Fluorinated Elastic Tube
A fluorinated elastic tube includes: an elastic hollow body made of a fluorinated polymer; and an amorphous perfluororesin membrane having a thickness of not greater than 1 μm and being in direct close contact with the inner surface of the hollow body. The amorphous perfluororesin membrane may have a repeating unit of, for example, formula (1), (2a), or (2b). The fluorinated elastic tube can have further improved durability while ensuring solvent resistance. wherein R 1 , R 2 , and R 3 are each independently a fluorine atom or a perfluoroalkyl group; p+q+r is an integer of from 1 to 6; p is an integer of from 0 to 5; q is an integer of from 0 to 4; and r is 0 or 1.
1 . A fluorinated elastic tube comprising: an elastic hollow body made of a fluorinated polymer; and an amorphous perfluororesin membrane having a thickness of not greater than 1 μm and being in direct close contact with the inner surface of the hollow body.
2 . The fluorinated elastic tube according to claim 1 , wherein the amorphous perfluororesin is a perfluororesin having a ring structure in a main chain thereof.
3 . (canceled)
4 . The fluorinated elastic tube according to claim 1 , wherein the amorphous perfluororesin membrane has a critical surface tension of not higher than 20 mN/m.
5 . The fluorinated elastic tube according to claim 1 , wherein the elastic hollow body made of a fluorinated polymer comprises a porous fluororesin and a fluoroelastomer filling pores of the porous fluororesin.
6 . The fluorinated elastic tube according to claim 5 , wherein the elastic hollow body made of a fluorinated polymer is a roll-shaped product having a first layer made of a fluoroelastomer and a second layer made of a porous fluororesin, of which pores are filled with a fluoroelastomer.
7 . The fluorinated elastic tube according to claim 6 , wherein the thickness ratio of the first layer to the second layer (the first layer/the second layer) is not higher than 6.5/1.
8 . The fluorinated elastic tube according to claim 5 , wherein the porous fluororesin is an expanded porous polytetrafluoroethylene.
9 . The fluorinated elastic tube according to claim 5 , wherein the porous fluororesin has a pore ratio of from 40% to 98%.
10 . The fluorinated elastic tube according to claim 5 , wherein the porous fluororesin has a maximum pore diameter of from 0.01 to 20 μm.
11 . The fluorinated elastic tuber according to claim 5 , wherein the elastic hollow body has an inner diameter of from 1 to 40 mm and a thickness of from 0.5 to 25 mm.
12 . The fluorinated elastic tube according to claim 1 , wherein the elastic hollow body comprises a reinforcing layer and/or a low frication layer formed on the outer surface thereof.
13 . The fluorinated elastic tube according to claim 12 , wherein the reinforcing layer and/or the low frication layer is a tube-shaped product made of a fluororesin, a fluororesin coating layer, or a carbon-based coating layer.
14 . A pinch bulb comprising the fluorinated elastic tube according to claim 1 .
15 . A roller pump comprising the fluorinated elastic tube according to claim 1 .
16 . The fluorinated elastic tube, wherein the amorphous perfluororesin has a repeating unit of the formula:
wherein R 1 , R 2 , and R 3 are each independently a fluorine atom or a perfluoroalkyl group; p+q+r is an integer of from 1 to 6; p is an integer of from 0 to 5; q is an integer of from 0 to 4; and r is 0 or 1.
17 . The fluorinated elastic tube, wherein the amorphous perfluororesin has a repeating unit of the formula:
wherein R 1 , R 2 , and R 3 are each independently a fluorine atom or a perfluoroalkyl group; p+q+r is an integer of from 1 to 6; p is an integer of from 0 to 5; q is an integer of from 0 to 4; and r is 0 or 1.
18 . The fluorinated elastic tube, wherein the amorphous perfluororesin has a repeating unit of the formula:
wherein R 1 , R 2 , and R 3 are each independently a fluorine atom or a perfluoroalkyl group; p+q+r is an integer of from 1 to 6; p is an integer of from 0 to 5; q is an integer of from 0 to 4; and r is 0 or 1.