Metal-neutralized sulfonated block copolymers, process for making them and their use
View Patent ↗The present disclosure relates to a process for neutralizing a sulfonated block copolymer with a metal compound, to metal-neutralized block copolymers, and to various articles comprising the metal-neutralized block copolymers, e.g., in form of a water vapor permeable membrane which comprises the metal-neutralized block copolymers. The present disclosure further relates to a means and a method for storing and stabilizing a polar component such as a metal compound in a non-polar liquid phase by immuring the polar component in micelles of the sulfonated block copolymer in the non-polar liquid phase.
1. A process for neutralizing a non-neutralized sulfonated block copolymer having a general configuration A-B-D-B-A, A-D-B-D-A, (A-D-B) n (A), (A-B-D) n (A), (A-B-D) n X, (A-D-B) n X, or mixtures thereof, wherein n is an integer from 2 to about 30, X is coupling agent residue, each A block contains essentially no sulfonic acid or sulfonate functional groups, each B block is a polymer block containing from about 10 to about 100 mol-% sulfonic acid or sulfonate functional groups based on the number of monomer units of the B block, and each D block is an impact modifier block having a glass transition temperature less than 20° C., which process comprises
providing a micellar solution comprising from about 1 to about 30%-wt, of the non-neutralized block copolymer and an organic solvent, wherein the organic solvent consists of one or more aprotic, apolar aliphatic solvents, and
adding at least one metal compound to the solution, wherein the metal has an atom number of at least 11.
2. The process of claim 1 wherein from about 80% to about 100% of the sulfonic acid or sulfonate functional groups are neutralized.
3. The process of claim 1 wherein the metal compound is added in an amount of from about 0.8 to about 10 metal equivalents per 1 equivalent of sulfonic acid or sulfonate functional group of the non-neutralized block copolymer.
4. The process of claim 1 wherein the organic solvent is a non-halogenated aliphatic solvent.
5. The process of claim 1 wherein the metal compound is selected from the group of organometal compounds, metal hydrides, metal oxides, metal hydroxides, metal alkoxides, metal carbonates, metal hydrogencarbonates, and metal carboxylates.
6. The process of claim 1 wherein the metal compound comprises sodium, potassium, cesium, magnesium, calcium, strontium, barium, aluminum, tin, lead, titanium, zirconium, vanadium, chromium, molybdenum, manganese, iron, cobalt, nickel, copper, silver, zinc, cadmium, or mercury.
7. The process of claim 1 wherein the metal of the metal compound has an atom number of at least 12.
8. The process of claim 1 wherein the metal compound comprises magnesium, calcium, aluminum, copper, or zinc.
9. The process of claim 1 wherein the metal is in an oxidation state of +2, +3 or +4.
10. A means for storing a polar component comprising a non-polar, liquid phase and from about 1 to about 30%-wt, of a sulfonated block copolymer having a general configuration A-B-D-B-A, A-D-B-D-A, (A-D-B) n (A), (A-B-D) n (A), (A-B-D) n X, (A-D-B) n X, or mixtures thereof, wherein n is an integer from 2 to about 30, X is coupling agent residue, each A block contains essentially no sulfonic acid or sulfonate functional groups, each B block is a polymer block containing from about 10 to about 100 mol-% sulfonic acid or sulfonate functional groups based on the number of monomer units of the B block, and each D block is an impact modifier block having a glass transition temperature less than 20° C.,
wherein the non-polar, liquid phase consists of one or more aprotic, non-polar aliphatic solvents, and the sulfonated block copolymer is present in the non-polar, liquid phase in micellular form adapted to immure the polar component.
11. A process for stabilizing or storing a polar component in a non-polar liquid phase which comprises
a. providing solution comprising a non-polar, liquid phase and from about 1 to about 30%-wt, of a sulfonated block copolymer having a general configuration A-B-D-B-A, A-D-B-D-A, (A-D-B) n (A), (A-B-D) n (A), (A-B-D) n X, (A-D-B) n X, or mixtures thereof, wherein n is an integer from 2 to about 30, X is coupling agent residue, each A block contains essentially no sulfonic acid or sulfonate functional groups, each B block is a polymer block containing from about 10 to about 100 mol-% sulfonic acid or sulfonate functional groups based on the number of monomer units of the B block, and each D block is an impact modifier block having a glass transition temperature less than 20° C.,
wherein the solution comprises the sulfonated block copolymer in micellular form,
wherein the non-polar, liquid phase consists of one or more aprotic, non-polar aliphatic solvents, and
b. adding at least one polar component to the solution (a) whereby the polar component is immured in the micelles.
12. The process of claim 11 wherein the polar component is a metal compound.