An acrylic rubber that is a copolymer in which 1 to 4 wt. % of a reactive halogen group-containing vinyl monomer is copolymerized as a crosslinkable comonomer, wherein 45 to 65 wt. % of n-butyl acrylate, 10 to 35 wt. % of 2-methoxyethyl acrylate and 8 to 30 wt. % of ethoxyethoxyethyl acrylate are copolymerized in 100 wt. % of comonomers other than the crosslinkable comonomer. This ethoxyethoxyethyl acrylate-copolymerized acrylic rubber can suppress the reduction of oil resistance while improving cold resistance represented by a TR-10 value, and by compounding it with a vulcanizing agent corresponding to the crosslinkable group thereof, a crosslinkable composition is formed.

An acrylic rubber bale excellent in storage stability and water resistance and a method for producing the same are provided. An acrylic rubber bale, including an acrylic rubber having a reactive group, with a specific ash content, a large proportion of magnesium and phosphorus in the ash, and a specific ratio of magnesium and phosphorus, is highly excellent in storage stability and water resistance. This acrylic rubber bale can be produced by using a specific stabilizer and a specific coagulant in an emulsion polymerization process of an acrylic rubber and performing a process from coagulation process to baling process under specific conditions.

An acrylic rubber bale excellent in storage stability and water resistance and a method for producing the same are provided. An acrylic rubber bale, including an acrylic rubber having a reactive group, with a specific ash content, a large proportion of magnesium and phosphorus in the ash, and a specific ratio of magnesium and phosphorus, is highly excellent in storage stability and water resistance. This acrylic rubber bale can be produced by using a specific stabilizer and a specific coagulant in an emulsion polymerization process of an acrylic rubber and performing a process from coagulation process to baling process under specific conditions.

Acrylic rubber bale having remarkably improved storage stability and water resistance without deteriorating cross-linking properties, a method of production, a rubber mixture obtained by mixing the acrylic rubber bale, a method of production, and a rubber cross-linked product obtained by cross-linking the same is provided. The acrylic rubber bale includes an acrylic rubber, and the acrylic rubber is mainly composed of (meth) acrylic acid ester, and has a weight average molecular weight of 100,000 to 5,000,000, and has a ratio of a Z-average molecular weight and a weight average molecular weight of 1.3 or more, where an ash content is 0.6% by weight or less, and the ash contains a periodic table group 2 metal and phosphorus, and a phosphorus content is 10% by weight or more, and the ratio of the periodic table group 2 metal to phosphorus is in the range of 0.6 to 2 molar ratio.

Acrylic rubber bale having remarkably improved storage stability and water resistance without deteriorating cross-linking properties, a method of production, a rubber mixture obtained by mixing the acrylic rubber bale, a method of production, and a rubber cross-linked product obtained by cross-linking the same is provided. The acrylic rubber bale includes an acrylic rubber, and the acrylic rubber is mainly composed of (meth) acrylic acid ester, and has a weight average molecular weight of 100,000 to 5,000,000, and has a ratio of a Z-average molecular weight and a weight average molecular weight of 1.3 or more, where an ash content is 0.6% by weight or less, and the ash contains a periodic table group 2 metal and phosphorus, and a phosphorus content is 10% by weight or more, and the ratio of the periodic table group 2 metal to phosphorus is in the range of 0.6 to 2 molar ratio.

An acrylic rubber that is a copolymer in which 1 to 4 wt. % of a reactive halogen group-containing vinyl monomer is copolymerized as a crosslinkable comonomer, wherein 45 to 65 wt. % of n-butyl acrylate, 10 to 35 wt. % of 2-methoxyethyl acrylate and 8 to 30 wt. % of ethoxyethoxyethyl acrylate are copolymerized in 100 wt. % of comonomers other than the crosslinkable comonomer. This ethoxyethoxyethyl acrylate-copolymerized acrylic rubber can suppress the reduction of oil resistance while improving cold resistance represented by a TR-10 value, and by compounding it with a vulcanizing agent corresponding to the crosslinkable group thereof, a crosslinkable composition is formed.

An acrylic rubber that is a copolymer in which 1 to 4 wt. % of a reactive halogen group-containing vinyl monomer is copolymerized as a crosslinkable comonomer, wherein 45 to 65 wt. % of n-butyl acrylate, 10 to 35 wt. % of 2-methoxyethyl acrylate and 8 to 30 wt. % of ethoxyethoxyethyl acrylate are copolymerized in 100 wt. % of comonomers other than the crosslinkable comonomer. This ethoxyethoxyethyl acrylate-copolymerized acrylic rubber can suppress the reduction of oil resistance while improving cold resistance represented by a TR-10 value, and by compounding it with a vulcanizing agent corresponding to the crosslinkable group thereof, a crosslinkable composition is formed.

To provide a microchannel chip which is a chip provided internally with an inner space that can be used as a flow channel, and which is excellent in drug non-absorption properties of the channel. The microchannel chip has formed therein a plurality of openings H1, H2 and an inner space S connecting the plurality of openings H1, H2, and at least a part of the surface in contact with the inner space S is made of a fluorinated copolymer containing from 5 to 99 mol % of units based on CF.sub.2CFX (X is a fluorine atom, a chlorine atom or CF.sub.3).

To provide a microchannel chip which is a chip provided internally with an inner space that can be used as a flow channel, and which is excellent in drug non-absorption properties of the channel. The microchannel chip has formed therein a plurality of openings H1, H2 and an inner space S connecting the plurality of openings H1, H2, and at least a part of the surface in contact with the inner space S is made of a fluorinated copolymer containing from 5 to 99 mol % of units based on CF.sub.2CFX (X is a fluorine atom, a chlorine atom or CF.sub.3).

A compound represented by the formula (I).

##STR00001##

wherein R.sup.1 represents a hydrogen atom, a halogen atom or a C.sub.1 to C.sub.6 alkyl group that may have a halogen atom; R.sup.2 represents a C.sub.1 to C.sub.12 fluorinated saturated hydrocarbon group; W.sup.1 represents a C.sub.5 to C.sub.18 divalent alicyclic hydrocarbon group; A.sup.1 and A.sup.2 independently represents a single bond or *-A.sup.3-X.sup.1-(A.sup.4-X.sup.2).sub.a-; A.sup.3 and A.sup.4 independently represents a C.sub.1 to C.sub.6 alkanediyl group; X.sup.1 and X.sup.2 independently represents O, COO or OCO; a represents 0 or 1; and * represents a bond to an oxygen atom.