Membranes of diisocyanate addition polymers for hemodialysis and

Details Membranes of diisocyanate addition polymers for hemodialysis and Membranes of diisocyanate addition polymers for hemodialysis and

1986-08-25

1988-08-30

Sever, Frank

Liquid purification or separation

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Material

55158, B01D 1300

Patent

active

047675357

ABSTRACT:
Membranes are disclosed which are suitable for hemodialysis and/or hemofiltration, prepared from aliphatic diisocyanates, particularly cycloaliphatic diisocyanate such as cyclohexane diisocyanate-(1,4), particularly the transisomer and at least one compound which displays two active hydrogen atoms. For the reaction a molar ratio of soft segment to hard segment from 0 to 0.20, particularly from 0 to 0.1, is employed. Serving particularly for construction of the hard segments are compounds such as hydrazine, ethylene diamine, ethylene glycol and butanediol-(1,4). It is recommended to prepare the addition polymer in the presence of a aprotic solvent and a dissolving coagent such as lithium chloride or calcium chloride. Polyethers such as polyethylene glycol are particularly suitable for construction of the soft segment. The membrane is characterized by an ultrafiltration rate of from 0.5 to 300, particularly 0.5 to 100 ml/h.m.sup.2.Torr, and a dialytic permeability for vitamin B.sup.12 of 0.5 to 20.10..sup.-3 cm./min.

REFERENCES:
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Merrill, E. W. et al, International application published under PCT, Pub. No. WO83/00695, Mar. 3, 1983.
Syzcher, M. et al, "Polyurethane Elastomers . . . ", Elastomerics, Mar. 1983, pp. 11-15.
Lyman, D. J. et al, "New Synthetic Membranes . . . ", Trans. Am. Soc. Artif. Int. Organs, 1965, vol. 11, pp. 91-94.
Klein et al, "Evaluation of Hemodialyzers . . . ", U.S. Dhew Pub. No. (NIH)77-1294, pp. 14-26.
Banks, J. E., Naming Organic Compounds, W. B. Saunders, Co., Philadelphia, PA, 1967, p.13.

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