Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1978-01-30
1979-07-10
De Benedictis, Sr., Thomas
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
210 22R, 210500M, 264 41, 264216, 528204, 528196, C08L 6900
Patent
active
041607910
ABSTRACT:
Polycarbonate membranes useful for hemodialysis are fabricated from polyether-polycarbonate block copolymers by a water gelation process. The process comprises casting onto a substrate surface a layer of a multicomponent casting solution comprising the copolymer dissolved in a water-miscible organic solvent together with a cosolvent which acts as a swelling agent for the copolymer, drying the layer to partially evaporate the solvents therefrom, immersing the partially dried layer in water to form a gelled membrane, and stripping the gelled membrane from the substrate surface. The membrane has improved strength and improved permeability to solutes in the "middle molecule" range while maintaing clinically acceptable ultrafiltration rates and clearance of low molecular weight solutes.
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Cantor Paul A.
Fisher Bruce S.
Higley Willard S.
De Benedictis, Sr. Thomas
The United States of America as represented by the Secretary of
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