An ionic composition including an ionic liquid and a polyether compound having a cationic group is provided. The present invention can provide an ionic composition having a very low vapor pressure, low flammability, and excellent low-temperature properties.

A cross-linked rubber obtained by cross-linking a polyether rubber composition containing a polyether rubber and a cross-linking agent, wherein the polyether rubber contains an epihalohydrin monomer unit and an ethylene oxide monomer unit and has a ratio of content of the ethylene oxide monomer unit of 50 to 80 mol % in a total monomer unit, and an acetone extraction amount when the cross-linked rubber is immersed in acetone at 23 C. for 72 hours is 3.5 wt % or less.

A cross-linked rubber obtained by cross-linking a polyether rubber composition containing a polyether rubber and a cross-linking agent, wherein the polyether rubber contains an epihalohydrin monomer unit and an ethylene oxide monomer unit and has a ratio of content of the ethylene oxide monomer unit of 50 to 80 mol % in a total monomer unit, and an acetone extraction amount when the cross-linked rubber is immersed in acetone at 23 C. for 72 hours is 3.5 wt % or less.

A copolymer comprising about 50 to about 80 mol % alkylene oxide, about 5 to about 50 mol % halo epoxide, and 0 to about 15 mol % diene-epoxide. The copolymer has a water-soluble amount of less than 10 wt %. In some embodiments, the volume resistivity of a semi-conductive composition made from the copolymer is between about 1.0*10.sup.5 about to 3.5*10.sup.7 ohms*cm.

A copolymer comprising about 50 to about 80 mol % alkylene oxide, about 5 to about 50 mol % halo epoxide, and 0 to about 15 mol % diene-epoxide. The copolymer has a water-soluble amount of less than 10 wt %. In some embodiments, the volume resistivity of a semi-conductive composition made from the copolymer is between about 1.0*10.sup.5 about to 3.5*10.sup.7 ohms*cm.

A method of production of a polyether rubber containing unit expressed by the following general formula (1) in 0.1 mol % or more and less than 30 mol % obtained by reacting a polyether rubber containing epihalohydrin monomer unit in 0.1 mol % or more and a nitrogen atom-containing aromatic heterocyclic compound by kneading in the presence of an acid acceptor containing at least a hydrotalcite having a nitrogen adsorption specific surface area as measured by a BET method of 10 m.sup.2/g or more is provided.

##STR00001##

wherein, in the above general formula (1), A.sup.+ is a group containing a cationic nitrogen-containing aromatic heterocyclic ring, and is bonded with a carbon atom at the 2 position shown in the above general formula (1) through a nitrogen atom constituting the cationic nitrogen-containing aromatic heterocyclic ring, and X.sup. is any counter anion.

Provided is a material which exhibits excellent ion conductivity and excellent processability and which can provide an electrolyte that exhibits excellent water-resistant shape retention properties after processing. A polyether copolymer having polyether segment blocks having cationic groups and hydrophobic polyether segment blocks. The polyether segments having cationic groups preferably have oxirane monomer units represented by general formula (1). The polyether copolymer may have oxirane monomer units having crosslinkable groups. An electrolyte is obtained by crosslinking a composition containing the polyether copolymer and a crosslinking agent. (In general formula (1), A+ denotes a group having an onium cation structure having a cationic nitrogen atom, and X denotes an anion). ##STR00001##

Provided is a material which exhibits excellent ion conductivity and excellent processability and which can provide an electrolyte that exhibits excellent water-resistant shape retention properties after processing. A polyether copolymer having polyether segment blocks having cationic groups and hydrophobic polyether segment blocks. The polyether segments having cationic groups preferably have oxirane monomer units represented by general formula (1). The polyether copolymer may have oxirane monomer units having crosslinkable groups. An electrolyte is obtained by crosslinking a composition containing the polyether copolymer and a crosslinking agent. (In general formula (1), A+ denotes a group having an onium cation structure having a cationic nitrogen atom, and X denotes an anion). ##STR00001##

A polyether dendrimer of formula (I), ##STR00001##
wherein the symbols and indices have the following meanings: each Y is independently [R.sup.1(OCH.sub.2CH.sub.2).sub.pO]; each Z is independently [R.sup.2(OCH.sub.2CH.sub.2).sub.q(OCH(CH.sub.3)CH.sub.2).sub.rO]; each R.sup.1 is independently H, CH.sub.3 or C.sub.2-C.sub.4-alkyl; each R.sup.2 is independently linear or branched C.sub.8-C.sub.22-alkyl; X is H or C.sub.1-C.sub.4-alkyl; m is 1, 2, 3, 4, 5 or 6; n, o are rational positive numbers >0, with the proviso that the sum of n and o is 2.sup.m; p is a natural number from 5 to 50; q is a natural number from 1 to 50; r is 0 or is a natural number from 1 to 30, with the proviso that 5q+r50, and denotes the bonding of the respective group to the dendron scaffold,
is useful for solubilizing sparingly-water soluble active ingredients, in particular pesticides.

A polyether dendrimer of formula (I), ##STR00001##
wherein the symbols and indices have the following meanings: each Y is independently [R.sup.1(OCH.sub.2CH.sub.2).sub.pO]; each Z is independently [R.sup.2(OCH.sub.2CH.sub.2).sub.q(OCH(CH.sub.3)CH.sub.2).sub.rO]; each R.sup.1 is independently H, CH.sub.3 or C.sub.2-C.sub.4-alkyl; each R.sup.2 is independently linear or branched C.sub.8-C.sub.22-alkyl; X is H or C.sub.1-C.sub.4-alkyl; m is 1, 2, 3, 4, 5 or 6; n, o are rational positive numbers >0, with the proviso that the sum of n and o is 2.sup.m; p is a natural number from 5 to 50; q is a natural number from 1 to 50; r is 0 or is a natural number from 1 to 30, with the proviso that 5q+r50, and denotes the bonding of the respective group to the dendron scaffold,
is useful for solubilizing sparingly-water soluble active ingredients, in particular pesticides.