NONAQUEOUS SUSPENSION EXHIBITING ELECTRORHEOLOGICAL EFFECT, AND DAMPER USING SAME

1 . A non-aqueous suspension exhibiting an electrorheological effect, comprising:

a non-aqueous liquid;

organic polymer particles dispersed in the non-aqueous liquid, wherein the organic polymer particles have at least one type of ion in the inside or on the surface of the organic polymer particles; and

a salt,

wherein when a 5 kV/mm voltage is applied between a pair of electrodes, the logarithmic value of frequency factor in Arrhenius equation for the current density (μA/cm 2 ) flowing between the electrodes through the non-aqueous suspension is 20 or more.

2 . The non-aqueous suspension according to claim 1 , wherein the organic polymer particles are polyurethane particles obtained by reacting a polyol with an isocyanate to give a NCO/OH equivalent ratio of 0.6 to 0.9.

3 . The non-aqueous suspension according to claim 1 , wherein the organic polymer particles are polyurethane particles having an ion content of 400 ppm or more as determined by ICP-MS analysis.

4 . The non-aqueous suspension according to claim 3 , wherein the organic polymer particles comprise a lithium ion in the inside or on the surface of the organic polymer particles.

5 . A damper comprising:

two electrodes;

the non-aqueous suspension according to claim 1 disposed between the two electrodes; and

a high resistance membrane disposed on a surface of at least one of the electrodes, the surface being in contact with the non-aqueous suspension.

6 . The non-aqueous suspension according to claim 1 , wherein the salt comprises at least one element selected from the group consisting of lithium, zinc, chromium, copper, nickel, cobalt, iron, manganese, and tungsten.

7 . A damper comprising:

two electrodes;

the non-aqueous suspension according to claim 2 disposed between the two electrodes; and

a high resistance membrane disposed on a surface of at least one of the electrodes, the surface being in contact with the non-aqueous suspension.

8 . A damper comprising:

two electrodes;

the non-aqueous suspension according to claim 3 disposed between the two electrodes; and

a high resistance membrane disposed on a surface of at least one of the electrodes, the surface being in contact with the non-aqueous suspension.

9 . A damper comprising:

two electrodes;

the non-aqueous suspension according to claim 4 disposed between the two electrodes; and

a high resistance membrane disposed on a surface of at least one of the electrodes, the surface being in contact with the non-aqueous suspension.

10 . A damper comprising:

two electrodes;

the non-aqueous suspension according to claim 6 disposed between the two electrodes; and

a high resistance membrane disposed on a surface of at least one of the electrodes, the surface being in contact with the non-aqueous suspension.

11 . The damper according to claim 5 , wherein the specific resistance of the high resistance membrane is 10 9 to 10 14 Ωcm.

12 . The damper according to claim 7 , wherein the specific resistance of the high resistance membrane is 10 9 to 10 14 Ωcm.

13 . The damper according to claim 8 , wherein the specific resistance of the high resistance membrane is 10 9 to 10 14 Ωcm.

14 . The damper according to claim 9 , wherein the specific resistance of the high resistance membrane is 10 9 to 10 14 Ωcm.

15 . The damper according to claim 10 , wherein the specific resistance of the high resistance membrane is 10 9 to 10 14 Ωcm.