1. A staple cartridge, for an electric stapler having a driver for striking a staple to sheets of paper and also having a clincher arranged opposed to the driver that bends leg portions of the staple penetrating the sheets of paper, comprising:
a cartridge body that accommodates a large number of staples, and has recess portions on both sides of a front end portion; and
a face plate, having support pieces integrally formed from both side edges toward the rear, the support pieces having a boss, the face plate forming a striking passage for a staple, which is stricken out by the driver, at the front end portion of the cartridge body,
wherein the staple cartridge is detachably attached to the electric stapler, and
wherein the boss of the support pieces are engaged with the recess portions of the cartridge body, and the face plate is slidably and pivotally supported by the cartridge body.
2. The staple cartridge for an electric stapler according to claim 1, wherein a protruded line formed in the longitudinal direction for dividing the recess portion into the front and the rear are provided on a bottom face of the recess portion of the cartridge body.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An amphoteric ion exchange membrane for use in a vanadium redox flow battery, the membrane having a vanadium ion permeability of less than 10\xd710\u22129 cm2min.
2. The amphoteric ion exchange membrane of claim 1, wherein the vanadium ion permeability is less than 6\xd710\u22129 cm2min.
3. The amphoteric ion exchange membrane of claim 1, wherein the vanadium ion permeability is less than 3\xd710\u22129 cm2min.
4. The amphoteric ion exchange membrane of claim 1, comprising a grafted polymer film represented by the following formula:
wherein:
R1, R2, R3, R5, and R6 are independently H, alkyl, alkenyl, alkynyl, cycloalkyl, or heterocyclyl;
R4 is an alkylene or alkenyloxy;
X is an anion;
G is COOA, SO3A, or PO4A;
A is H or a cation;
m is an integer from 100 to 10000;
n is an integer from 60 to 6000; and
x is an integer from 1 to 5.
5. The amphoteric ion exchange membrane of claim 4, wherein R1, R2, R3, R5, and R6 are independently H or alkyl.
6. The amphoteric ion exchange membrane of claim 4, wherein R1, R2, R3, R5, and R6 are independently H or C1-C6 alkyl.
7. The amphoteric ion exchange membrane of claim 4, wherein R1 and R2 are H.
8. The amphoteric ion exchange membrane of claim 4, wherein R1 and R2 are H and R3, R5, and R6 are methyl.
9. The amphoteric ion exchange membrane of claim 4, wherein R4 is alkylene.
10. The amphoteric ion exchange membrane of claim 4, wherein R4 is C1-C12 alkylene.
11. The amphoteric ion exchange membrane of claim 4, wherein R1 and R2 are H; R3, R5, and R6 are methyl; and R4 is \u2014CH2\u2014 or \u2014CH2CH2\u2014.
12. The amphoteric ion exchange membrane of claim 4, wherein X is F\u2212; Cl\u2212; Br\u2212; I\u2212; NO3\u2212; CN\u2212; ClO4\u2212; BF4\u2212; AsF6\u2212; SbF6\u2212; PF6\u2212; CF3SO3\u2212; or B(C6F5)4\u2212.
13. The amphoteric ion exchange membrane of claim 4, wherein each A is independently H, Na+, K+, or NR410, and each R10 is independently H or alkyl.
14. The amphoteric ion exchange membrane of claim 4, wherein the polymer comprises poly(ethylene-co-tetrafluoroethylene).
15. An vanadium redox flow battery comprising the amphoteric ion exchange membrane of claim 4.
16. A method comprising:
preparing a mixture of a polymer, a styrenic monomer, and a (meth)acrylic monomer;
subjecting the mixture to \u03b3-ray irradiation to produce a grafted polymer film;
sulfonating the grafted polymer film to form a sulfonated grafted polymer film; and
hydrolyzing the sulfonated grafted polymer film to produce an amphoteric ion exchange membrane.
17. The method of claim 16, wherein the styrenic monomer is styrene.
18. The method of claim 16, wherein the (meth)acrylic monomer is dimethylaminoethyl methacrylate.
19. The method of claim 16, wherein the sulfonating comprises reacting the grafted polymer film with chlorosulfonic acid.