The present invention aims to provide an acrylic copolymer capable of maintaining excellent storage stability in the uncrosslinked state even after long-term exposure to high temperatures, and a crosslinked acrylic rubber product produced from the acrylic copolymer which maintains good normal-state properties and good water resistance. The present invention is based on the finding that an acrylic copolymer produced by polymerizing a liquid mixture of an alkoxyalkyl (meth)acrylate containing an alkoxyalkyl group and a crosslinkable monomer containing a carboxy group has excellent storage stability and that a crosslinked product produced from the acrylic copolymer has good normal-state properties and good water resistance.

The present invention aims to provide an acrylic copolymer capable of maintaining excellent storage stability in the uncrosslinked state even after long-term exposure to high temperatures, and a crosslinked acrylic rubber product produced from the acrylic copolymer which maintains good normal-state properties and good water resistance. The present invention is based on the finding that an acrylic copolymer produced by polymerizing a liquid mixture of an alkoxyalkyl (meth)acrylate containing an alkoxyalkyl group and a crosslinkable monomer containing a carboxy group has excellent storage stability and that a crosslinked product produced from the acrylic copolymer has good normal-state properties and good water resistance.

An adhesive sealant composition of at least one moisture-crosslinkable prepolymer and an anti-sagging agent of 5% to 30% by weight of a thixotropic composition of 10% to 40% by weight of a bisurea a) obtained by reaction of a primary aliphatic amine a1) with a diisocyanate a2) having a molar mass of less than 500 g/mol, and 60% to 90% by weight of an ester b) of formula (I): ##STR00001##
in which R.sup.1, R.sup.2 and R.sup.3 are an oxycarbonylalkyl radical having from 4 to 20 carbon atoms, R.sup.4 is hydrogen, methyl or ethyl or —CH.sub.2—R.sup.5 in which R.sup.5 is oxycarbonylalkyl having from 4 to 20 carbon atoms, in the form of a suspension of solid particles of bisurea a) in a continuous phase formed by ester b).

An adhesive sealant composition of at least one moisture-crosslinkable prepolymer and an anti-sagging agent of 5% to 30% by weight of a thixotropic composition of 10% to 40% by weight of a bisurea a) obtained by reaction of a primary aliphatic amine a1) with a diisocyanate a2) having a molar mass of less than 500 g/mol, and 60% to 90% by weight of an ester b) of formula (I): ##STR00001##
in which R.sup.1, R.sup.2 and R.sup.3 are an oxycarbonylalkyl radical having from 4 to 20 carbon atoms, R.sup.4 is hydrogen, methyl or ethyl or —CH.sub.2—R.sup.5 in which R.sup.5 is oxycarbonylalkyl having from 4 to 20 carbon atoms, in the form of a suspension of solid particles of bisurea a) in a continuous phase formed by ester b).

A cross-linkable nitrile rubber composition including a nitrile rubber (a) containing 0.1 to 15 wt % of α,β-ethylenically unsaturated nitrile monomer units, 1 to 10 wt % of α,β-ethylenically unsaturated dicarboxylic acid monoester monomer units, 40 to 75 wt % of α,β-ethylenically unsaturated monocarboxylic acid ester monomer units, and 20 to 58.9 wt % of diene monomer units and/or α-olefin monomer units, and a polyamine-based cross-linking agent (b), wherein a ratio of content of the polyamine-based cross-linking agent (b) with respect to 100 parts by weight of the nitrile rubber (a) is 0.1 to 20 parts by weight is provided.

A cross-linkable nitrile rubber composition including a nitrile rubber (a) containing 0.1 to 15 wt % of α,β-ethylenically unsaturated nitrile monomer units, 1 to 10 wt % of α,β-ethylenically unsaturated dicarboxylic acid monoester monomer units, 40 to 75 wt % of α,β-ethylenically unsaturated monocarboxylic acid ester monomer units, and 20 to 58.9 wt % of diene monomer units and/or α-olefin monomer units, and a polyamine-based cross-linking agent (b), wherein a ratio of content of the polyamine-based cross-linking agent (b) with respect to 100 parts by weight of the nitrile rubber (a) is 0.1 to 20 parts by weight is provided.

A cross-linked rubber obtained by cross-linking a nitrile rubber composition, wherein the nitrile rubber composition contains a carboxyl group-containing nitrile rubber (a) with an iodine value of 120 or less and a diurethane compound (b) represented by a following general formula (1), a content of the diurethane compound (b) in the nitrile rubber composition is 5 to 15 parts by weight with respect to 100 parts by weight of the carboxyl group-containing nitrile rubber (a), and a tensile strength of the cross-linked rubber based on JIS K6251 is 15 MPa or more and an elongation at break of the cross-linked rubber based on JIS K6251 is 300% or more, is provided.

##STR00001##

The invention relates to mixtures containing at least one aminically crosslinkable rubber and a cross-linking system, which consists of at least one crosslinker and optionally at least one vulcanization accelerator, the at least one crosslinker containing polyethylene imine. The invention further relates to the production and to the use of said mixtures; and to the vulcanized products that can be obtained from the mixture, in particular in the form of rubber articles, in particular seals, hoses, membranes and o-rings.

The invention relates to mixtures containing at least one aminically crosslinkable rubber and a cross-linking system, which consists of at least one crosslinker and optionally at least one vulcanization accelerator, the at least one crosslinker containing polyethylene imine. The invention further relates to the production and to the use of said mixtures; and to the vulcanized products that can be obtained from the mixture, in particular in the form of rubber articles, in particular seals, hoses, membranes and o-rings.

A purge control solenoid valve includes a gas access body including an evaporation gas inlet, an evaporation gas outlet, and a path that connects the evaporation gas inlet and the evaporation gas outlet; a valve operation body including an armature coupled to the gas access body and performing a reciprocating motion in a direction in which the armature is brought into close contact with or separated from the path by a core that generates a magnetic force; and an armature top member being in close contact with or separated from the path due to the reciprocating motion of the armature to open or close the path. The armature top member has a non-adhesion coating formed on a top surface of a body thereof, and the non-adhesion coating includes a binder, graphite, polytetrafluoroethylene, and a crosslinking agent.