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US 10,961,340 B2Granted
Method for providing surface modifying composition with improved byproduct removal
AssigneeFresenius Medical Care Holdings, Inc.
InventorsJiunn Teo, Craig Kamerath, Praveen Kosaraju, Monica P. Hall
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Abstract
A method forming a surface modifying composition with reduced need for organic solvent and evaporation thereof for removal of insoluble reaction byproducts from the composition. The purified composition can be used in the formation of articles having improved biocompatibility, such as medical articles (e.g., spun hollow fiber).
Claims21
A method comprising:
- forming a first solution by phase transitioning at least a portion of a surface modifying composition to a liquid state, the surface modifying composition comprising:
- a) at least one polymer or oligomer, and
- b) an insoluble reaction byproduct of i) a fluorotelomer alcohol and ii) an isocyanate, wherein said insoluble reaction byproduct is substantially insoluble in said polymer or oligomer;
- and
- removing from the first solution at least a portion of said insoluble reaction byproduct present in the first solution to obtain a second solution;
- wherein said polymer or oligomer comprises a polymer or oligomer backbone covalently attached to at least one surface active group, and wherein the first solution contains the surface modifying composition in an amount of from about 10 wt % to about 100 wt % based on total weight of the first solution.
3 more elements
A method comprising:
- forming a first solution by dissolving at least a portion of a surface modifying composition in dimethylacetamide (DMAC), the surface modifying composition comprising:
- a) at least one polymer or oligomer, and
- b) an insoluble reaction byproduct of i) a fluorotelomer alcohol and ii) an isocyanate;
- wherein said insoluble reaction byproduct is substantially insoluble in DMAC;
- and
- removing from the first solution at least a portion of said insoluble reaction byproduct present in the first solution to obtain a second solution;
- wherein said polymer or oligomer comprises a polymer or oligomer backbone covalently attached to at least one surface active group, and wherein the first solution contains the surface modifying composition in an amount of from about 10 wt % to about 100 wt % based on total weight of the first solution.
4 more elements
A method comprising:
- forming a first solution by dissolving at least a portion of a surface modifying composition in dimethylacetamide (DMAC), the surface modifying composition comprising:
- a) at least one polymer or oligomer, and
- b) an insoluble reaction byproduct of i) a fluorotelomer alcohol and ii) an isocyanate;
- wherein said insoluble reaction byproduct is substantially insoluble in DMAC;
- and
- removing from the first solution at least a portion of said insoluble reaction byproduct present in the first solution to obtain a second solution;
- wherein said polymer or oligomer comprises a polymer or oligomer backbone covalently attached to at least one surface active group;
- and said method further comprising
- combining the second solution with an additional amount of DMAC to obtain a diluted solution;
- combining the diluted solution with a base polymer to obtain an admixture;
- and
- filtering the admixture to obtain a spin dope.
9 more elements
Dependencies are inferred from the claim text.