt spin compositions into self-supporting gelled fibers. The cellulose ester gelled fibers are subsequently chemically converted into cellulose fibers by deacetylation, in aqueous alkali solution. The product fibers exhibit improved wet intrinsic tensile strength and higher water permeability characteristics than heretofore known cellulose fibers made from cellulose ester spin compositions.
The invention includes the method of making the improved fibers and separatory cells such as hemodialyzers or hemofilters which contain the improved fibers in a gamma ray sterilized condition.
REFERENCES:
patent: 3423491 (1969-01-01), McLain et al.
patent: 3441142 (1969-04-01), Oja
patent: 3494780 (1970-02-01), Skiens
patent: 3532527 (1970-10-01), Skiens
patent: 3546209 (1970-12-01), Lipps
patent: 3745202 (1973-07-01), Biggelman et al.
patent: 4276173 (1981-06-01), Kell et al.
Chen David T.
Mahoney Robert D.
Anderson Philip
CD Medical Inc.
Johnson Maynard R.
Kolano John J.
Street Gary D.
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