Resin composition, membrane-forming stock solution, porous membrane, and hollow fiber membrane, water treatment device, electrolyte support, and separator using porous membrane

1. A resin composition comprising the following component (A), and component (B);

component (A): a membrane-forming polymer,

component (B): a polymer obtained by polymerizing a monomer composition containing a (meth)acrylic acid ester macromonomer (b1) represented by the following Formula (1) and another monomer (b2), wherein the polymer of the component (B) contains a graft copolymer of another monomer (b2) having the monomer unit derived from the macromonomer (b1) in the side chain,

wherein:

R and R 1 to R n are each independently represent a hydrogen atom, an alkyl group which optionally have a substituent, a cycloalkyl group, an aryl group which optionally have a substituent, an aryl group which optionally have a substituent or a heterocyclic group which optionally have a substituent, provided that at least one of R and R 1 to R n is not a hydrogen atom;

X 1 to X n each independently represent a hydrogen atom or a methyl group;

Z represents a terminal group, and

n represents a natural number of from 3 to 10,000.

2. The resin composition according to claim 1 , wherein the component (A) is a polymer containing a fluorine atom or a chlorine atom in the molecule.

3. The resin composition according to claim 2 , wherein the polymer containing a fluorine atom in the molecule is at least one polymer selected from the group consisting of polyvinylidene fluoride, a polyvinylidene fluoride-hexafluoropropylene copolymer, an ethylene-chlorotrifluoroethylene copolymer, and polytetrafluoroethylene.

4. The resin composition according to claim 2 , wherein the polymer containing a chlorine atom in the molecule is at least one polymer selected from the group consisting of polyvinyl chloride and chlorinated polyvinyl chloride.

5. The resin composition according to claim 1 , wherein the component (A) is at least one polymer selected from the group consisting of a polyolefin, a polysulfone, polyether sulfone, cellulose, and any derivative thereof.

6. The resin composition according to claim 1 , wherein a proportion of a monomer unit of the macromonomer (b1) with respect to a total mass of a monomer unit of the macromonomer (b1) and a monomer unit of another monomer (b2) in the component (B) is from 5 to 99% by mass.

7. The resin composition according to claim 1 , wherein another monomer (b2) is at least one (meth)acrylic acid ester selected from the group consisting of (meth)acrylic acid ester, a (meth)acrylic acid ester having a polyethylene glycol unit in a side chain, and a (meth)acrylic acid ester having a hydroxyl group.

8. A membrane-forming stock solution comprising the resin composition according to claim 1 and a solvent capable of dissolving the component (A).

9. The membrane-forming stock solution according to claim 8 , wherein a transmittance of visible light at a wavelength of 400 nm is 70% or more.

10. The resin composition according to claim 1 , wherein the substituent is at least one group or atom selected from the group consisting of an alkyl group, an aryl group, a carboxyl group, an alkoxycarbonyl group represented by —COOR', a cyano group a hydroxyl group, an amino group, an amide group represented by —CONR′R″, a halogen, an allyl group, an epoxy group, an alkoxy group represented by —OR', and a hydrophilic or ionic group, wherein R′ and R″ each independently represents an alkyl group, a cycloalkyl group, or an aryl group.

11. The resin composition according to claim 1 , further comprising a component (C) which is a polymer containing a vinylpyrrolidone unit.

12. The resin composition according to claim 11 , wherein a content of the component (C) with respect to 100 parts by mass of a total amount of the component (A), the component (B), and the component (C) is from 0.1 to 50 arts by mass.

13. The resin composition according to claim 1 , the component (B) further contains a block copolymer containing the monomer unit derived from the macromonomer (b1) and the monomer unit derived from another monomer (b2).

14. A porous membrane comprising a component (A), and a component (B), wherein:

the component (A) is a membrane-forming polymer, and

the component (B) is a polymer containing a monomer unit derived from a (meth)acrylic acid ester macromonomer (b1) represented by the following Formula (1) and a monomer unit derived from another monomer (b2), wherein the polymer of the component (B) contains a graft copolymer of another monomer (b2) having the monomer unit derived from the macromonomer (b1) in the side chain,

wherein:

R and R 1 to R n are each independently a hydrogen atom, an alkyl group which optionally have a substituent, a cycloalkyl group which optionally have a substituent, an aryl group which optionally have a substituent, or a heterocyclic group which optionally have a substituent, provided that at least one of R and R 1 to R n is not a hydrogen atom;

X 1 to X n , are each independently a hydrogen atom or a methyl group;

Z is a terminal group; and

n is 3 to 10,000.

15. A hollow fiber membrane comprising the porous membrane according to claim 14 .

16. An electrolyte support comprising the porous membrane according to claim 14 and an electrolyte.

17. A separator comprising the porous membrane according to claim 14 .

18. A water treatment device comprising the porous membrane according to claim 14 .

19. The porous membrane according to claim 14 , wherein the component (A) is a polymer containing a fluorine atom or a chlorine atom in the molecule.

20. The porous membrane according to claim 19 , wherein the polymer containing a fluorine atom is at least one polymer selected from the group consisting of polyvinylidene fluoride, a polyvinylidene fluoride-hexafluoropropylene copolymer, an ethylene-chlorotrifluoroethylene copolymer, and polytetrafluoroethylene.

21. The porous membrane according to claim 19 , wherein the polymer containing a chlorine atom is at least one polymer selected from the group consisting of polyvinyl chloride and chlorinated polyvinyl chloride.

22. The porous membrane according to claim 14 , wherein the component (A) is at least one polymer selected from the group consisting of a polyolefin, a polysulfone, a polyether sulfone, cellulose, and any derivative thereof.

23. The porous membrane according to claim 14 , wherein a proportion of the monomer unit derived from the macromonomer (b1) with respect to a total mass of the monomer unit of the macromonomer (b1) and the monomer unit derived from another monomer (b2) in the component (B) is from 5% to 99% by mass.

24. The porous membrane according to claim 14 , wherein another monomer (b2) is at least one (meth)acrylic acid ester selected from the group consisting of (meth)acrylic acid ester, a (meth)acrylic acid ester having a polyethylene glycol unit in a side chain, and a (meth)acrylic acid ester having a hydroxyl group.

25. The porous membrane according to claim 14 , wherein the porous membrane is obtained by a method including a step of obtaining a porous membrane precursor using a membrane-forming stock solution, and a transmittance of visible light of the membrane-forming stock solution comprising a resin composition at a wavelength of 400 nm is 70% or more, wherein the resin composition comprising the component (A) and component (B).

26. The porous membrane according to claim 14 , wherein the substituent is at least one group or atom selected from the group consisting of an alkyl group, an aryl group, a carboxyl group, an alkoxycarbonyl group represented by —COOR', a cyano group a hydroxyl group, an amino group, an amide group represented by —CONR′R″, a halogen, an allyl group, an epoxy group, an alkoxy group represented by —OR', and a hydrophilic or ionic group, wherein R′ and R″ each independently represents an alkyl group, a cycloalkyl group, or an aryl group.

27. The porous membrane according to claim 14 , further comprising a component (C) which is a polymer containing a vinylpyrrolidone unit.

28. The porous membrane according to claim 14 , the component (B) further contains a block copolymer containing the monomer unit derived from the macromonomer (b1) and the monomer unit derived from another monomer (b2).