Ion-sensitive substance, ion-sensitive membrane using the same, and method for producing the ion-sensitive substance

Patent metadata

Field	Value
Publication number	US-11745145-B2
Application number	US-202117241838-A
Country	US
Kind code	B2
Filing date	Apr 27, 2021
Priority date	May 25, 2020
Publication date	Sep 5, 2023
Grant date	Sep 5, 2023

Abstract

An ion-sensitive substance containing a crown ether structure composed of a repeating unit represented by formula (a): —CR 1 R 2 —CR 3 X—O— . . . (a) (in the formula, X is an organic group having an alkoxysilyl group at a terminal, and R 1 , R 2 and R 3 are each a hydrogen atom or a hydrocarbon group), and a part or all of the alkoxysilyl groups in the crown ether structure may be hydrolyzed to form a silanol group.

First claim

What is claimed is:

1. An ion-sensitive substance comprising:
a crown ether structure composed of repeating units represented by formula (a):
—CR 1 R 2 —CR 3 X—O—  (a)

where X is an organic group having an alkoxysilyl group at a terminal, with the proviso that at least one of the organic groups X has a silanol group at a terminal, and
R 1 , R 2 and R 3 are each a hydrogen atom or a hydrocarbon group,
wherein a number of the organic groups X having terminal alkoxysilyl groups is the same as a number of oxygen atoms constituting the crown ether structure.

2. The ion-sensitive substance of claim 1 ,
wherein the crown ether structure is a polymer containing a portion derived from a first compound having an epoxy group and an alkoxysilyl group at a terminal, and the polymer is obtained by ring-opening polymerization of the epoxy group with an alkali metal salt or a Group 2 element salt to form a ring.

3. The ion-sensitive substance of claim 1 , wherein in formula (a), R 1 , R 2 and R 3 are each a hydrogen atom and X is represented by formula (b):
—CH 2 O—Y  (b)

wherein Y is a monovalent organic group having the alkoxysilyl group or the silanol group at a terminal.

4. The ion-sensitive substance of claim 2 ,
wherein a cation of the alkali metal salt or the salt of the Group 2 element is any of lithium ion, sodium ion, and potassium ion.

5. The ion-sensitive substance of claim 1 ,
wherein the number of repetitions of formula (a) is 4 or more and 6 or less.

6. An ion-sensitive membrane comprising the ion-sensitive substance of claim 1 ,
wherein a portion derived from the alkoxysilyl group constitutes a siloxane bond.

7. The ion-sensitive membrane of claim 6 ,
wherein the siloxane bond is constituted by a portion derived from the alkoxysilyl group in the crown ether structure and a portion derived from an alkoxysilyl group in a compound represented by formula (c):
R 4 —Z  (c)

where R 4 is a monovalent hydrocarbon group, and
Z is a monovalent organic group having an alkoxysilyl group at a terminal.

8. The ion-sensitive membrane of claim 7 ,
wherein a ratio of a molar number of a portion derived from Z in formula (c) to a sum of a molar number of a portion derived from X in formula (a) and a molar number of a portion derived from Z in formula (c) is 0.9 or less.

9. The ion-sensitive membrane of claim 7 ,
wherein a ratio of a sum of a molar number of a portion derived from the alkoxy group in X and a molar number of a portion derived from the alkoxy group in Z to a sum of a molar number of a portion derived from X in formula (a) and a molar number of a portion derived from Z in formula (c) is 2.00 or more and 2.90 or less.

10. An ion-sensitive substance comprising
a crown ether structure composed of repeating units represented by formula (a):
—CR 1 R 2 —CR 3 X—O—  (a)

where X is an organic group having an alkoxysilyl group at a terminal, with the proviso that at least one of the organic groups X has a silanol group at a terminal, and
R 1 , R 2 and R 3 are each a hydrogen atom or a hydrocarbon group,
wherein the crown ether structure is any one of 12-Crown-4, 15-Crown-5 or 18-Crown-6, and a number of the organic groups X having terminal alkoxysilyl groups is the same as a number of oxygen atoms constituting the crown ether structure.

11. The ion-sensitive substance of claim 10 ,
wherein the crown ether structure is a polymer containing a portion derived from a first compound having an epoxy group and an alkoxysilyl group at a terminal, and the polymer is obtained by ring-opening polymerization of the epoxy group with an alkali metal salt or a Group 2 element salt to form a ring.

12. The ion-sensitive substance of claim 10 ,
wherein in formula (a), R 1 , R 2 and R 3 are each a hydrogen atom and X is represented by formula (b):
—CH 2 O—Y  (b)

wherein Y is a monovalent organic group having the alkoxysilyl group or the silanol group at a terminal.

13. The ion-sensitive substance of claim 11 ,
wherein a cation of the alkali metal salt or the salt of the Group 2 element is any of lithium ion, sodium ion, and potassium ion.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Toyota Kei
• Tsukahara Norihito

Classifications

• B01D69/10 Primary

  Supported membranes; Membrane supports · CPC title

• C07F7/1804

  Compounds having Si-O-C linkages (Si-O-acyl linkages C07F7/1896) · CPC title

• B01D71/30

  Polyalkenyl halides · CPC title

• B01D71/46

  Epoxy resins · CPC title

• B01D2311/2649

  Filtration · CPC title